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Table 2 General characteristics of the study population

From: Vitamin D receptor gene polymorphisms and susceptibility for primary osteoarthritis of the knee in a Latin American population

  Cases
(n = 107)
Controls
(n = 114)
p
Age (mean ± SD years) 57.6 ± 8.9 51.7 ± 8.7 0.00001
BMI (mean ± SD kg/m2) 26.4 ± 2.8 25.7 ± 3.4 0.08
Gender, females (n, %) 86 (81.1) 95 (83.3) 0.66
Smoking (n, %) 21 (26.9) 11 (26.83) 0.9
Alcoholism (n, %) 22 (28.2) 10 (24.4) 0.6
Occupational activity (n, %)
 Current (n, %) 9 (8.4) 11 (9.6) 0.7
 Previous (n, %) 11 (10.3) 14 (12.3) 0.6
Sports activity
 Current (n, %) 18 (16.8) 29 (25.4) 0.12
 Previous (n, %) 51 (47.7) 76 (66.7) 0.004
Kellgren-Lawrence grading
 Grade 0, n (%) 0 70 (61.4)  
 Grade 1, n (%) 0 44 (38.6)  
 Grade 2, n (%) 38 (35.5) 0  
 Grade 3, n (%) 46 (42.9) 0  
 Grade 4, n (%) 23 (21.5) 0