Table 1.

Summary of exploratory findings.

	70% discovery/30% test		50% discovery/50% test		30% discovery/70% test
	# positively associated clusters (split%)	# negatively associated clusters (split%)	# positively associated clusters (split%)	# negatively associated clusters (split%)	# positively associated clusters (split%)	# negatively associated clusters (split%)
Age (years) n-total = 420	0	586 (100%)	0	534 (87%)	0	322 (57%)
Delay discounting (AUC-40 K) n-total = 418	202 (64%)	0	101 (37%)	0	95 (29%)	0
Relational task (ACC %) n-total = 412	0	27 (19%)	0	18 (13%)	1 (1%)	31 (15%)
Agreeableness n-total = 418	0	55 (35%)	0	64 (32%)	0	24 (16%)
Openness n-total = 418	0	30 (13%)	0	71 (39%)	0	51 (26%)
Conscientiousness n-total = 418	76 (34%)	0	43 (18%)	0	24 (13%)	0

For each discovery sample size, the number of clusters in which cortical thickness is positively or negatively associated with the tested phenotypic or psychological score is reported. The number of splits (out of 100) in which the clusters were detected are noted in parentheses (i.e. % of splits with at least one significant cluster [in the respective direction]).

AUC area under the curve, ACC accuracy.