Baseline sample characteristics by osteoarthritis (OA) status and by progression status. All data are mean (SD), unless otherwise indicated.
| Cross-sectional cohort | Whole cohort (weighted N = 252.5) | NCP (weighted N = 34.4) | PRCP (weighted N = 120.1) | ROA (weighted N = 98.0) | p |
|---|---|---|---|---|---|
| Age, yrs | 56.8 (10.4) | 49.5 (9.9) | 54.9 (9.4) | 61.6 (9.6) | < 0.001 |
| Female (%) | 56.3 | 58.0 | 51.4 | 61.6 | 0.315 |
| BMI, kg/m2 | 26.5 (4.9) | 25.4 (4.3) | 26.0 (4.4) | 27.4 (5.5) | 0.017 |
| WOMAC pain (0–100) | 20.5 (17.8) | 20.6 (16.7) | 17.9 (18.1) | 23.6 (17.4) | 0.115 |
| Longitudinal cohort | Whole cohort (weighted N = 160.5) | No Progression (weighted N = 136.1) | Progression (weighted N = 24.4) | p | |
| Age, yrs | 57.7 (10.1) | 56.9 (10.1) | 62.1 (9.3) | 0.021 | |
| Female (%) | 53.9 | 52.8 | 59.8 | 0.527 | |
| BMI, kg/m2 | 26.0 (4.2) | 26.0 (4.3) | 25.8 (3.6) | 0.826 | |
| WOMAC pain (0–100) | 19.6 (16.8) | 19.1 (17.0) | 22.6 (16.2) | 0.344 | |
| Followup time, yrs; range | 3.3 (0.6); 2.5–5.1 | 3.4 (0.6); 2.5–5.1 | 3.2 (0.4); 2.9–5.1 | 0.387 |
P value for percentage female is based on chi-square test; other p values based on 1-way ANOVA. BMI: body mass index; WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index; NCP: no cartilage pathology; PRCP: preradiographic cartilage pathology; ROA: radiographic OA.