Table 3.

Multiple linear regression coefficient estimates for the patients' 15D score at admission

Explanatory variables	βa	95% CI for β	P value
Waiting time
0–3 months	Reference
> 3–6 months	0.013	-0.016, 0.043	0.381
> 6 months	0.017	-0.014, 0.047	0.286
BMI	-0.003	-0.005, -0.0004	0.020
Affected joint (0 = hip, 1 = knee)	0.013	-0.009, 0.035	0.232
15D score at baseline	0.752	0.637, 0.867	<0.001
Gender (0 = female, 1 = male)	-0.008	-0.032, 0.015	0.479
Age	-0.0004	-0.002, 0.001	0.539
Professional education (0 = no, 1 = yes)	-0.0003	-0.023, 0.022	0.976
Housing (0 = living alone, 1 = living with someone)	0.009	-0.016, 0.034	0.469
Constant	0.301
R square	0.613
F	21.430***
n	133

A positive value indicates improvement in the 15D score, and a negative value indicates worsening.

^a multivariate unstandardised linear regression coefficient

*** P < 0.001