WLS Codebooks

Note: Codebooks contain frequency data from the private data release. For some variables, these differ from the frequencies in the public release. Variables that differ between the public and private versions include "(not available on public release)" as part of the variable description, or a note indicating the difference between the public and private versions.

Cognition - Letter Fluency

O1COGFLU  Cognition - Letter Fluency Module           

OVERVIEW

The Cognition - Letter Fluency Module, which was first administered during the
2004 collection wave, tests cognitive ability by asking the participant to name
as many items that fit specified parameters as they can within 60-second
intervals. The "Letter Fluency," was administered to all participants and
called for them to think of and say as many words as they could that began with
a particular, randomly selected letter of the alphabet: "L" or "F". Prior to
attempting the task, participants were instructed not to use proper names (of
people or places), say the same word more than once, or to repeat variants of
the same root word with different endings. For the Letter Fluency task, the
number of acceptable responses given by the participant - as well as the
frequency with which they violated the stated rules - was tallied by 15-second
quartiles during our transcription process. 

If the participant refused to grant their interviewer permission to record the
entire CAPI interview at its beginning, they were asked for special permission
to record just the Cognition - Letter Fluency Module. If such permission was
denied, the module was skipped in its entirety, as it was not possible to
properly transcribe and score the task mid-interview. 


IMPORTANT NOTE: The ILIAD Letter Fluency module is transcribed and scored using
the same process as both the 2004 and 2011 rounds of data collection.

BRIEF VARIABLE DESCRIPTIONS

    Variable ranges reference dataset/codebook order and are not necessarily 
    alphabetical.
    _____________________________________________________________________

    
    o1i202rec-o1i205rec:       Administrative and Error Codes for the 
                               Letter Fluency Task 
                               
    o1i206re:                  Version of Letter Fluency Task Administered:
                               "L" or "F"

    o1i210rec:                 Total Letter Fluency Score as Sum of Scored
                               Words Named
                               
    o1i211rec-o1i216rec:       Counts of the Disqualified Words Said for 
                               the Letter Fluency Task: Repeated Words,
                               Same Root Word with Different Endings, 
                               Caught Repetitions, Proper Nouns, and 
                               Incorrect Responses

    o1i220rec-o1i247rec:       Letter Fluency Scores and Counts of the 
                               Disqualified Words Said by 15-Second 
                               Quartiles

o1i202rec: Detailed code for Letter Fluency not ascertained.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: x_irecprm1, x_i11b1, x_i11bstrt

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-2 677 849 1526
1 MISSING OR TOO POOR AUDIO RECORDING 18 7 25
8 MISHEARD LETTER, NOT PROPERLY CORRECTED 4 4 8
Note: Cases are assigned values of "-4" and coded as not ascertained on o1i210rec-o1i247rec for any of the detailed reasons contained within this variable. See "cor860FluencyCodingSupervisorInstructions.doc" in Appendix G for the specifics on what rules were followed to determine which detailed code was given.

o1i203rec: Detailed code for Letter Fluency refused.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: x_irecprm1, x_i11b1, x_i11bstrt

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-2 682 843 1525
1 REFUSAL BEFORE TASK BEGAN 4 2 6
2 REFUSAL DURING ADMINISTRATION OF TASK 13 15 28
Note: Cases are assigned values of "-3" and coded as refusals on o1i210rec-o1i247rec for any of the detailed reasons contained within this variable. For more information on how the Letter Fluency task was transcribed and scored, see cor860 in Appendix G.

o1i204rec: Detailed code for Letter Fluency cautions.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: x_irecprm1, x_i11b1, x_i11bstrt

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-2 699 860 1559
Note: See "cor860FluencyCodingSupervisorInstructions.doc" in Appendix G for the specifics on what rules were followed to determine which detailed code was given.

o1i205rec: Duration of Letter Fluency task for Participants who stopped before 60 seconds had elapsed.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-2 613 762 1375
4 - 45 16 24 40
46 - 48 17 20 37
49 - 51 21 18 39
52 - 55 21 23 44
56 - 59 11 13 24
Note: Some participants who did not refuse assessment and to whom the Letter Fluency task was appropriately administered decided to stop or quit before the full 60 seconds allotted to them had elapsed; all such participants should have valid data on variables o1i210rec-o1i247rec. Participants to whom the Letter Fluency task was not appropriately administered (see o1i202rec) or who refused to be assessed (see o1i203rec) have been assigned values of "-3" or "-4" on variables o1i210rec-o1i247rec. For more information on how the Letter Fluency task was transcribed and scored, see cor860 in Appendix G.

