Table 2 Descriptive statistics and correlations for behavioral variables in the full sample (n = 536).

Variables	Cat. 1	%	Cat. 2	%	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
(1) Sex	Male	56.3	Female	43.7
(2) Scanning site	F	17.7	US	82.3	0.02
(3) ADHD	no	78.4	yes	21.6	–0.18**	0.24**
(3) ADHD	Mean	SD	Min	Max
(4) Age	10.58	1.60	7.50	15.00	–0.05	0.28**	0.03
(5) Verbal IQ	0.00	1.00	–3.45	2.37	0.03	0.00	–0.10*	−0.07
(6) Non-verbal IQ	0.00	1.00	–3.46	2.04	0.01	0.00	–0.10*	–0.12**	0.41**
(7) Arithmetic	0.00	1.00	–3.01	2.49	–0.01	0.00	–0.18**	–0.05	0.43**	0.46**
(8) Vocabulary	0.00	1.00	–2.49	2.65	0.02	0.00	–0.08	–0.11**	0.68**	0.44**	0.44**
(9) Reading	0.00	1.00	–3.70	3.22	0.12*	0.00	–0.14**	–0.09*	0.35**	0.31**	0.40**	0.40**

Pearson correlation, *p ≤ 0.05, **p ≤ 0.01. Scores of IQ verbal, IQ non-verbal, vocabulary, reading, and arithmetic are z-standardized because different measurements were used in the six datasets (see Table S1). Cat. 1 = Category 1, Cat. 2 = Category 2. F = France, US = United States. Significant (p < 0.05) correlations are in bold.

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