Table 1.
Characteristics and outcomes (mean and SE) of participants with at least two radiographs
| First radiograph | Last radiograph | |||
|---|---|---|---|---|
| Runners’ club | Community controls | Runners’ club | Community controls | |
| Number of participants | 45 | 53 | 45 | 53 |
| Age (years) | 59.8 (0.98) | 60.2 (0.88) | 71.2 (0.92) | 72.2 (0.89) |
| Men (%) | 64.4 | 69.8 | ||
| Education (years) | 16.9 (0.35) | 16.7 (0.29) | ||
| Previous knee injury (%) | 44.4 | 35.9 | ||
| BMI (kg/m2) | 22.3 (0.33) ** | 24.0 (0.47) | 23.1 (0.39) * | 24.8 (0.64) |
| HAQ-DI (0–3) | 0.03 (0.01) | 0.05 (0.01) | 0.09 (0.03) | 0.15 (0.05) |
| Vigorous exercise (minutes/week) | 296.2 (25.6) *** | 100.6 (16.4) | 293.8 (32.2)* | 199.0 (24.7) |
| Running (minutes/week) | 213.9 (18.7) *** | 28.8 (11.2) | 94.8 (23.5)*** | 0.9 (0.7) |
| Current runners (%) | 97.8*** | 17.0 | 55.6*** | 3.8 |
| Time from first radiograph (years) | 11.3 (0.8) | 12.0 (0.8) | ||
| Total knee score | 1.29 (0.37) * | 0.40 (0.13) | 3.60 (0.52) | 4.21 (0.98) |
| Prevalent radiographic OA (%) | 6.7 | 0 | 20.0 | 32.1 |
| Joint space width (worst knee), mm | 4.54 (0.09) * | 4.84 (0.07) | 3.82 (0.19) | 3.80 (0.22 ) |
*
p<0.05 compared to community controls
**
p<0.01 compared to community controls
***
p< 0.001 compared to community controls
HAQ-DI Health Assessment Questionnaire Disability Index