Table 1.

Descriptive statistics and bivariate correlations for key study variables.

Variable (units/range)	N (%)/M (SD)	2	3	4	5	6	7	8	9	10	11
Controls
1. Sex (Male)	73 (59%)	.07	−.08	.09	−.04	.02	.20*	.10	.13	.13	.20*
2. Age (Months)	25.21 (9.67)	-	.04	.15	.02	.10	.00	−.20*	−.22*	−.13	−.12
3. Time (hrs post 7am)	4.83 (2.82)		-	−.12	−.06	.19*	−.30**	−.29**	−.29**	−.24*	−.17
4. Last Task (0–6)	3.91 (2.19)			-	.05	.10	−.01	−.18	−.01	−.03	−.06
Predictors
5. Income (0–5)	1.33 (1.23)				-	.24**	−.06	−.05	−.07	.09	−.08
6. Pos Parenting (1–5)	2.95 (.80)					-	−.22*	−.09	−.22**	−.26**	−.30**
Outcome variables: salivary cortisol across a structured stress paradigm (μg/dL)
7. SR 1 (0 m)	.18 (.15)						-	.37***	.43***	.44***	.64***
8. SR 2 (18 m)	.15 (.11)							-	.64***	.46***	.35***
9. SR 3 (32 m)	.14 (.13)								-	.48***	.58***
10. SR 4 (61 m)	.13 (.12)									-	.79***
11. SR 5 (75 m)	.12 (.12)										-

Note. Time – time of the first sample in hours, centered at 7 am; Last Task – the last stress paradigm task the child completed (0 = all task completed, 3 = ‘scary mask’ task completed but not the ‘mechanical toy’ task, and 6 = no task completed); Income – categorical ratings based on the family income relative to the federal poverty line (FPL) (0 = 50% of the FPL and 5 = 300% of the FPL); Pos Parenting – positive parenting behaviors observed during the ‘3-bag’ task; SR1-SR5 –the average salivary cortisol values from each assessment time point.

^*p < .05,

^**p < .01,

^***p < .001