Skip to main content

Table 1 Characteristics of participants (n = 326)

From: Genetic mechanisms of knee osteoarthritis: a population-based longitudinal study

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
  1. 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.