Table 1. Data summary.
| Women without knee OA | Women with knee OA | p-value | |
|---|---|---|---|
| No. | 3121 | 2027 | NA |
| Age (years) | 60.0 (8.3) | 67.4 (9.0) | <0.001 |
| BMI (kg/m2) | 23.6 (3.0) | 24.8 (3.4) | <0.001 |
| Knee pain (NRS) | 0.8 (2.2) | 2.0 (3.3) | <0.001 |
| Kellgren-Lawrence grade (knee joint, 0 / 1 / 2 / 3 / 4) |
2046 / 1075 / 0 / 0 / 0 | 0 / 0 / 771 / 929 / 327 | <0.001 |
| Hip pain (NRS) | 0.7 (2.1) | 0.9 (2.5) | <0.001 |
| Low back pain (yes / no) | 2324 / 797 | 1370 / 657 | <0.001 |
| Depressive symptom (yes / no) | 2991 / 130 | 1971 / 56 | 0.009 |
| Weight change (>10kg gain/6-10kg gain/3-6kg gain/no change/3-6kg loss/ 6-10kg loss/>10kg loss) | 23 / 43 / 404 / 2289 / 301 / 47 / 14 | 13 / 28 / 167 / 1472 / 283 / 53 / 11 | <0.001 |
| Current amount of smoking (pieces) | 0.4 (2.2) | 0.3 (2.0) | 0.123 |
| Cumulative amount of smoking (pack) | 83.1 (1050.9) | 84.5 (911.5) | <0.001 |
| Amount of alcohol consumption (g/day) | 1.6 (5.1) | 1.1 (4.1) | <0.001 |
| Activity | |||
| Weekly duration of vigorous-intensity activity (min) | 73.3 (275.2) | 67.0 (329.3) | 0.456 |
| Weekly duration of moderate-intensity activity (min) | 116.3 (358.5) | 123.1 (394.3) | 0.524 |
| Weekly duration of walking (min) | 241.5 (335.0) | 223.7 (350.7) | 0.067 |
Continuous variables are presented as mean (SD). OA, osteoarthritis; NA, not applicable; NRS, numerical rating scale; min, minutes.