o1i206re: Version of Letter Fluency task, 'F' or 'L'.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: p_ForL

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
1 F 333 421 754
2 L 366 439 805
Note: Unlike during the 2005 collection wave, when the Letter Fluency task was only administered to a randomly selected 80% sub-sample, all participants were asked to complete it in 2011. Participants who attempted the task in 2005 were asked to complete it in 2011 using the same letter ("L" or "F") that was randomly assigned to them last wave. Participants attempting the task for the first time in 2011 had either "L" or "F" randomly assigned to them. The Letter Fluency task was not administered to participants who did not permit audio recording of the Cognition - Letter/Category Fluency Module (see o1i202rec); in such cases, no letter was randomly assigned.

o1i210rec: Letter Fluency: Total number of scored words named.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 - 8 183 157 340
9 - 11 180 222 402
12 - 14 147 222 369
15 - 19 122 182 304
20 - 29 28 49 77
Note: This variable provides a sum of the scored words said by the participant after all Letter Fluency coding rules were implemented and any disqualified words were removed from consideration (see o1i211rec). For more detail on participants to whom the Letter Fluency task was not appropriately administered (codes of "-4") or who refused to be assessed (codes of "-3"), please see o1i202rec and o1i203rec respectively. For information on how the Letter Fluency task was transcribed and scored, see cor860 in Appendix G.

o1i211rec: Letter Fluency: Total raw number of words said, both those that were scored and those that were disqualified.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec x

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 - 9 191 171 362
10 - 12 166 198 364
13 - 15 141 219 360
16 - 20 127 191 318
21 - 31 35 53 88
Note: See cor860 in Appendix G for information on how the Letter Fluency task was transcribed and scored. For more detail on participants to whom the Letter Fluency task was not appropriately administered (codes of "-4") or who refused to be assessed (codes of "-3"), please see o1i202rec and o1i203rec respectively.

o1i212rec: Letter Fluency: Total number of exactly repeated words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 363 454 817
1 179 227 406
2 65 96 161
3 36 33 69
4 8 10 18
5 4 5 9
6 3 5 8
7 1 2 3
8 1 0 1
Note: Participants were instructed not to repeat words when attempting the Letter Fluency task. For more detail on participants to whom the Letter Fluency task was not appropriately administered (codes of "-4") or who refused to be assessed (codes of "-3"), please see o1i202rec and o1i203rec respectively. For information on how the Letter Fluency task was transcribed and scored, see cor860 in Appendix G.

o1i213rec: Letter Fluency: Total number of repeated root words with different endings.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 594 721 1315
1 60 94 154
2 3 15 18
3 2 1 3
4 0 1 1
5 1 0 1
Note: Participants were instructed not to say any of the same words with a different ending when attempting the Letter Fluency task; an example of the same root word with a different ending would be "love" and "loving". For more detail on participants to whom the Letter Fluency task was not appropriately administered (codes of "-4") or who refused to be assessed (codes of "-3"), please see o1i202rec and o1i203rec respectively. For information on how the Letter Fluency task was transcribed and scored, see cor860 in Appendix G.

o1i214rec: Letter Fluency: Total number of repeated words caught by Participant.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 621 762 1383
1 37 65 102
2 2 5 7
Note: A participant was considered to have caught an exactly repeated word (see o1i212rec), or a repetition of the same root word with a different ending (see o1i213rec), if they said something to the effect of, "oh, I already said that" during their timed attempt of the Letter Fluency task. For more detail on participants to whom the Letter Fluency task was not appropriately administered (codes of "-4") or who refused to be assessed (codes of "-3"), please see o1i202rec and o1i203rec respectively. For information on how the Letter Fluency task was transcribed and scored, see cor860 in Appendix G.

o1i215rec: Letter Fluency: Total number of proper nouns.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 524 711 1235
1 97 99 196
2 30 20 50
3 4 1 5
4 3 1 4
5 1 0 1
6 1 0 1
Note: Participants were instructed not to use proper names of people or places (e.g. "France" or "Fred") when attempting the Letter Fluency task. For more detail on participants to whom the Letter Fluency task was not appropriately administered (codes of "-4") or who refused to be assessed (codes of "-3"), please see o1i202rec and o1i203rec respectively. For information on how the Letter Fluency task was transcribed and scored, see cor860 in Appendix G.

