TABLE 6.

Logistic regression analysis of the effects of occupational stress, mental disorders and cytokines on sleep disorders in oil workers.

Variables	B	SE	Waldχ2	P	OR	95% CI.
Occupational stress	0.036	0.008	18.735	<0.001	1.037	1.020–1.054
Mental disorders	0.046	0.005	84.399	<0.001	1.047	1.037–1.057
IL2	−0.485	0.18	7.27	0.007	0.616	0.433–0.876
IL6	0.021	0.03	0.521	0.470	1.022	0.964–1.083
TNF-a	0.001	0.015	0.007	0.935	1.001	0.973–1.031