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Table 1 Baseline characteristic of participates

From: Incidence and related risk factors of radiographic knee osteoarthritis: a population-based longitudinal study in China

Characteristic Follow-up Non-follow-up P value
Total (%) 598 (74.5%) 205 (25.5%)  
Baseline socio-demographic, BMI, and history of knee injury
 Age 59.18 ± 6.57 61.48 ± 8.52 <0.01
 BMI 25.96 ± 3.43 26.00 ± 3.98 0.283
 Gender (%)    
  Male 217 (36.3%) 98 (47.8%) <0.01
  Female 381 (63.7%) 107 (52.2%)  
 Education (%)    
  Primary school 136 (22.7%) 44 (21.5%) 0.705
  Middle school or above 462 (77.3%) 161 (78.5%)  
 Injury (%)    
  Yes 30 (5%) 10 (4.9%) 0.937
  No 568 (95%) 195 (95.1%)  
Baseline physical function of the knee
 Range of motion in knee level 129.67 ± 6.60 129.70 ± 7.44 0.945
 Flexion contracture in knee level 1.23 ± 2.21 1.25 ± 2.24 0.898
 50-foot walk test 12.68 ± 2.62 13.48 ± 4.61 0.02
 Chair stand test 8.45 ± 2.19 8.87 ± 3.61 0.115
Baseline knee condition
 Baseline K/L grade in knee level (%)    
  0 776 (64.9%) 248 (60.5%) 0.11
  1 420 (35.1%) 162 (39.5%)  
 Baseline knee pain (%)    
  No pain 513 (85.8%) 185 (90.7%) 0.188
  One knee pain 53 (8.9%) 11 (5.4%)  
  Both knee pain 32 (5.4%) 8 (3.9%)