TABLE I.

Methodological details of surveys currently in the AHTUS database

	1965–66	1975–1976	1985	1992–1994	2003
Survey organization	Survey Research Center, University of Michigan,	Survey Research Center, University of Michigan	Survey Research Center, University of Maryland	Survey Research Center, University of Maryland	United States Bureau of Labor Statistics and United States Census Bureau
Funder	National Science Foundation (NSF)	NSF, US Depart- ment of Health, Education, & Wel- fare	NSF; ATT	Environmental Pro- tection Agency	USA Department of Labor
Sample	Jackson 759 diaries; National 1262 dia- ries	4584 diaries (main respondent only)	2636 diaries	7514 diaries	19,663 diaries
Age range	19–65 (some up to 69)	18 +	12+ (18+ in AH- TUS)	0+ (18+ in AH- TUS)	15+ (18+ in AHTUS)
Months	November–Decem- ber 1965; January– February; March– May 1966	October–November 1975; February– March; May–July; September–October 1976	January–December 1985	September 1992– October 1994	January– December 2003
Response rate	82% Jackson; 74% national sample	72% first wave; 45% did all 4 waves	55% overall, 51% for mail back sample	63%	58%
Mode of collection	Self-completion with guidance from inter- viewer	Self-report waves 1&4; phone waves 2– 3	3 samples: CATI; self-completion, per- sonal interview (only self-completed in AHTUS)	CATI	CATI
Diary type	Mostly designated day	Previous day	Designated day	Previous day	Previous day
Notes on sample	Sample of urban households having at least one employed member; separate national and Jackson MI samples	Sample of all house- holds; longitudinal–4 waves; reduced dia- ries for spouses (if married)	Sample of telephone households; all eligi- ble household mem- bers asked to keep diaries	Sample of telephone households	Sample of all households; former respondents in CPS Wave 8; Par- ents with dependent children over-sampled