Health enhancing physical activity in patients with hip or knee osteoarthritis - an observational intervention study

Table 1 Descriptives of the study population (N = 6810), predictors, crude and adjusted odds ratios (OR) with 95% confidence intervals (95% CI)

Predictor	Mean (SD)	Group	%	Crude OR (95% CI)	Adjusted OR (95% CI)
Time	n.a.	0 month	n.a.	1.00	1.00
		3 month	n.a	0.83 (0.77–0.88)	0.78 (0.72–0.84)
		12 month	n.a	1.07 (1.00–1.15)	1.10 (1.02–1.19)
Age	65 (9)	22–54 years		1.00	1.00
		55–64 years		0.75 (0.65–0.85)	0.74 (0.64–0.85)
		65–74 years		0.50 (0.44–0.57)	0.47 (0.42–0.54)
		75–100 year		0.78 (0.67–0.91)	0.64 (0.55–0.75)
Charnley category^a	n.a.	A	35	1.00	1.00
		B	31	1.05 (0.94–1.17)	1.00 (0.90–1.11)
		C	33	1.38 (1.25–1.53)	1.15 (1.04–1.28)
BMI	28 (5)	Normal weight		1.00	1.00
		Overweight		1.39 (1.25–1.56)	1.27 (1.14–1.42
		Obesity		2.36 (2.10–2.65)	1.93 (1.71–2.17)
Gender	n.a.	Man	27	1.00	1.00
Gender	n.a.	Woman	73	0.80 (0.73–0.88)	0.69 (0.62–0.75)

n.a.not applicable
^aCharnley category A: One joint with osteoarthritis (knee or hip). B: Bilateral osteoarthritis (both knees or both hips) C: Osteoarthritis in multiple joint sites (hip and knee), or presence of any other disease that affects walking ability