Table 2.

Correlations Between Key Study Variables and Key Demographic Variables

	1	2	3	4	5	6	7	8	9
1. Co-sleepinga	—
2. Toddler sleep problemb	0.116	—
3. Maternal depressive symptoms	−0.056	0.110	—
4. Maternal sleep duration	0.069	−0.126*	−0.225**	—
5. Maternal anxiety symptoms	−0.003	0.087	0.443**	−0.175**	—
6. Parenting stress	0.101	0.096	0.540**	−0.218**	0.413**	—
7. At/below poverty linec	0.268**	−0.025	0.068	0.057	−0.035	0.068
8. Maternal age	−0.156**	0.050	−0.009	−0.251**	−0.034	−0.062	−0.164**
9. Marital statusd	−0.301**	0.021	−0.039	−0.069	−0.016	−0.085	−0.401**	0.312**
Mean (SD) or %	39.6%	83.9%	7.8 (7.5)	6.73 (1.6)	10.1 (3.6)	5.5 (3.2)	69.3%	27.11 (6.2)	73.2%

^aDummy coded in reference to toddler in their separate room from parents (39.6% of toddlers in a separate room).

^bDummy coded in reference to [sleep is] “not a problem” (83.9% did not have a sleep problem).

^cDummy coded in reference to living at or below the poverty line (69.3% of families were at or below the poverty line).

^dCoded in reference to not married (73.2% mothers not married).

^*p < 0.05,

^**p < 0.01. SD, standard deviation.