Table 1.

Bivariate correlations, means, and standard deviation for study variables among boys and girls

Variable	1	2	3	4	5	6	7	8	9	10	11	12	13	14
RSA Baseline	–	0.49	−0.64*	−0.02	−0.15	−0.19	−0.26	−0.24	0.08	0.09	0.03	0.25	0.13	0.11
RSA Task	−0.04	–	0.37	0.51	−0.00	0.02	0.08	−0.06	−0.28	0.03	−0.39	0.14	0.00	−0.12
RSA Change	−0.78*	0.66*	–	0.40	0.19	0.26	0.40	0.24	−0.35	−0.06	−0.41	−0.19	−0.18	−0.22
RSA Emotional Task	0.14	0.37	0.13	–	0.05	0.04	−0.04	−0.08	−0.03	−0.17	−0.16	−0.04	0.01	0.01
PEP Baseline	−0.07	−0.04	0.06	0.32	–	0.98*	0.67*	0.97*	−0.11	0.16	−0.21	0.41	0.31	0.20
PEP Task	−0.05	−0.04	0.02	0.34	0.98*	–	0.78*	0.98*	−0.18	0.12	−0.27	0.34	0.23	0.15
PEP Change	0.13	0.01	−0.18	0.13	−0.11	0.08	–	0.69*	−0.37	−0.03	−0.43	0.01	−0.09	−0.07
PEP Emotional Task	0.01	0.06	0.05	0.33	0.98*	0.98*	0.04	–	−0.14	0.08	−0.16	0.39	0.31	0.21
Mean of Blocks	−0.40	0.37	0.52	0.12	−0.10	−0.16	−0.28	−0.23	–	0.54*	0.93*	−0.05	0.23	0.33
Difference score for block 1	−0.52	0.25	0.60*	0.22	0.03	−0.05	−0.23	−0.08	0.37	–	0.34	0.16	0.25	−0.04
Difference score for block 5	−0.16	0.13	0.16	−0.02	−0.32	−0.32	−0.15	−0.42	0.87*	0.10	–	−0.19	0.13	0.31
ADHD–I (CSI) Symptoms	−0.11	−0.12	0.11	0.32	0.41	0.28	−0.45	−0.42	−0.16	0.25	−0.31	–	0.82*	0.51*
ADHD–H (CSI) Symptoms	−0.03	0.07	0.12	0.25	0.42	0.35	−0.16	−0.47	−0.35	−0.02	−0.38	0.81*	–	0.76*
ODD (CSI) Symptoms	−0.02	−0.12	−0.01	−0.15	0.29	0.19	−0.31	0.22	−0.15	−0.04	−0.14	0.55*	0.59*	–
Boys: M	3.86 a	4.33	0.43	3.71	99.25	101.13	1.44	101.24	0.31	−0.04	0.50	10.70 b	9.65	6.34
SD	0.65	0.53	0.84	0.80	13.90	13.30	2.67	13.80	0.37	0.36	0.59	5.60	7.35	4.60
Girls: M	4.25a	4.50	0.20	3.89	97.88	97.92	0.04	96.78	0.22	−0.11	0.43	5.93 b	7.07	5.48
SD	0.56	0.45	0.52	0.66	8.87	10.70	2.50	10.31	0.50	0.54	0.64	4.58	7.46	5.92

Correlations for boys are below the diagonal. Correlations for girls are in italics and above the diagonal.

RSA Respiratory sinus arrhythmia, PEP pre-ejection period, Task mean across all four challenges, Change change from baseline to task, Mean of Blocks mean of difference scores across decision-making blocks, CSI Child Symptom Inventory-4

^*p<0.01

^aGirls>boys (p<0.05)

^bBoys>girls (p<0.05)