TABLE 6.

Collinearity diagnosis of independent variables in multivariate binary logistic regression model.

Independent variables in LDH model a	VIF	Independent variables in LSS model b	VIF
BMI category	1.027	Age category	1.042
Labor intensity	1.009	BMI category	1.015
Genetic history	1.005	Genetic history	1.005
Number of deliveries	1.013	Number of deliveries	1.044
Simple hysterectomy	1.016	Simple hysterectomy	1.015
Hypertriglyceridemia	1.076	Knee joint surgery	1.023
Hyper‐low‐density lipoprotein cholesterolemia	1.086	Hypertriglyceridemia	1.124
Cerebrovascular disease	1.012	Hyper‐low‐density lipoprotein cholesterolemia	1.119
		Diabetes	1.018

Abbreviations: BMI, body mass index; LDH, lumbar disc herniation; LSS, lumbar spinal stenosis; VIF, variance inflation factor.

^a Multivariate binary logistic regression model between independent variables and surgical treatment for LDH in middle‐aged and older women.

^b Multivariate binary logistic regression model between independent variables and surgical treatment for LSS in middle‐aged and older women.