o1i216rec: Letter Fluency: Total number of incorrect words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 642 801 1443
1 15 25 40
2 1 4 5
3 1 0 1
4 1 0 1
8 0 1 1
10 0 1 1
Note: An "incorrect" word is one that falls outside of the specified parameters for the Letter Fluency task: to say words that begin with a particular letter of the alphabet, "L" or "F". For a participant asked to think of words that begin with the letter "F", the words "phoenix" and "mouse" would constitute incorrect responses. For more detail on participants to whom the Letter Fluency task was not appropriately administered (codes of "-4") or who refused to be assessed (codes of "-3"), please see o1i202rec and o1i203rec respectively. For information on how the Letter Fluency task was transcribed and scored, see cor860 in Appendix G.

o1i220rec: Letter Fluency, Quartile 1: Total number of scored words named.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 5 6 11
1 15 11 26
2 40 27 67
3 71 73 144
4 140 130 270
5 121 179 300
6 129 180 309
7 87 117 204
8 36 70 106
9 12 25 37
10 3 6 9
11 0 4 4
12 1 4 5
Note: Quartile #1 comprises the first 15 seconds of the Letter Fluency task's 60-second administration period; this variable, then, provides a sum of the scored words said by the participant during quartile #1 after all Letter Fluency coding rules were implemented and any disqualified words were removed from consideration (see o1i221rec). For more information on how the task was transcribed and scored, see cor860 in Appendix G.

o1i221rec: Letter Fluency, Quartile 1: Total raw number of words said, both those that were scored and those that were disqualified.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 4 5 9
1 10 9 19
2 27 22 49
3 68 66 134
4 129 118 247
5 133 178 311
6 131 189 320
7 95 118 213
8 40 75 115
9 19 36 55
10 3 8 11
11 0 4 4
12 1 4 5
Note: Quartile #1 comprises the first 15 seconds of the Letter Fluency task's 60-second administration period. See cor860 in Appendix G for more information on how the task was transcribed and scored.

o1i222rec: Letter Fluency, Quartile 1: Total number of exactly repeated words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 620 777 1397
1 37 49 86
2 3 6 9
Note: Quartile #1 comprises the first 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to repeat words when attempting it; for more information on transcription and scoring, see cor860 in Appendix G.

o1i223rec: Letter Fluency, Quartile 1: Total number of repeated root words with different endings.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 646 801 1447
1 13 30 43
2 1 1 2
Note: Quartile #1 comprises the first 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to say any of the same words with a different ending when attempting it; an example of the same root word with a different ending would be "love" and "loving". For more information on transcription and scoring, see cor860 in Appendix G.

o1i224rec: Letter Fluency, Quartile 1: Total number of repeated words caught by Participant.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 658 829 1487
1 2 3 5
Note: Quartile #1 comprises the first 15 seconds of the Letter Fluency task's 60-second administration period. A participant was considered to have caught an exactly repeated word (see o1i222rec), or a repetition of the same root word with a different ending (see o1i223rec), if they said something to the effect of, "oh, I already said that" during their timed attempt of the task. For more information on transcription and scoring, see cor860 in Appendix G.

o1i225rec: Letter Fluency, Quartile 1: Total number of proper nouns.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 586 773 1359
1 60 54 114
2 13 4 17
3 1 1 2
Note: Quartile #1 comprises the first 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to use proper names of people or places (e.g. "France" or "Fred") when attempting it; for more information on transcription and scoring, see cor860 in Appendix G.

o1i226rec: Letter Fluency, Quartile 1: Total number of incorrect words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 655 826 1481
1 4 5 9
2 1 1 2
Note: Quartile #1 comprises the first 15 seconds of the Letter Fluency task's 60-second administration period. An "incorrect" word is one that falls outside of the specified parameters for the task: to say words that begin with a particular letter of the alphabet, "L" or "F". For a participant asked to think of words that begin with the letter "F", the words "phoenix" and "mouse" would constitute incorrect responses. For more information on transcription and scoring, see cor860 in Appendix G.

o1i227rec: Letter Fluency, Quartile 2: Total number of scored words named.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 48 53 101
1 139 114 253
2 143 182 325
3 139 204 343
4 93 141 234
5 68 93 161
6 24 29 53
7 2 15 17
8 4 1 5
Note: Quartile #2 comprises the second 15 seconds of the Letter Fluency task's 60-second administration period; this variable, then, provides a sum of the scored words said by the participant during quartile #2 after all Letter Fluency coding rules were implemented and any disqualified words were removed from consideration (see o1i228rec). For more information on how the task was transcribed and scored, see cor860 in Appendix G.

o1i228rec: Letter Fluency, Quartile 2: Total raw number of words said, both those that were scored and those that were disqualified.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 35 37 72
1 103 97 200
2 140 161 301
3 144 198 342
4 108 162 270
5 80 108 188
6 36 51 87
7 9 17 26
8 4 1 5
9 1 0 1
Note: Quartile #2 comprises the second 15 seconds of the Letter Fluency task's 60-second administration period. See cor860 in Appendix G for more information on how the task was transcribed and scored.

