Table 2. Results of the simple regression analyses for physical activity and RTW, for THA and TKA patients separately.

Covariates		THA			TKA
	B	SE	p-value*	B	SE	p-value*
Total physical activity (min/wk)	-1.85 10−5	6.01 10−5	0.759	-3.33 10−5	5.79 10−5	0.566
Leisure-time physical activity (min/wk)	-2.29 10−5	9.16 10−5	0.804	8.38 10−5	1.68 10−4	0.619
Female	0.325	0.158	0.044	0.182	0.144	0.209
Age	-0.003	0.013	0.817	0.020	0.014	0.150
Body mass index	0.035	0.019	0.068	0.013	0.013	0.349
Highest level of education1
secondary	0.506	0.199	0.013	0.288	0.204	0.162
higher	0.404	0.187	0.034	0.036	0.191	0.852
Partner (ref = no)	-0.476	0.296	0.113	-0.004	0.254	0.883
Number of comorbidities	0.049	0.055	0.374	0.025	0.043	0.568
Work demands 2
physical	0.682	0.195	<0.001	0.482	0.172	0.006
mixed	0.499	0.169	0.004	0.300	0.168	0.078
Total physical functioning	-0.006	0.005	0.219	-0.006	0.004	0.126

RTW = Return to Work; THA = Total Hip Arthroplasty; TKA = Total Knee Arthroplasty

* p ≤0.20 (in bold)

¹ reference group = lower education

² reference group = mentally demanding tasks