Characteristic | All | Maintain WC1 | Increase WC2 |
---|---|---|---|
Total sample (n = no. participants if data are missing) | 2556 | 1775 | 801 |
Age°, yrs | 68.4 [(8.7) 53, 87] | 69.0 [(8.7) 53, 87] | 67.1 [(8.4) 53, 87] |
Sex^, female, % (n) | 56.3 (1439) | 56.7 (995) | 55.4 (444) |
Race^, white, % (n) | 83.9 (2145) | 85.1 (1493) | 81.4 (652) |
Education^, ≥ college, % (n), N = 2554 | 67.0 (1706) | 67.5 (1180) | 66.1 (526) |
BMI°, kg/m2 (n = 2555) | 28.5 [(4.9) 15.5, 53.5] | 27.8 [(4.6) 15.5, 50.4] | 29.9 [(5.3) 18.4, 53.5] |
Knee pain°, n = 2551 | 2.5 [(4.1) 0, 24.0] | 2.4 [(4.0) 0, 24.0] | 2.7 [(4.2) 0, 23.4] |
Comorbidity°, n = 2539 | 0.6 [(1.1) 0, 8.0] | 0.6 [(1.1) 0, 8.0] | 0.6 [(1.0) 0, 7.0] |
Depression°, n = 2531 | 6.1 [(6.6) 0, 51.0] | 6.0 [(6.5) 0, 47.0] | 6.5 [(7.0) 0, 51.0] |
Radiographic knee OA°, % (n) | 64.4 (1645) | 64.0 (1122) | 65.3 (523) |
WC at 96-month visit°, cm | 102.9 [(12.8) 62.8, 163.5] | 100.5 [(11.8) 62.9, 145.4] | 108.4 [(13.3) 72.0, 163.5] |
8-year change in WC, cm | 1.5 [(8.6) −37.9, 45.8] | −2.7 [(6.1) −37.9, 4.9] | 10.7 [(5.5) 5.0, 45.8] |
WOMAC-PF at 96-month visit° | 6.9 [(8.0) 0, 28.0] | 6.6 [(7.8) 0, 28] | 7.6 [(8.2) 0, 28] |
WOMAC-PF at 108-month visit* | 8.4 [(9.9) 0, 68] | 8.1 [(9.8) 0, 68] | 9.2 [(10.3) 0, 46.0] |
Values are mean [(SD) min, max] unless otherwise indicated. Knee pain = WOMAC pain subscale score. Comorbidity = Charlson Comorbidity Index score. Depression = Center for Epidemiologic Studies Depression Scale score.
↵1 Maintain WC were participants who changed their WC < 5 cm over 8 years.
↵2 Increase WC were participants who had a change in WC ≥ 5 cm over 8 years.
↵^ Data collected at study enrollment.
↵° Data collected at 96-month visit.
↵* Data collected at 108-month visit. BMI: body mass index; OA: osteoarthritis; WC: waist circumference; WOMAC-PF: Western Ontario and McMaster University Osteoarthritis Index physical function subscale.