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.

In Person: Anesthesia History

JANESTH  Anesthesia History Module

OVERVIEW

The Anesthesia History Module is new to the 2011 collection wave and addresses
surgeries or medical procedures the participant has received that required
anesthesia. Information was collected from selected participants as follows:
     
     All participants who - in the Health Module - reported ever undergoing 
     heart surgery were asked to specify the timing and type of their most 
     recent procedure; then, they were asked about their interest in being 
     contacted for future study of how procedures involving anesthesia may
     affect later health. If the participant did not report having ever 
     received heart surgery but belonged to a randomly selected 25% 
     sub-sample, they were asked about the timing and type of their three
     most recent medical procedures that required anesthesia, as applicable.
     Like peers who reported undergoing heart surgery, participants who 
     reported having other surgeries that required anesthesia were also 
     asked about their interest in being contacted for future study.
     
Users should note that no attempt was made to code participants' responses to
questions about medical procedure type; we will, however, make their answers
available upon request.


BRIEF VARIABLE DESCRIPTIONS

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

    HANESTAT-HANEREL:	    Module-Level Status Variables
   
    HX585REA-HX586RE:	    Timing and Type of Heart Surgery Most 
    			    Recently Undergone by Participant
    
    HX584RE:		    Summary of Whether Participant was Eligible
    			    to be Asked About Undergoing Medical 
    			    Procedures that Required Anesthesia
   
    HX587RE-HX595RE:	    Timing and Type of Participant's Three Most
    			    Recent Surgeries that Required Anesthesia
    			    
    HX596RE:		    Participant's Willingness to be Contacted 
    			    in the Future for Parts of the Study 
    			    Examining How Procedures Involving 
    			    Anesthesia May Affect Later Health

hanestat: Was the Anesthesia History Module completed by Participant alone, with help, or by proxy?

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: y_x1a5g, y_fluflag, y_r131, y_aneproxy1, y_anehelp0, capiproxy, y_proxy, y_ivwloc

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	9	8	17
-2	Inappropriate Inap, not in sample (y_x1a5g != 1 and (y_fluflag != 1 or (y_fluflag = 1 and y_r131 != 9999 and y_r131 >= 5049)))	1759	2266	4025
1	R COMPLETED ALONE	870	852	1722
2	R COMPLETED ALONE WITH SOMEONE ELSE IN THE ROOM	86	44	130
3	R RECEIVED A LITTLE HELP	49	18	67
4	R RECEIVED A LOT OF HELP	3	2	5
5	HELPER RESPONDED TO ALL ITEMS	1	1	2

Note: For many cases a participant's spouse or other family member was present during the interview. This sometimes resulted in the participant relying on the other person for help in answering some or many of the questions. At the end of each module the interviewer indicated the amount of help the participant received and who provided that help. That assessment is covered by codes 1 through 5. Additionally, a code of 7 indicates that the entire interview was administered to a proxy while a code of 6 indicates that this particular module was answered by a proxy but other modules were answered by the participant.

hanerel: Relationship of Anesthesia History Module helper or proxy to Participant.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hanestat, y_aneproxy1, y_anehelp0, y_anehelp1, y_anehelp2_hfn, y_anehelp3, y_h1fn-y_h4fn, y_pfn, prxyfnam, y_p1fn-y_p5fn, y_prel, prxyrel, y_p1rel-y_p5rel

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	9	8	17
-2	Inappropriate Inap, not in sample (y_x1a5g != 1 and (y_fluflag != 1 or (y_fluflag = 1 and y_r131 != 9999 and y_r131 >= 5049))) or hanestat=1,2,-3	2715	3162	5877
0	SPOUSE	49	13	62
7	CARETAKER	1	0	1
8	DAUGHTER	0	3	3
25	FRIEND	1	1	2
26	GRANDDAUGHTER	1	0	1
39	NEPHEW	0	1	1
48	SON	1	2	3
54	OTHER	0	1	1

Note: If this module was administered via proxy or if the participant received help answering the questions in this module then we record the relationship of the proxy/helper to the participant. Although most participants relied on only one helper or proxy for the interview, some had more than one. Thus the value of the relationship code may vary across the modules.

hx585rea: Month in which Participant underwent their most recent heart surgery.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx355re, hx394re, y_anhrt_m_a

