Supplementary Materials

 
Table S1. Variance inflation factor (VIF) and tolerance for baseline covariates.
Term VIF VIF 95%CI (low) VIF 95%CI (high) SE factor Tolerance Tolerance95% CI (low) Tolerance95% CI (high)
CTI 1.01 0.95 1.10 1.00 0.99 0.91 1.05
Joint disease 1.03 0.96 1.12 1.02 0.97 0.89 1.04
Education level 1.05 0.97 1.15 1.02 0.95 0.87 1.03
Smoking status 1.41 1.20 1.65 1.19 0.71 0.61 0.83
Asthma 1.01 0.94 1.10 1.00 0.99 0.91 1.06
Marital status 1.05 0.96 1.16 1.02 0.96 0.86 1.04
Residence 1.04 0.95 1.14 1.02 0.97 0.88 1.05
Age 1.10 1.00 1.25 1.05 0.91 0.80 1.00
Sex 1.55 1.30 1.85 1.24 0.65 0.54 0.77
Liver disease 1.01 0.94 1.11 1.00 0.99 0.90 1.06
Kidney disease 1.01 0.94 1.11 1.00 0.99 0.90 1.06
Gastrointestinal disease 1.03 0.95 1.14 1.01 0.97 0.88 1.05
Drinking status 1.20 1.05 1.40 1.10 0.83 0.71 0.95
VIF = variance inflation factor; SE factor = √VIF. Generally, VIF < 5 indicates acceptable collinearity, whereas VIF ≥ 10 suggests severe multicollinearity.