Table 1.

Bivariate relationship between sleep difficulties and suicide ideation, plan and attempt in the last 12 months

		Ideation		Plan		Attempt

Difficulty falling asleep^a		N	%	N	%	N	%
No (N=7641)		269/7641	3.6 ± 0.3	65/7640	0.6 ± 0.1	59/7640	0.7 ± 0.2
Yes (N=2254)		239/2254	11.5 ± 1.4	65/2254	3.5 ± 0.7	62/2253	3.8 ± 1.0
χ²		215.59^***		110.52^***		115.08^***
Odds ratio	95% CI	3.51	2.51–4.90^*	5.56	3.03–10.20^*	5.37	2.48–11.64^*

		Ideation		Plan		Attempt

Difficulty maintaining sleep^a		N	%	N	%	N	%
No (N=8531)		329/8531	3.9 ± 0.3	80/8531	0.8 ± 0.2	69/8530	0.9 ± 0.3
Yes (N=1366)		179/1366	15.2 ± 1.6	50/1365	4.4 ± 0.9	52/1365	5.0 ± 1.0
χ²		285.87^***		110.88^***		137.24^***
Odds ratio	95% CI	4.44	3.42–5.75^*	5.44	3.08–9.60^*	5.95	2.61–13.56^*

		Ideation		Plan		Attempt

Early morning awakening^a		N	%	N	%	N	%
No (N=8184)		344/8184	4.4 ± 0.4	80/8182	0.9 ± 0.2	75/8181	1.1 ± 0.2
Yes (N=1712)		164/1712	10.2 ± 1.2	50/1713	3.2 ± 0.7	46/1713	2.9 ± 0.6
χ²		91.30^***		54.90^***		31.52^***
Odds ratio	95% CI	2.47	1.77–3.43^*	3.52	2.07–6.01^*	2.64	1.64–4.26^*

		Ideation		Plan		Attempt

Insomnia score (0–3)		N	%	N	%	N	%
0 (N=6669)		188/6669	2.7 ± 0.3	43/6668	0.5 ± 0.1	39/6668	0.6 ± 0.1
1 (N=1718)		138/1718	9.0 ± 1.4	32/1718	1.6 ± 0.5	31/1717	2.2 ± 0.8
2 (N=916)		102/916	12.7 ± 1.6	32/916	4.2 ± 1.1	24/916	3.8 ± 1.1
3 (N=594)		80/594	14.5 ± 2.5	23/594	5.2 ± 1.5	27/594	5.5 ± 1.4
χ²		326.58^***		156.36^***		218.90^***
Odds ratio	95% CI
0 vs. 3		6.19	3.67–10.47^*	10.40	4.35–24.84^*	10.49	4.74–23.23^*
1 vs. 3		1.70	1.09–2.66^*	3.43	1.56–7.52^*	2.63	1.001–6.90^*
2 vs. 3		1.17	.71–1.90	1.23	.52–2.93	1.49	.66–3.37

N was unweighted. Percentages, chi-squares and odds ratios were calculated using weighted N, taking into account clustering, weighting and stratification of the sample.

p < .05,

^***

p <.001.