o1i229rec: Letter Fluency, Quartile 2: Total number of exactly repeated words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 540 695 1235
1 92 115 207
2 26 16 42
3 1 6 7
4 1 0 1
Note: Quartile #2 comprises the second 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to repeat words when attempting it; for more information on transcription and scoring, see cor860 in Appendix G.

o1i230rec: Letter Fluency, Quartile 2: Total number of repeated root words with different endings.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 634 800 1434
1 25 29 54
2 1 3 4
Note: Quartile #2 comprises the second 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to say any of the same words with a different ending when attempting it; an example of the same root word with a different ending would be "love" and "loving". For more information on transcription and scoring, see cor860 in Appendix G.

o1i231rec: Letter Fluency, Quartile 2: Total number of repeated words caught by Participant.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 647 813 1460
1 13 19 32
Note: Quartile #2 comprises the second 15 seconds of the Letter Fluency task's 60-second administration period. A participant was considered to have caught an exactly repeated word (see o1i229rec), or a repetition of the same root word with a different ending (see o1i230rec), if they said something to the effect of, "oh, I already said that" during their timed attempt of the task. For more information on transcription and scoring, see cor860 in Appendix G.

o1i232rec: Letter Fluency, Quartile 2: Total number of proper nouns.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 616 803 1419
1 40 26 66
2 2 3 5
3 2 0 2
Note: Quartile #2 comprises the second 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to use proper names of people or places (e.g. "France" or "Fred") when attempting it; for more information on transcription and scoring, see cor860 in Appendix G.

o1i233rec: Letter Fluency, Quartile 2: Total number of incorrect words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 655 823 1478
1 4 7 11
2 1 1 2
4 0 1 1
Note: Quartile #2 comprises the second 15 seconds of the Letter Fluency task's 60-second administration period. An "incorrect" word is one that falls outside of the specified parameters for the task: to say words that begin with a particular letter of the alphabet, "L" or "F". For a participant asked to think of words that begin with the letter "F", the words "phoenix" and "mouse" would constitute incorrect responses. For more information on transcription and scoring, see cor860 in Appendix G.

o1i234rec: Letter Fluency, Quartile 3: Total number of scored words named.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 105 109 214
1 147 181 328
2 151 228 379
3 154 168 322
4 61 94 155
5 31 40 71
6 7 10 17
7 4 1 5
8 0 1 1
Note: Quartile #3 comprises the third 15 seconds of the Letter Fluency task's 60-second administration period; this variable, then, provides a sum of the scored words said by the participant during quartile #3 after all Letter Fluency coding rules were implemented and any disqualified words were removed from consideration (see o1i235rec). For more information on how the task was transcribed and scored, see cor860 in Appendix G.

o1i235rec: Letter Fluency, Quartile 3: Total raw number of words said, both those that were scored and those that were disqualified.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 90 77 167
1 117 149 266
2 144 209 353
3 165 188 353
4 77 129 206
5 51 61 112
6 11 15 26
7 4 3 7
8 1 1 2
Note: Quartile #3 comprises the third 15 seconds of the Letter Fluency task's 60-second administration period. See cor860 in Appendix G for more information on how the task was transcribed and scored.

o1i236rec: Letter Fluency, Quartile 3: Total number of exactly repeated words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 537 660 1197
1 99 139 238
2 21 25 46
3 1 6 7
4 2 1 3
5 0 1 1
Note: Quartile #3 comprises the third 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to repeat words when attempting it; for more information on transcription and scoring, see cor860 in Appendix G.

o1i237rec: Letter Fluency, Quartile 3: Total number of repeated root words with different endings.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 647 803 1450
1 11 28 39
2 1 1 2
3 1 0 1
Note: Quartile #3 comprises the third 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to say any of the same words with a different ending when attempting it; an example of the same root word with a different ending would be "love" and "loving". For more information on transcription and scoring, see cor860 in Appendix G.

o1i238rec: Letter Fluency, Quartile 3: Total number of repeated words caught by Participant.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 654 807 1461
1 5 25 30
2 1 0 1
Note: Quartile #3 comprises the third 15 seconds of the Letter Fluency task's 60-second administration period. A participant was considered to have caught an exactly repeated word (see o1i236rec), or a repetition of the same root word with a different ending (see o1i237rec), if they said something to the effect of, "oh, I already said that" during their timed attempt of the task. For more information on transcription and scoring, see cor860 in Appendix G.

