Table 1.
Characteristics of participants (n = 326)
| Characteristic | Offspring (n = 163) | Controls (n = 163) | P |
| Values at baseline (2000–2001) | |||
| Age (years) | 45.1 ± 6.5 | 45.2 ± 6.5 | 0.87 |
| Height (cm) | 169 ± 8 | 169 ± 9 | 0.84 |
| Weight (kg) | 80 ± 16 | 75 ± 14 | 0.04 |
| BMI (kg/m2) | 27.9 ± 5.1 | 26.2 ± 4.3 | 0.02 |
| Prevalence of knee pain (%) | 47 | 22 | <0.01a |
| Lower-limb muscle strength (kg) | 127 ± 49 | 135 ± 50 | 0.006 |
| PWC170 (W/kg) | 2.94 ± 1.13 | 2.91 ± 0.99 | 0.77 |
| Change during two-year follow-up | |||
| Change in weight (kg) | 1.2 ± 4.4 | 1.3 ± 5.0 | 0.89 |
| Change in BMI (kg/m2) | 0.6 ± 1.5 | 0.7 ± 1.8 | 0.58 |
| Incidence of knee pain (%) | 47 | 41 | 0.35a |
| Change in lower-limb muscle strength (kg) | -8.5 ± 24.6 | -10.7 ± 28.0 | 0.47 |
| Change in PWC170 (W/kg) | -0.7 ± 1.0 | -0.4 ± 0.9 | <0.01 |
Where errors are shown, results are means ± SD. BMI, body mass index; PWC170, physical work capacity at 170 beats/minute. aMcNemar tests; others are paired t tests.