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	6	2	8
-4	NOT ASCERTAINED	347	129	476
-2	INAPPROPRIATE INAPPROPRIATE (HX355RE != 1)	2340	3021	5361
-1	DON'T KNOW	10	2	12
1	January	6	3	9
2	February	4	3	7
3	March	7	2	9
4	April	5	2	7
5	May	5	3	8
6	June	8	3	11
7	July	13	2	15
8	August	4	4	8
9	September	5	5	10
10	October	5	3	8
11	November	7	2	9
12	December	5	5	10

Note: Participants were only asked to provide the month or season in which their most recent heart surgery occurred if they reported multiple heart surgeries in the Health Module (see HX394RE); for participants who have only had one heart surgery, the month or season in which the surgery occurred was never collected and this variable has been assigned a value of "-4."

hx585reb: Year in which Participant underwent their most recent heart surgery.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx355re, hx394re, hx393re, y_anhrt_m_b

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	6	2	8
-2	INAPPROPRIATE INAPPROPRIATE (HX355RE != 1)	2340	3021	5361
-1	DON'T KNOW	0	1	1
1954 - 1996		99	22	121
1997 - 2002		90	32	122
2003 - 2006		100	43	143
2007 - 2009		98	49	147
2010 - 2012		44	21	65

hx585rec: Season in which Participant underwent their most recent heart surgery.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx355re, hx394re, hx585rea, y_anhrt_m_c

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	6	2	8
-4	NOT ASCERTAINED	347	129	476
-2	Inappropriate INAPPROPRIATE (HX355RE != 1 \| 0 < HX585REA)	2414	3058	5472
-1	DON'T KNOW	0	1	1
1	Winter	3	1	4
2	Spring	1	0	1
3	Summer	3	0	3
4	Fall	3	0	3

hx585red: Participant's age at the time of their most recent heart surgery.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx355re, hx394re, hx585reb, y_BRTHYR, y_anhrt_m_d

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	6	2	8
-4	NOT ASCERTAINED	0	1	1
-2	INAPPROPRIATE INAPPROPRIATE (HX355RE != 1)	2340	3021	5361
16 - 58		106	25	131
59 - 64		103	34	137
65 - 68		99	54	153
69 - 71		104	45	149
72 - 73		19	9	28

Note: Participants were only explicitly asked to provide their age at the time of surgery if they did not know or refused to supply the year in which the surgery occurred (see HX585REB); for participants who provided a valid year, age at the time of surgery was estimated by subtracting their birth year from it.

hx586re: Summary of how Participant responded when asked to specify the kind of heart procedure they most recently underwent.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx355re, y_anheart2

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	6	2	8
-2	INAPPROPRIATE INAPPROPRIATE (HX355RE != 1)	2340	3021	5361
1	DESCRIBED OR NAMED MEDICAL PROCEDURE	431	168	599

Note: No attempt was made to code participants' responses to questions about medical procedure type. We will make the descriptions referenced by this variable (code "1") available to interested users upon request.

hx584re: Summary of whether Participant was eligible to be asked about undergoing medical procedures that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx355re, y_fluflag, y_r131

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
1	ELIGIBLE, IN 25% SUB-SAMPLE AND DID NOT REPORT HAVING HEART SURGERY	581	755	1336
2	NOT ELIGIBLE, IN 25% SUB-SAMPLE BUT REPORTED HAVING HEART SURGERY	115	32	147
3	NOT ELIGIBLE, NOT IN 25% SUB-SAMPLE	2081	2404	4485

Note: Participants were eligible to be asked about undergoing medical procedures that required anesthesia if they belonged to a randomly selected 25% sub-sample and did not report ever having heart surgery when asked in the Health Module (see HX355RE). It was our intention to administer the anesthesia history questions to all eligible participants.

hx587re: Has Participant ever had any procedure or surgery that required anesthesia?

