Table 1.
Baseline characteristic of participants.
| Men |
Women |
|||||
|---|---|---|---|---|---|---|
| N | Median | IQR | N | Median | IQR | |
| Age (yrs) | 397 | 64.0 | 61.8–66.5 | 423 | 65.5 | 63.3–67.6 |
| Follow-up time (yrs) | 182 | 11.7 | 11.3–12.0 | 195 | 10.1 | 9.7–10.4 |
|
| ||||||
| N | Mean | SD | N | Mean | SD | |
| Activity score | 397 | 63.6 | 14.8 | 423 | 61.2 | 15.1 |
| Height (cm) | 397 | 174 | 6.7 | 423 | 161 | 5.8 |
|
| ||||||
| N | Median | IQR | N | Median | IQR | |
| Weight (kg) | 397 | 81.0 | 74.0–88.5 | 423 | 68.5 | 60.5–79.5 |
| BMI (kg/m2) | 397 | 26.6 | 24.4–28.7 | 423 | 26.3 | 23.6–29.9 |
| Alcohol consumption (units/week) | 397 | 9.5 | 2.3–21.0 | 423 | 1.5 | 0.0–5.0 |
|
| ||||||
| Total N | N | % | Total N | N | % | |
| Smoker status | 397 | 422 | ||||
| Never | 124 | 31.2 | 262 | 62.1 | ||
| Ex | 208 | 52.4 | 121 | 28.7 | ||
| Current | 65 | 16.4 | 39 | 9.2 | ||
| Social class | 377 | 423 | ||||
| I-IIINM | 158 | 41.9 | 157 | 37.1 | ||
| IIIM-V | 219 | 58.1 | 266 | 62.9 | ||
|
| ||||||
| N | Median | IQR | N | Median | IQR | |
| Circulating 25(OH)D (nmol/l) | 397 | 44.6 | 35.0–63.0 | 423 | 41.3 | 29.8–53.5 |
|
| ||||||
| N | Mean | SD | N | Mean | SD | |
| Lumbar spine BMD (g/cm2) | 396 | 1.08 | 0.16 | 422 | 0.96 | 0.17 |
| Femoral neck BMD (g/cm2) | 394 | 0.85 | 0.12 | 421 | 0.76 | 0.12 |
| Total femoral BMD (g/cm2) | 394 | 1.04 | 0.13 | 421 | 0.89 | 0.13 |
|
| ||||||
| Total N | N | % | Total N | N | % | |
| Radiographic knee OA | 397 | 169 | 42.6 | 423 | 164 | 38.8 |
| Radiographic knee OA at follow up | 166 | 83 | 50.0 | 178 | 103 | 57.9 |
| Clinical knee OA at follow up | 176 | 19 | 10.8 | 191 | 36 | 18.8 |