Variablesa n  

Kellgren-Lawrence score

p
  Grade 2,3,4 Grade 1 Grade 0
  (N=65) (N=132) (N=296)
Sex, age, anthropometric factors, and medical history
Sex            
male 120   15 (13%)     34 (28)     71 (59)     0.974c
female 373   50 (13%)     98 (26)     225 (60)    
Age (years)  493 range 50.2-83.7 43.1-83.2 40.1-81.0 <0.0001b
  median 67.8 65.3 57.3
Height (cm) 493 range 141-174 136-174 137-183 0.031b
  median 153 153 154
Weight at age 40 (kg) 493 range 39-90 35-75 36-95 0.506b
  median 54 53 53
BMI at age 40 (kg/m2) 493 range 17.8-35.4 16.0-29.8 15.8-30.3 0.002b
  median 22.9 22.1 21.8
Weight (kg) 493 range 37-86 33-92 35-91 0.625c
  median 55 55 55
BMI (kg/m2) 493 range 18.3-38.7 15.9-34.9 13.8-32.2 0.043c
  median 23.9 23.2 22.9
History of treatment for knee injury (≥2 weeks)
none 408   45 (11%)     100 (25)     263 (64)     <0.0001c
presence 85   20 (24%)       32 (38)       33 (39)    
Occupation and lifestyle            
Occupation            
Non-physical workers 276   27 (10%)     67 (24)     182 (66)     0.001c
Physical workers 217   38 (18%)     65 (30)     114 (53)    
Often good posture while sitting before age 40
no 218   20 (9%)     52 (24)     146 (67)     0.003c
yes 275   45 (16%)     80 (29)     150 (55)    
aVariables are expressed as a percentage, bKruskal-wallis test, cChi-square test.
Table 1: Selected subject characteristics.