Table 5. Unadjusted and adjusted models of logistic regression to explore associations between independent variables and cases and controls .

*Control category was the reference category

Variables		Unadjusted* odds ratio (95%CI)	Reference	p-value	Adjusted* odds ratio (95% CI)	Reference	p-value
Marital status	Married/ unmarried	0.22	0.05-0.91	0.03	0.31	0.05-1.75	0.18
Stress	Present/ absent	2.98	1.04-8.52	0.04	5.01	1.09-22.90	0.03
Posture of sleep	Supine/ right/ left	0.32	0.11-0.95	0.04	0.40	0.09-1.74	0.22
Gene	FF or Ff or ff	0.17	0.05-0.58	0.004	0.15	0.03-0.80	0.02
Arsenic		1.82	1.11-2.96	0.01	1.63	0.88-3.03	0.12
Lead		1.92	1.23-2.99	0.004	1.62	0.96-2.71	0.06