Table 2.

Demographic and clinical characteristics of all subjects in the study

Variables	Cases (n = 156)	Control (n = 58)	P
Age (years), mean ± SD	60.8 ± 7.2	60.4 ± 6.1	ns
Female, n (%)	85 (54.5%)	32 (55.2%)	ns
Obesity, n (%)	86 (55.1%)	24 (41.4%)	0.001a
Smoker, n (%)	64 (41.0%)	23 (39.7%)	ns
History of heavy labor work, n (%)	44 (28.2%)	17 (29.3%)	ns
Family history of OA, n (%)	20 (12.8%)	8 (13.8%)	ns
KL grade
≤3	96	–
>3	60	–

OA: osteoarthritis; KL: Kallgren-Lawrence; ns: not significant.

^aStatistically significant (vs. control).