Table 1.

Means (M) and Standard Deviations (SD) of Peer Attachment, Behavioral and Neural Correlates of Risk Processing, and Control Variables.

	T1				T2				T3				T4
	Male		Female		Male		Female		Male		Female		Male		Female		ICC (95 % CI)
	M	SD	M	SD	M	SD	M	SD	M	SD	M	SD	M	SD	M	SD
Age	14.19	0.52	14.06	0.55	15.13	0.52	14.98	0.57	16.15	0.54	16.01	0.57	17.08	0.53	16.91	0.56	–
Peer attachment	3.88	0.51	4.12	0.59	3.99	0.45	4.14	0.58	4.08	0.45	4.14	0.50	4.11	0.41	4.07	0.67	.73 (.65–.79)
Risk-preference	0.72	0.49	0.88	0.93	0.54	0.48	0.66	0.87	0.59	0.91	0.42	0.39	0.37	0.33	0.45	0.90	.46 (.31–.58)
Right insula	0.03	0.05	0.03	0.05	0.46	0.67	0.47	0.58	0.75	1.04	0.54	0.74	0.61	1.09	0.61	0.77	.52 (.37–.63)
Left insula	0.03	0.05	0.04	0.05	0.41	0.68	0.38	0.52	0.60	0.99	0.42	0.78	0.53	1.15	0.56	0.74	.46 (.32–.58)
dACC	0.04	0.05	0.03	0.04	0.44	0.75	0.39	0.54	0.73	1.05	0.57	0.87	0.55	1.04	0.68	0.94	.49 (.35–.61)
Control variables
PD	2.62	0.51	3.24	0.44	2.83	0.38	3.45	0.44	2.99	0.36	3.67	0.31	3.19	0.40	3.82	0.33	.81 (.64–.88)
Parental attachment	4.10	0.48	4.25	0.48	4.02	0.56	4.16	0.58	4.13	0.50	4.10	0.61	4.08	0.53	4.14	0.59	.86 (.82–.89)

Note. Bold entries indicate significant differences between males and females at p < .05. T1-4 = time point 1–4.

ICC = intra-class correlation coefficient; CI = confidence interval; dACC = dorsal anterior cingulate cortex; PD = pubertal development.