. 2015 Apr 30;2:34–43. doi: 10.1016/j.ynstr.2015.04.002

Table 3.

Correlation matrix of maternal cortisol variables during the toy frustration and strange situation procedures.

	1. Baseline	2. 20 min	3. 40 min	4. Mean	5. AUC_G	6. AUC_I	7. Pk	8. Min	9. Max	10. RT	11. PkRT	12. Slp	13. Int	14. Slp_raw	15. % change
1.	.37	.73	.69	.90	.86	−.67	.88	.80	.90	−.66	−.12	−.56	.93	−.69	−.36
2.	.69	.31	.81	.93	.96	−.11	.85	.87	.85	−.24	.36	−.26	.77	−.24	.092
3.	.67	.86	.36	.89	.88	−.12	.76	.91	.78	−.02	.30	−.042	.65	−.04	.35
4.	.90	.91	.89	.40	.99	−.36	.97	.91	.96	−.38	.23	−.366	.88	−.38	.017
5.	.87	.94	.89	.99	.39	−.30	.96	.91	.95	−.35	.28	−.34	.86	−.35	.040
6.	−.65	−.058	−.089	−.35	−.28	.087	−.43	−.27	−.44	.92	.55	.76	−.68	.92	.64
7.	.92	.75	.71	.96	.95	−.47	.23	.79	.99	−.46	.30	−.42	.89	−.46	−.029
8.	.75	.89	.96	.90	.91	−.17	.77	.46	.77	−.27	.044	−.25	.76	−.27	.021
9.	.93	.79	.75	.95	.94	−.49	.99	.75	.32	−.47	.29	−.43	.89	−.47	−.036
10.	−.61	−.081	−.018	−.37	−.32	.93	−.48	−.10	−.50	.086	.50	.84	−.73	1.00	.77
11.	−.065	.41	.31	.27	.31	.47	.30	.18	.28	.34	.19	.38	−.006	.50	.70
12.	−.62	−.10	−.025	−.38	−.33	.91	−.48	−.12	−.50	.99	.35	.10	−.64	.84	.62
13.	.88	.61	.58	.82	.80	−.63	.86	.62	.87	−.77	.067	−.77	.24	−.73	−.300
14.	−.62	−.081	−.016	−.37	−.32	.93	−.49	−.10	−.50	1.00	.35	.99	−.77	.073	.77
15.	−.33	.23	.40	.063	.10	.62	−.045	.19	−.064	.58	.65	.60	−.23	.59	.094

Note: Correlations above the diagonal (shaded grey) refer to the Toy Frustration task, correlations below the diagonal refer to the Strange Situation procedure. Diagonal values (italicized, underlined) are test–retest correlations (across stressors). Correlations above .18 and .13 are significant at p < .01 and p < .05, respectively. Baseline = baseline cortisol value; 20-min = cortisol value at 20 min post-challenge; 40-min = cortisol value at 40 min post-challenge; mean = average cortisol value across samples; Pk = peak cortisol value; Min = minimum cortisol value; Max = maximum increase (peak minus minimum value); AUC_G = area under the curve with respect to ground; AUC_I = area under the curve with respect to increase; PkRT = peak reactivity; Slp = slope from baseline to 40 min value; Int = intercept of the regression line fitted through the raw cortisol data; Slp_Raw = slope of the regression line fitted through the raw cortisol data; % change = percent increase/decrease from 0 to 40 min.