Table 2.

Descriptive statistics and correlations among study variables.

	1.	2.	3.	4.	5.	6.	7.	8.	M	SD
1. Income-to-needs ratio	–								1.49	0.99
2. Environmental conditions	−0.14*	–							1.69	1.50
3. Presleep worries	−0.14*	0.50***	–						1.14	1.50
4. Sleep minutesa	0.16**	−0.07	−0.14t	–					436 min	55 min
5. Night waking durationa	−0.08	0.09	0.16**	0.63***	–				5min and 51 s	3 min and 25 s
6. Variability in sleep schedulea	0.10	0.11t	−0.01	−0.03	0.07	–			0.08	0.05
7. Sleep/wake problemsb	−0.22***	0.40***	0.41***	−0.21***	0.19**	0.05	–		17.39	5.38
8. Sleepinessb	−0.14*	0.36***	0.38***	−0.04	0.08	−0.06	0.39***	–	12.29	3.22

Note. In sleep minutes, 436 min translates into 7 h and 16 min.

^aThis measure is actigraphy derived.

^bThis is a child-reported sleep measure.

^tp < 0.10;

^*p < 0.05;

^**p < 0.01;

^***p < 0.001.