TABLE 4.

Logistic regression analysis of factors influencing sleep disorders in oil workers.

	B	SE	Waldχ2	P	OR	95% CI.
Sex (Female)	0.232	0.146	2.515	0.113	1.261	0.947–1.678
Age (30–45)	0.561	0.253	4.909	0.027	1.753	1.067–2.881
Age (>45)	0.517	0.298	3.008	0.083	1.678	0.935–3.011
Educational level (Junior College and above)	0.388	0.185	4.379	0.036	1.473	1.025–2.118
Type of work (Oil transportation)	0.238	0.314	0.572	0.449	1.268	0.685–2.348
Type of work (Borehole operation)	0.989	0.295	11.245	0.001	2.689	1.508–4.792
Type of work (Drilling)	0.877	0.342	6.567	0.010	2.405	1.229–4.705
Type of work (Extract oil)	0.583	0.289	4.070	0.044	1.791	1.017–3.155
Working years (5–15)	−0.302	0.262	1.330	0.249	0.739	0.443–1.235
Working years (>15)	0.251	0.309	0.657	0.418	1.285	0.701–2.354
Shift	0.763	0.145	27.829	0.000	2.144	1.615–2.846
Marital status (Married)	−0.011	0.172	0.004	0.950	0.989	0.706–1.386
Monthly income (>5,000)	−0.029	0.195	0.021	0.884	0.972	0.663–1.424
Occupational stress	0.007	0.003	6.781	0.009	1.007	1.002–1.013
Mental disorders	0.020	0.006	11.928	0.001	1.020	1.009–1.032