Table 4: Multivariate regression analysis summary.
Variables Included 

95% CI for Odds Ratio 
B (SE) 
Lower 
Odds ratio 
Upper 
Constant 
0.879 (0.634) 



OKTA (categorical) 
1.219 (0.342) ^{b}

1.730 
3.384 
6.619 
OHBSA (categorical) 
0.916 (0.342) ^{b}

1.279 
2.499 
4.882 
Age (continuous) 
0.032 (0.014)^{a}

0.942 
0.969 
0.997 
Gender 
0.833 (0.342) ^{a}

0.222 
0.435 
0.850 
Note: R^{2} = 0.442 (Hosmer & Lemeshow), 0.118 (Cox & Snell), 0.198 (Nagelkerke). Model _{X}^{2}(4) = 37.52, P< 0.001. ^{a}P<0.05, ^{**}P<0.01.