Table 1.

Characteristics of the Sample (weighted) Combined and Stratified by Suicidal Ideation^a

Variable	Category	Overall Sample	Suicidal Ideation
			Not at All (n = 5,191)	Several Days (n = 177)	More Than Half the Days (n = 33)	Nearly Every Day (n = 40)	Pb
Age (y)	Continuous	45.760 ± 17.224	45.642 ± 16.951	47.176 ± 19.789	42.957 ± 19.452	45.530 ± 19.965	.676
Sex	Male	0.52	0.51	0.49	0.58	0.51	.889
	Female	0.48	0.49	0.51	0.42	0.49
Race	Non-Hispanic white	0.69	0.70	0.61	0.55	0.63	.003
	Hispanic/Latino	0.13	0.13	0.24	0.26	0.22
	Black/African-American	0.11	0.11	0.12	0.17	0.16
	Asian/other	0.06	0.05	0.04	0.02	0.00
Income (US $)	< $20,000	0.16	0.15	0.34	0.45	0.47	< .001
	20,000–$24,999	0.07	0.07	0.12	0.16	0.24
	25,000–$34,999	0.11	0.11	0.15	0.09	0.25
	35,000–$44,999	0.09	0.09	0.08	0.09	0.00
	45,000–$54,999	0.08	0.09	0.05	0.04	0.01
	55,000–$64,999	0.07	0.07	0.07	0.03	0.03
	65,000–$75,000	0.07	0.08	0.06	0.02	0.00
	> $75,000	0.33	0.34	0.12	0.12	0.00
Education	< 9th grade	0.07	0.06	0.16	0.22	0.23	< .001
	9th–11th grade	0.14	0.13	0.16	0.32	0.29
	High school graduate	0.25	0.25	0.26	0.22	0.11
	Some college	0.29	0.29	0.32	0.23	0.37
	College graduate	0.25	0.26	0.11	0.01	0.00
Marital status	Married	0.57	0.58	0.38	0.30	0.33	< .001
	Widowed	0.06	0.05	0.09	0.12	0.05
	Divorced	0.10	0.10	0.13	0.19	0.17
	Separated	0.02	0.02	0.04	0.09	0.14
	Never married	0.18	0.17	0.25	0.20	0.26
	Living with partner	0.07	0.07	0.11	0.11	0.05
Exercise (min)	Continuous	166.06 ± 221.64	168.59 ± 220.19	113.99 ± 213.78	156.21 ± 267.98	134.29 ± 276.23	.018
Sedentary activity (min)	Continuous	334.62 ± 206.86	333.86 ± 204.46	319.26 ± 235.30	345.19 ± 259.41	270.91 ± 208.97	.278
Ever smoked	No	0.53	0.53	0.51	0.23	0.23	.001
	Yes	0.47	0.47	0.49	0.77	0.77
Type of smoker	Never smoker	0.53	0.53	0.51	0.23	0.23	< .001
	Current smoker	0.23	0.22	0.34	0.70	0.53
	Former smoker	0.24	0.25	0.15	0.07	0.24
Alcohol use (no. of drinks/d)	Continuous	2.82 ± 2.76	2.81 ± 2.75	3.08 ± 2.71	3.94 ± 2.83	4.43 ± 4.70	.049
Alcohol use (no. of days ≥ 5 drinks)	Continuous	2.50 ± 2.37	2.48 ± 2.11	3.72 ± 3.66	1.69 ± 3.05	3.38 ± 9.09	.708
Depression	No	0.98	0.98	0.79	0.65	0.23	< .001
	Yes	0.02	0.02	0.21	0.35	0.77
Overall insomnia	Continuous	3.78 ± 3.23	3.77 ± 3.17	5.81 ± 4.07	4.74 ± 4.21	6.33 ± 4.48	< .001
Difficulty falling asleep	Never	0.39	0.38	0.22	0.23	0.17	< .001
	Rarely	0.21	0.22	0.15	0.31	0.12
	Sometimes	0.22	0.22	0.22	0.19	0.15
	Often	0.11	0.11	0.21	0.04	0.23
	Always	0.08	0.07	0.21	0.23	0.34
Difficulty maintaining sleep	Never	0.36	0.36	0.19	0.37	0.24	< .001
	Rarely	0.20	0.20	0.09	0.11	0.16
	Sometimes	0.24	0.24	0.36	0.16	0.16
	Often	0.13	0.13	0.20	0.23	0.28
	Always	0.08	0.08	0.16	0.13	0.16
Early morning awakenings	Never	0.45	0.44	0.30	0.42	0.25	< .001
	Rarely	0.19	0.19	0.13	0.11	0.19
	Sometimes	0.20	0.21	0.24	0.22	0.17
	Often	0.10	0.10	0.21	0.18	0.15
	Always	0.06	0.06	0.12	0.07	0.23
Sleep duration (h)	< 5	0.05	0.05	0.14	0.15	0.17	< .001
	5	0.09	0.09	0.10	0.09	0.10
	6	0.23	0.23	0.21	0.24	0.18
	7	0.29	0.30	0.22	0.12	0.14
	8	0.26	0.26	0.25	0.36	0.36
	9	0.05	0.05	0.04	0.04	0.00
	> 9	0.02	0.02	0.04	0.01	0.06

^aContinuous variables are presented as mean ± SD, and categorical variables are presented as %. Univariate tests include 1-way analysis of variance for continuous variables and χ² tests for categorical variables.

^bBolding indicates statistical significance.