Women with knee osteoarthritis have more pain and poorer function than men, but similar physical activity prior to total knee replacement

Table 8 Accelerometer regression (dependent variable was average metabolic equivalent tasks (METS)/day)

Predictor variable	β	Standard error	P value
All subjects:
BMI	-0.074	0.013	< 0.001
Age	-0.039	0.010	< 0.001
OA grade	-0.512	0.171	0.003
Depression	-0.618	0.301	0.042
SF-36 PF	0.011	0.005	0.019
KOOS Pain	-0.011	0.006	0.073
	F value	Significance	Model fit
Overall model	12.086	< 0.001	R² = 0.356
Women:
SF-36 PF	0.016	0.006	0.004
BMI	-0.074	0.015	< 0.001
Age	-0.050	0.011	< 0.001
OA grade	-0.466	0.187	0.019
Women only model	13.284	< 0.001	R² = 0.354
Men:
BMI	-0.079	0.024	0.002
Age	-0.033	0.017	0.061
Men only model	6.269	0.004	R² = 0.218

BMI = body mass index; KOOS = Knee Injury and Osteoarthritis Outcome Score; OA = osteoarthritis; PF = physical function; SF-36 = Short-Form 36.