. Author manuscript; available in PMC: 2013 Jun 11.

Published in final edited form as: Osteoarthritis Cartilage. 2009 Apr 23;17(10):1313–1318. doi: 10.1016/j.joca.2009.04.011

Table I.

Baseline characteristics of the study subjects: mean ± SD for continuous variables, frequency (%) for dichotomous of categorical variables

Variables	Cases (n = 102)	Controls (n = 249)
Continuous: mean ± SD
Age (years)	70.7 ±4.3	70.7 ±4.5
Height (cm)	160.7 ±6.2^*	159.2 ±5.7
Weight (kg)	70.5 ±15.1^*	67.0 ±10.9
BMI (kg/m²)	27.2 ±5.3	26.4 ±4.2
Total hip BMD (g/cm²)	0.80 ±0.13^*	0.76 ±0.12
Dichotomous: frequency of Yes (%)
Estrogen use	45 (44.12)	99 (39.76)
Vitamin D use	55 (56.7)	138 (56.56)
Walks for exercise	60.0 (58.8)	124 (49.8%)
Categorical: frequency (%)
Health status
Excellent	31 (30.4%)	100 (40.2%)
Good	58 (56.9%)	119 (47.8%)
Fair	13 (12.8%)	27 (10.8%)
Poor	–	3 (1.2%)

Significant difference cases vs controls at P < 0.05.