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx584re, y_an1b

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-3	REFUSED	1	0	1
-2	INAPPROPRIATE INAPPROPRIATE (HX584RE != 1)	2196	2436	4632
-1	DON'T KNOW	2	3	5
1	YES	519	704	1223
2	NO	56	42	98

Note: Participants were informed that relevant procedures would entail "care given by an anesthesiologist in addition to the surgeon."

hx588rea: Month in which Participant underwent their most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2a_a

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1)	2255	2481	4736
-1	DON'T KNOW	120	133	253
1	January	31	59	90
2	February	38	59	97
3	March	37	52	89
4	April	25	43	68
5	May	37	51	88
6	June	43	47	90
7	July	33	42	75
8	August	25	36	61
9	September	29	35	64
10	October	31	70	101
11	November	37	35	72
12	December	33	42	75

hx588reb: Year in which Participant underwent their most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2a_b

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1)	2255	2481	4736
-1	DON'T KNOW	14	25	39
1941 - 1996		84	162	246
1997 - 2005		118	139	257
2006 - 2008		125	161	286
2009 - 2010		139	166	305
2011 - 2012		39	51	90

hx588rec: Season in which Participant underwent their most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, hx588rea, y_an2a_c

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-4	NOT ASCERTAINED	1	0	1
-2	Inappropriate INAPPROPRIATE (HX587RE != 1 \| 0 < HX588REA)	2654	3052	5706
-1	DON'T KNOW	39	40	79
1	Winter	13	14	27
2	Spring	24	25	49
3	Summer	27	22	49
4	Fall	16	32	48

Note: Participants were only asked to provide the season in which they most recently underwent a surgery that required anesthesia if they did not know or refused to supply the month in which it occurred (see HX588REA).

hx588red: Participant's age at the time of their most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, hx588reb, y_BRTHYR, y_an2a_d

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1)	2255	2481	4736
-1	DON'T KNOW	2	7	9
2 - 56		88	164	252
57 - 66		121	149	270
67 - 69		126	167	293
70 - 71		136	156	292
72 - 74		46	61	107

Note: Participants were only explicitly asked to provide their age at the time of surgery if they did not know or refused to supply the year in which the surgery occurred (see HX588REB); for participants who provided a valid year, age at the time of surgery was estimated by subtracting their birth year from it.

hx589re: Summary of how Participant responded when asked to specify the kind of anesthesia-requiring procedure they most recently underwent.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2b

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-3	REFUSED	1	0	1
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1)	2255	2481	4736
1	DESCRIBED OR NAMED MEDICAL PROCEDURE	518	704	1222

hx591rea: Month in which Participant underwent their second most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e, y_an2a_2_a

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-3	REFUSED	0	1	1
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1 \| NO 2ND SURGERY REPORTED)	2409	2650	5059
-1	DON'T KNOW	135	179	314
1	January	16	26	42
2	February	21	30	51
3	March	15	23	38
4	April	21	29	50
5	May	24	28	52
6	June	28	39	67
7	July	14	39	53
8	August	19	32	51
9	September	18	26	44
10	October	18	43	61
11	November	18	20	38
12	December	18	20	38

hx591reb: Year in which Participant underwent their second most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e, y_an2a_2_b

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1 \| NO 2ND SURGERY REPORTED)	2409	2650	5059
-1	DON'T KNOW	15	41	56
1940 - 1974		64	105	169
1975 - 1992		63	111	174
1993 - 2002		77	96	173
2003 - 2007		82	107	189
2008 - 2012		64	75	139

hx591rec: Season in which Participant underwent their second most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e, hx591rea, y_an2a_2_c

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-3	REFUSED	1	1	2
-2	Inappropriate INAPPROPRIATE (HX587RE != 1 \| 0 < HX591REA \| NO 2ND SURGERY REPORTED)	2639	3005	5644
-1	DON'T KNOW	52	70	122
1	Winter	15	17	32
2	Spring	24	30	54
3	Summer	26	34	60
4	Fall	17	28	45

Note: Participants were only asked to provide the season in which they second most recently underwent a surgery that required anesthesia if they did not know or refused to supply the month in which it occurred (see HX591REA).

hx591red: Participant's age at the time of their second most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e, hx591reb, y_BRTHYR, y_an2a_2_d

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1 \| NO 2ND SURGERY REPORTED)	2409	2650	5059
-1	DON'T KNOW	6	19	25
1 - 34		67	111	178
35 - 52		62	117	179
53 - 63		80	103	183
64 - 68		86	107	193
69 - 74		64	78	142

Note: Participants were only explicitly asked to provide their age at the time of surgery if they did not know or refused to supply the year in which the surgery occurred (see HX591REB); for participants who provided a valid year, age at the time of surgery was estimated by subtracting their birth year from it.

hx592re: Summary of how Participant responded when asked to specify the kind of anesthesia-requiring procedure they second most recently underwent.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e, y_an2b_2

