Table 1.

Subject characteristics

Variable	Weight Loss Group	Comparison Group
Age, yr	42.8 ± 10.6	43.6 ± 10.7
Height, m	1.70 ± 0.09	1.68 ± 0.09
Mass, kg	125.7 ± 26.6	62.3 ± 11.7
BMI, kg/m2	43.2 ± 6.5	21.8 ± 2.8
WOMAC
Pain (scale 0 to 20)	3.3 ± 2.4	2.3 ± 1.83
Stiffness (0 to 12)	2.3 ± 1.7	2.1 ± 1.57
Mobility difficulty (0 to 68)	10.0 ± 9.4	8.7 ± 6.78
Weight loss at 7.0 mo, kg	34.0 ± 9.3*
Weight loss at 12.8 mo, kg	42.2 ± 14.1†

Values are mean ±SD. WOMAC, Western Ontario and McMaster Universities Arthritis Index.

^*P < 0.05, relative to before metabolic surgery.

^†P < 0.05, relative to before and 7.0 mo after metabolic surgery.