Impact of preoperative factors on clinical outcomes after total hip arthroplasty

Table 1 Preoperative factors in groups classified based on the average postoperative Western Ontario and McMaster Universities Osteoarthritis Index score and modified Harris Hip Score, mean ± SD

Characteristics	Age	mHHS	WOMAC	EQ5D	CES-D	PDQ	CSI
mHHS-low	70 ± 11	57 ± 14	50 ± 17	0.47 ± 0.16	17 ± 9	11 ± 7	25 ± 12
mHHS-high	66 ± 10	60 ± 13	38 ± 16	0.51 ± 0.17	13 ± 7	8 ± 6	18 ± 11
P value	< 0.01b	< 0.05a	< 0.01b	< 0.05a	< 0.01b	< 0.01b	< 0.01b
WOMAC-high	70 ± 10	58 ± 14	47 ± 16	0.48 ± 0.17	16 ± 8	11 ± 8	24 ± 12
WOMAC-low	65 ± 11	61 ± 13	37 ± 16	0.51 ± 0.17	12 ± 7	7 ± 6	17 ± 11
P value	< 0.01b	P = 0.051	< 0.01b	P = 0.161	< 0.01b	< 0.01b	< 0.01b
Total	67 ± 11	59 ± 14	41 ± 17	0.50 ± 0.17	14 ± 8	9 ± 7	20 ± 12

^aP < 0.05.

^bP < 0.01.

WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index; mHHS: Modified Harris Hip Score; EQ5D: EuroQol 5 dimensions; CES-D: Center for Epidemiologic Studies Depression Scale; PDQ: Pain Detect Questionnaire; CSI: Central Sensitization Index.

Table 2 Variance inflation factors of the selected explanatory variables in each response variable

Response variable	Explanatory variable	Variance inflation factor	P value
mHHS	Age	1.0728	0.0022a
	WOMAC	1.4862	0.0022a
	CES-D	1.4401	0.0086a
	CSI	1.7599	0.0043a
WOMAC	Age	1.0732	< 0.001b
	WOMAC	1.9039	0.0028a
	EQ5D	1.0198	0.0069a
	CSI	1.798	< 0.001b
	CES-D	1.4453	0.1534
	PDQ	1.5753	0.1162

^aP< 0.05.

^bP< 0.001.

WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index; mHHS: Modified Harris Hip Score; EQ5D: EuroQol 5 dimensions; CES-D: Center for Epidemiologic Studies Depression Scale; PDQ: Pain Detect Questionnaire; CSI: Central Sensitization Index.