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-3	REFUSED	0	1	1
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1 \| NO 2ND PROCEDURE REPORTED)	2409	2650	5059
-1	DON'T KNOW	2	0	2
1	DESCRIBED OR NAMED MEDICAL PROCEDURE	363	534	897

hx594rea: Month in which Participant underwent their third most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e_2, y_an2a_3_a

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-3	REFUSED	0	1	1
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1 \| NO 3RD SURGERY REPORTED)	2534	2805	5339
-1	DON'T KNOW	112	158	270
1	January	7	20	27
2	February	8	16	24
3	March	12	17	29
4	April	7	18	25
5	May	12	25	37
6	June	15	20	35
7	July	10	16	26
8	August	15	17	32
9	September	12	15	27
10	October	11	22	33
11	November	11	24	35
12	December	8	11	19

hx594reb: Year in which Participant underwent their third most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e_2, y_an2a_3_b

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1 \| NO 3RD SURGERY REPORTED)	2534	2805	5339
-1	DON'T KNOW	19	31	50
1939 - 1964		48	73	121
1965 - 1981		31	87	118
1982 - 1996		47	67	114
1997 - 2004		53	68	121
2005 - 2012		42	54	96

hx594rec: Season in which Participant underwent their third most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e_2, hx594rea, y_an2a_3_c

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-4	NOT ASCERTAINED	0	1	1
-2	Inappropriate INAPPROPRIATE (HX587RE != 1 \| 0 < HX594REA \| NO 3RD SURGERY REPORTED)	2662	3026	5688
-1	DON'T KNOW	50	74	124
1	Winter	13	10	23
2	Spring	18	26	44
3	Summer	22	39	61
4	Fall	9	9	18

Note: Participants were only asked to provide the season in which they third most recently underwent a surgery that required anesthesia if they did not know or refused to supply the month in which it occurred (see HX594REA).

hx594red: Participant's age at the time of their third most recent surgery that required anesthesia.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e_2, hx594reb, y_BRTHYR, y_an2a_3_d

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1 \| NO 3RD SURGERY REPORTED)	2534	2805	5339
-1	DON'T KNOW	11	12	23
0 - 24		49	75	124
25 - 41		32	95	127
42 - 57		51	74	125
58 - 65		55	69	124
66 - 73		42	55	97

Note: Participants were only explicitly asked to provide their age at the time of surgery if they did not know or refused to supply the year in which the surgery occurred (see HX594REB); for participants who provided a valid year, age at the time of surgery was estimated by subtracting their birth year from it.

hx595re: Summary of how Participant responded when asked to specify the kind of anesthesia-requiring procedure they third most recently underwent.

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx587re, y_an2e_2, y_an2b_3

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	3	6	9
-2	INAPPROPRIATE INAPPROPRIATE (HX587RE != 1 \| NO 3RD PROCEDURE REPORTED)	2534	2805	5339
-1	DON'T KNOW	0	2	2
1	DESCRIBED OR NAMED MEDICAL PROCEDURE	240	378	618

hx596re: Is Participant willing to be contacted in the future about participating in a part of the study examining how surgical procedures involving anesthesia may affect later health?

Data source: Graduate Participant or Proxy Collected in: 2011 Mode: In person & telephone
Source variables: hx355re, hx587re, y_an5

		Frequencies
Value	Label	Male	Female	Total
.	System missing - NR	2146	2019	4165
-30	NOT PART OF MOSAQ	68	116	184
-27	NOT ASKED OF PROXY	9	8	17
-4	NOT ASCERTAINED	1	0	1
-3	REFUSED	1	0	1
-2	INAPPROPRIATE INAPPROPRIATE (HX355RE != 1 & HX587RE != 1)	1818	2311	4129
-1	DON'T KNOW	7	4	11
1	YES	722	622	1344
2	NO	219	246	465

Note: Participants were asked about their willingness to be contacted for future study if they reported having undergone heart surgery when asked in the Health Module (see HX355RE) or reported having undergone some other medical procedure that required anesthesia in the Anesthesia History Module (see HX587RE). When being asked about their willingness to be contacted, participants were informed that not all people who say "yes" would be contacted to participate and that it would most likely be a few years before any contact was made; they were also told that those who are contacted would be formally invited to participate and still have the right to refuse at that time

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Wisconsin Longitudinal Study