Table 2. Intercorrelations of participants’ characteristics and sleep variables among a homeless sample (N = 747).

	1	2	3	4	5	6	7	8	9	10	11	12	13
1. Sexa	1	0.046	-0.127***	0.049	-0.123***	0.158***	0.088*	0.162***	-0.134***	-0.036	0.081*	0.054	-0.029
2. Raceb		1	0.029	-0.080*	-0.043	-0.018	0.146***	0.100**	-0.120**	0.074*	0.116***	-0.076*	-0.131***
3. Age			1	0.105**	0.242***	0.025	0.113**	0.021	0.061	-0.031	-0.049	-0.012	-0.030
4. Educational attainment				1	-0.070	0.078*	-0.052	-0.007	-0.055	-0.128***	-0.013	-0.024	-0.073*
5. Lifetime months homeless					1	-0.041	0.061	0.019	0.110**	0.042	0.037	0.029	0.036
6. BMIc						1	0.067	0.059	-0.136***	-0.141***	-0.048	-0.044	-0.035
7. Self-rated healthd							1	0.119**	-0.003	0.051	0.185***	-0.121***	0.050
8. Serious mental illnesse								1	0.029	0.026	0.181***	-0.046	0.046
9. At-risk drinkerf									1	0.046	0.049	-0.127***	0.040
10. Smokerg										1	0.067	-0.025	-0.042
11. Days of insufficient rest/sleeph											1	-0.361***	0.185***
12. Sleep durationi												1	0.019
13. Days with unintentional sleepj													1

Note: Associations between continuous variables were assessed using Pearson product moment correlations, associations between categorical variables and continuous variables were assessed using Point-biserial correlations, and associations between categorical variables were assessed using Phi coefficients.

*p<0.05

**p<0.01

***p<0.001.

^a1 = Male; 2 = Female.

^b1 = Minority; 2 = White.

^c1 = Underweight/Normal weight; 2 = Overweight; 3 = Obese.

^d1 = Excellent/very good/good; 2 = Fair/poor.

^e1 = No serious mental illness; 2 = Serious mental illness.

^f1 = Not at-risk drinker; 2 = At-risk-drinker.

^g1 = Non-smoker; 2 = Smoker.

^h1 = 0 days insufficient rest/sleep; 2 = 1–13 days insufficient rest/sleep; 3 = 14–29 days insufficient rest/sleep; 4 = ≥30 days insufficient rest/sleep.

ⁱ1 = ≤ 6 hours; 2 = 7–9 hours; 3 = ≥ 10 hours.

^j1 = 0 days with unintentional sleep; 2 = ≥1 day with unintentional sleep.