Table I.

Unweighted sample sizes in the entire baseline, eligible baseline, and analytic samples with incident cases, by hip symptoms and three hip OA outcomes

	All analyses*	Hip symptoms	Hip OA outcomes
			Radiographic	Symptomatic	Severe radiographic
Entire baseline sample (1991–1997)	3068	3068	3068	3068	3068
Outcome at baseline		1228	803	323	72
Participants at risk at baseline		1840	2265	2745	2996
Other baseline exclusions
Hip replacement		24	24	24	24
Women <50 years		0	312	312	312
Men <50 years		0	175	175	175
Missing baseline		72	58	51	60
Eligible baseline sample	2788	1744	1696	2183	2425
Participant exclusions at 1995–2003 follow-up†
Deceased		200	223	301	338
Mentally/physically unable		98	123	155	181
Moved out of study area		129	119	159	176
Declined participation		276	228	286	296
No clinic exam		75	83	102	107
Unable to locate		30	38	48	55
Eligible at follow-up		936	865	1124	1242
Missing outcome at follow-up		0	17	8	30
Analytic sample	1446	936	864	1116	1212
Incident cases at follow-up		200	107	93	30

^*3068 were enrolled at baseline; 2788 were eligible for analysis of at least 1 of the 4 outcomes; 1446 were analyzed for at least 1 of the 4 outcomes.

^†Participants who were excluded were those who died (deceased), were mentally or physically unable to participate, moved out of the study area, declined to participate, participated in the in-home questionnaire but not the clinic exam (no clinic exam), or were lost to follow up for other reasons (unable to locate).