Table 1.

Characteristics of study sample, including participants with hip and/or knee radiographs.

	Total Sample, (n = 2729)	Men (n = 933)	Women (n = 1796)
Mean age (SD), yrs	63.6 (10.5)	63.3 (9.6)	63.8 (10.8)
N (%) African American	885 (33.1)	269 (29.3)	616 (35.0)
Mean BMI (SD)	30.7 (3.7)	29.8 (5.6)	31.1 (7.2)
Smoking
N (%) current smokers	437 (17.0)	194 (22.6)	243 (14.3)
N (%) former smokers	706 (27.6)	326 (37.9)	380 (22.3)
N (%) with prior hip injury	85 (3.2)	36 (4.0)	49 (2.8)
N (%) with prior knee injury	278 (10.6)	109 (11.9)	169 (9.8)
N (%) with radiographic knee OA*	927 (34.5)	317 (34.2)	610 (34.7)
N (%) with symptomatic knee OA**	592 (22.5)	189 (20.6)	403 (23.4)
N (%) with radiographic hip OA†	847 (33.2)	303 (33.3)	544 (33.6)
N (%) with symptomatic hip OA††	294 (11.7)	92 (10.2)	202 (12.6)

^*From 2686 participants with knee radiographs.

^**From 2637 participants with knee radiographs and data on knee symptoms.

^†From 2530 participants with hip radiographs.

^††From 2506 participants with hip radiographs and data on hip symptoms. BMI: body mass index; OA: osteoarthritis.