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Table 1 Demographic and clinical characteristics of all subjects in the study

From: OPN gene polymorphisms influence the risk of knee OA and OPN levels in synovial fluid in a Chinese population

Variables Cases (n= 750) Control (n= 794) P
Age, years, mean ± SD 65.2 ± 7.6 65.1 ± 5.4 ns
Female, n (%) 401 (53.47%) 406 (51.13%) ns
BMI, kg/m2, mean ± SD 27.7 ± 2.4 22.5 ± 3.1 0.001
Smoker, n (%) 283 (37.73%) 291 (36.65%) ns
Family history of OA, n (%) 60 (8.00%) 67 (8.43%) ns
History of labor work, n (%) 140 (18.66%) 158 (19.89%) ns
Hypertension 198 (26.4%) 206 (25.9%) ns
Diabetes mellitus 152 (20.3%) 166 (20.9%) ns
KL grade    
= < 3 351 -  
> 3 399 -  
  1. BMI, body mass index; OA, osteoarthritis; KL, Kellgren-Lawrence; ns, not significant.