Table 2.

Descriptive statistics of and intercorrelations among key variables and considered covariates

	M	SD	1	2	3	4	5	6	7	8	9
1. Infant cortisol response (μg/dl)	0.16	0.30	1
2. Unpredictability of maternal sensory signals	0.79	0.15	−0.22*	1
3. Infant baseline cortisol (μg/dl)	0.23	0.20	−0.31*	0.13	1
4. Saliva collection time	11:32	2:32	0.08	0.09	−0.26*	1
5. Maternal distress (anxiety and depression)	−0.16	0.81	−0.09	0.01	0.00	0.09	1
6. Maternal sensitivity	9.92	1.17	−0.05	−0.21*	−0.11	−0.14	−0.15	1
7. Maternal marital status (1 = married)	0.79	0.41	−0.08	−0.11	−0.11	−0.21*	−0.10	0.31*	1
8. Maternal education (years)	15.83	2.44	−0.12	−0.16	−0.06	−0.29*	−0.05	0.35*	0.43*	1
9. Family income-to-needs ratio (percent)	434.34	248.22	−0.02	−0.28*	0.04	−0.13	−0.28*	0.33*	0.33*	0.54*	1
10. Maternal age (years)	30.82	5.06	0.11	−0.08	0.01	−0.19	−0.07	0.20*	0.46*	0.34*	0.16

Note.

^*p < .05.