o1i239rec: Letter Fluency, Quartile 3: Total number of proper nouns.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 635 809 1444
1 23 22 45
2 2 1 3
Note: Quartile #3 comprises the third 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to use proper names of people or places (e.g. "France" or "Fred") when attempting it; for more information on transcription and scoring, see cor860 in Appendix G.

o1i240rec: Letter Fluency, Quartile 3: Total number of incorrect words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 653 824 1477
1 6 5 11
2 0 2 2
3 1 0 1
4 0 1 1
Note: Quartile #3 comprises the third 15 seconds of the Letter Fluency task's 60-second administration period. An "incorrect" word is one that falls outside of the specified parameters for the task: to say words that begin with a particular letter of the alphabet, "L" or "F". For a participant asked to think of words that begin with the letter "F", the words "phoenix" and "mouse" would constitute incorrect responses. For more information on transcription and scoring, see cor860 in Appendix G.

o1i241rec: Letter Fluency, Quartile 4: Total number of scored words named.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 180 183 363
1 190 215 405
2 152 231 383
3 78 126 204
4 37 50 87
5 14 17 31
6 6 7 13
7 2 3 5
8 1 0 1
Note: Quartile #4 comprises the fourth 15 seconds of the Letter Fluency task's 60-second administration period; this variable, then, provides a sum of the scored words said by the participant during quartile #4 after all Letter Fluency coding rules were implemented and any disqualified words were removed from consideration (see o1i242rec). For more information on how the task was transcribed and scored, see cor860 in Appendix G.

o1i242rec: Letter Fluency, Quartile 4: Total raw number of words said, both those that were scored and those that were disqualified.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 135 150 285
1 178 181 359
2 160 231 391
3 99 141 240
4 52 74 126
5 22 41 63
6 11 10 21
7 2 4 6
8 1 0 1
Note: Quartile #4 comprises the fourth 15 seconds of the Letter Fluency task's 60-second administration period. See cor860 in Appendix G for more information on how the task was transcribed and scored.

o1i243rec: Letter Fluency, Quartile 4: Total number of exactly repeated words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 533 678 1211
1 103 128 231
2 20 22 42
3 3 3 6
4 1 1 2
Note: Quartile #4 comprises the fourth 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to repeat words when attempting it; for more information on transcription and scoring, see cor860 in Appendix G.

o1i244rec: Letter Fluency, Quartile 4: Total number of repeated root words with different endings.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 643 798 1441
1 15 34 49
2 2 0 2
Note: Quartile #4 comprises the fourth 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to say any of the same words with a different ending when attempting it; an example of the same root word with a different ending would be "love" and "loving". For more information on transcription and scoring, see cor860 in Appendix G.

o1i245rec: Letter Fluency, Quartile 4: Total number of repeated words caught by Participant.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 641 806 1447
1 19 24 43
2 0 2 2
Note: Quartile #4 comprises the fourth 15 seconds of the Letter Fluency task's 60-second administration period. A participant was considered to have caught an exactly repeated word (see o1i243rec), or a repetition of the same root word with a different ending (see o1i244rec), if they said something to the effect of, "oh, I already said that" during their timed attempt of the task. For more information on transcription and scoring, see cor860 in Appendix G.

o1i246rec: Letter Fluency, Quartile 4: Total number of proper nouns.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 639 808 1447
1 18 23 41
2 2 1 3
4 1 0 1
Note: Quartile #4 comprises the fourth 15 seconds of the Letter Fluency task's 60-second administration period. Participants were instructed not to use proper names of people or places (e.g. "France" or "Fred") when attempting it; for more information on transcription and scoring, see cor860 in Appendix G.

o1i247rec: Letter Fluency, Quartile 4: Total number of incorrect words.

Data source: Sibling Respondent      Collected in: 2020      Mode: In person & telephone
Source variables: o1i202rec, o1i203rec, x_i11b1

Frequencies
Value Label Male Female Total
. System missing - NR 3738 3481 7219
-4 NOT ASCERTAINED 22 11 33
-3 REFUSED 17 17 34
0 657 819 1476
1 3 10 13
2 0 2 2
4 0 1 1
Note: Quartile #4 comprises the fourth 15 seconds of the Letter Fluency task's 60-second administration period. An "incorrect" word is one that falls outside of the specified parameters for the task: to say words that begin with a particular letter of the alphabet, "L" or "F". For a participant asked to think of words that begin with the letter "F", the words "phoenix" and "mouse" would constitute incorrect responses. For more information on transcription and scoring, see cor860 in Appendix G.

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