Table 3.

Results of univariate linear regression analysis and multivariate stepwise regression analysis of different factors

Influencing factor	Univariate linear regression analysis					Multivariate stepwise regression analysis
	B	SE	T	P	β (95% CI)	B	SE	t	P	β (95% CI)
Body mass index*	−0.987	0.431	−2.292	0.025	−0.273 (−1.848, −0.127)	−0.651	0.299	−2.176	0.033	−0.180 (−1.249, −0.053)
Preoperative HSS score*	−0.644	0.145	−4.431	<0.001	−0.482 (−0.935, −0.354)	−0.474	0.113	−4.197	<0.001	−0.354 (−0.699, −0.248)
Tibiofemoral arthritis KL score	2.649	2.448	1.082	0.283	0.133 (−2.240, 7.538)	–	–	–	–	–
Proximal tibiofibular arthritis KL score*	−7.086	1.867	−3.795	<0.001	−0.426 (−10.815, −3.357)	−7.199	1.417	−5.082	<0.001	−0.433 (−10.032, −4.366)
Inclination of proximal tibiofibular articulation*	0.526	0.204	2.576	0.012	0.304 (0.118, 0.934)	0.562	0.147	3.816	<0.001	0.325 (0.267, 0.856)
Preoperative FTA of the lower extremity	−0.194	0.400	−0.485	0.629	−0.060 (−0.994, 0.605)	–	–	–	–	–
Changes in the FTA of the lower extremity at 18 months postoperatively	−0.442	0.767	−0.576	0.567	−0.071 (−1.973, 1.090)	–	–	–	–	–
Changes in the vertical distance between the top of the fibular head and the tibial plateau*	23.493	7.355	3.194	0.002	0.368 (8.805, 38.181)	15.198	5.364	2.833	0.006	0.238 (4.472, 25.923)
Distance between the resected plane and the fibular head	−0.473	0.979	−0.484	0.630	−0.060 (−2.428, 1.481)	–	–	–	–	–
Length of the resected fibula	−0.395	0.422	−0.936	0.353	−0.115 (−1.239, 0.448)	–	–	–	–	–

*From the univariate linear regression analysis, the difference was statistically significant (P < 0.05); thus, the factor was included in the multivariate linear regression analysis. SE, standard error; CI, confidence interval; HSS, Hospital for Special Surgery; KL, Kellgren–Lawrence; FTA, femorotibial angle