Table 4 Summary of backward multiple linear regression analysis for physical component score (SF-36) as the dependent variable.

Independent variable	Unstandardized ß	ß	Adj. R²	F	95% CI	p	sr²	VIF
			0.731	66.697	53.8–64.4	< 0.001
Educational level^a
Secondary	6.373	0.286			2.7–10.0	< 0.001	0.011	8.89
Tertiary	6.117	0.274			2.4–9.9	0.001	0.006	9.08
Surgery
6–10	− 1.608	− 0.062			− 3.1; − 0.14	0.035	0.004	1.04
Pain locations^a
1–2	− 2.995	− 1.110			− 5.1; − 0.6	0.011	0.005	2.55
3–4	− 3.422	− 0.126			− 5.8; − 0.9	0.006	0.006	2.76
5–7	− 4.574	− 0.170			− 7.2; − 1.8	< 0.001	0.009	3.42
> 7	− 5.584	− 0.200			− 8.5; − 2.5	< 0.001	0.011	3.9
Age	− 0.084	− 0.122			− 0.12; − 0.04	< 0.001	0.013	1.21
BMI	− 0.232	− 0.110			− 0.4; − 0.1	< 0.001	0.010	1.24
NRS fatigue	− 0.674	− 0.157			− 1.0; − 0.3	< 0.001	0.011	1.94
NRS pain	− 0.760	− 0.178			− 1.2; − 0.4	< 0.001	0.012	2.58
PDI	− 0.295	− 0.399			− 0.4; − 0.2	< 0.001	0.048	3.32
HADS anxiety	0.447	0.162			0.3–0.6	< 0.001	0.018	1.45
FABQ	− 0.071	− 0.134			− 0.1; − 0.03	< 0.001	0.009	1.98

Adj. R² = explained variance, sr² = squared semi-partial correlation, VIF = variance inflation factor, ß = standardized regression coefficient.
Adj. R² adjusted R², NRS numeric rating scale, PDI pain disability index, HADS Hospital Anxiety and Depression Scale, FABQ Fear-Avoidance Beliefs Questionnaire.
^aDummy coded variables.

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