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), yrs63.6 (10.5)63.3 (9.6)63.8 (10.8)
N (%) African American885 (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 smokers437 (17.0)194 (22.6)243 (14.3)
  N (%) former smokers706 (27.6)326 (37.9)380 (22.3)
N (%) with prior hip injury85 (3.2)36 (4.0)49 (2.8)
N (%) with prior knee injury278 (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.