Table 2.

Odds Ratios and 95% Confidence Intervals Reflecting Associations Between Suicide Ideation and Sleep Variables Across 3 Models^a

	Model 1: Unadjusted			Model 2: Adjusted			Model 3: Overcontrolled
Variable	Category	Odds Ratio	95% CI	P	Odds Ratio	95% CI	P	Odds Ratio	95% CI	Pb
Sleep duration (h) (reference = 7 h)	< 5	4.76	2.76–8.21	< .001	2.43	1.21–4.86	.013	1.32	0.56–3.09	.527
	5	1.72	0.93–3.16	.082	1.13	0.44–2.89	.802	0.97	0.33–2.81	.950
	6	1.43	0.86–2.36	.167	1.30	0.67–2.51	.436	1.11	0.55–2.22	.776
	7	Reference			Reference			Reference
	8	1.69	1.02–2.80	.041	1.03	0.51–2.09	.939	0.92	0.45–1.89	.823
	9	1.08	0.29–4.09	.908	0.97	0.16–5.90	.971	1.14	0.18–7.18	.886
	> 9	3.32	1.55–7.11	.002	3.49	1.31–9.32	.013	2.81	0.98–8.07	.056
Overall insomnia	1-unit increase	1.18	1.13–1.24	< .001	1.16	1.09–1.24	< .001	1.11	1.03–1.18	.003
Difficulty falling asleep (reference = never)	Never	Reference			Reference			Reference
	Rarely	1.42	0.83–2.42	.203	1.44	0.69–2.99	.331	1.40	0.66–2.96	.376
	Sometimes	1.72	1.04–2.82	.033	2.15	1.05–4.39	.036	1.79	0.88–3.67	.110
	Often	3.14	1.91–5.16	< .001	3.21	1.62–6.34	.001	2.18	1.06–4.48	.035
	Almost always	5.74	3.48–9.45	< .001	4.16	1.81–9.53	.001	2.60	0.94–7.22	.066
Difficulty maintaining sleep (reference = never)	Never	Reference			Reference			Reference
	Rarely	0.82	0.46–1.46	.491	1.24	0.57–2.71	.587	1.28	0.59–2.77	.534
	Sometimes	2.10	1.31–3.36	.002	3.55	1.80–7.00	< .001	3.02	1.45–6.29	.003
	Often	2.77	1.74–4.42	< .001	3.86	1.92–7.79	< .001	2.80	1.39–5.64	.004
	Almost always	3.33	1.99–5.56	< .001	3.47	1.64–7.34	.001	1.96	0.91–4.24	.087
Early morning awakenings (reference = never)	Never	Reference			Reference			Reference
	Rarely	1.04	0.61–1.78	.876	0.90	0.46–1.76	.747	0.97	0.50–1.90	.931
	Sometimes	1.59	0.99–2.54	.053	1.66	0.89–3.09	.110	1.46	0.73–2.95	.288
	Often	2.81	1.77–4.46	< .001	2.12	1.03–4.36	.042	1.98	0.97–4.03	.061
	Almost always	3.22	1.93–5.36	< .001	1.99	1.00–3.94	.049	1.32	0.61–2.86	.477

^aModel 1 is unadjusted. Model 2 includes age, sex, race/ethnicity, income, education, marital status, exercise, sedentary activity, smoking, and alcohol use. Model 3 includes all model 2 variables and depressive symptoms.

^bBolding indicates statistical significance.