|Univariate Cox Proportional Hazards Regression||Multivariate Cox Proportional Hazards Regression|
|HR||95% CI||p Value||HR||95% CI||p Value|
|Age (per yr)||1.04||1.03–1.04||<0.001||1.04||1.03–1.04||<0.001|
|Proportion of persons ≥25 yrs of age with ≥4 yrs of college >20%||0.95||0.86–1.05||0.31||0.97||0.86–1.09||0.590|
The primary predictor (quadripolar: bipolar) and 5 covariates were each applied in a univariate Cox proportional hazards regression. All 6 were applied together in a multivariate Cox proportional hazards regression.
CI = confidence interval; HR = hazard ratio.