Table 3.

Principal axis factor analysis, non-orthogonal rotated structure matrix loadings

Items	Factor 1	Factor 2	Factor 3	Uniqueness
Q.8 Problem related to health	0.1053	0.1416	0.0277	0.7022
Q.9 Mobility aids or assistive devices	−0.1540	0.0442	0.3470	0.7427
Q.10 Pain medications	0.2065	0.0684	0.1394	0.6174
Q.11.1 Acute pain (activities)	−0.0033	0.7963	0.0158	0.3111
Q.11.2 Acute pain (interference)	0.0763	0.7701	0.0005	0.2900
Q.12.1 Chronic pain (activities)	0.8214	0.0386	0.0329	0.2128
Q.12.2 Chronic pain (interference)	0.8315	0.0152	0.0092	0.1969
Q.13 Daily activities	0.2573	0.0229	0.5321	0.3854
Q.14 Work/school life	0.0679	0.0477	0.5931	0.6613
Q.15 Joint surgery or procedure	0.0489	0.0222	−0.0031	0.8356
Q.16 Comorbid diseases	−0.0022	−0.0832	0.0642	0.7874