Table 1

Characteristics of the sample overall

Variable

Total group

(n = 3,522)


Age group, %

45 to 54

35.6

55 to 64

29.6

> 64

34.9

Female, %

61.7

BMI ≥ 30%

39.8

African American

33.8

Smoking now, %

21.6

Knee injury, %

19.1

1High occupational activity, %

46.9

Educational attainment, %

Less than 12 yr

33.7

2Non-managerial Occupation, %

56.2

Poverty rate group, %

Low (< 12%)

21.7

Medium (12 to 25%)

55.9

High (> 25%)

22.4

Knee OA, %

29.5

Bilateral Knee OA, %

14.7

Knee Symptomatic OA, %

17.7

Bilateral Knee Symptomatic OA, %

6.3


1 Self-report of above-median frequency for job-related squatting, lifting, standing, and walking.

2 An indicator of lower SES occupational category which may include jobs where one has less control over the pace of their work and tend to exclude jobs described as office work, managerial, professional, technical, and sales.

Callahan et al. Arthritis Research & Therapy 2011 13:R169   doi:10.1186/ar3492

Open Data