Table 1.

Participant characteristics

	All (n=194)		Boys (n=89)		Girls (n=105)
	n	%	n	%	n	%
Family SES index
Low	43	22.2	13	14.6	30	28.6
Middle	108	55.7	55	61.8	53	50.5
High	43	22.2	21	23.6	22	21.0
Right hand as dominant hand	178	91.8	80	89.9	98	93.3
Plays video game >1 hour/day	37	19.1	19	21.4	18	17.1
Smoking	0	0	0	0	0	0
Alcohol consumption	3	1.6	2	2.3	1	1.0
Age at neuromotor test (years; mean, SD)	12.0	±0.9	11.9	±0.9	12.1	±0.9
BMI (kg/m2; mean, SD)	20.4	±3.8	20.2	±3.9	20.5	±3.8