TABLE 1.

PARTICIPANT CHARACTERISTICS

CHARACTERISTIC	GENOTYPE GROUP
	AA	Gcar
Number of individuals	93	23
Male, No	50	13
Handedness, No
L	17	5
R	76	18
IQ, mean (SD)	113 (11.8)	109 (14.6)
VIQ	112 (12.1)	109 (14.8)
PIQ	112 (12.5)	105 (14.9)
SES	41 (18.5)	49 (20.9)
Total number of scans	243	53
Number of scans, No
1 scan	21	7
2 scans	22	6
≥3 scans	50	10
Age at each scan in years, mean (SD)
1st scan	10.9 (3.6)	11.9 (4)
2nd scan	12.9 (3.4)	14.7 (4.6)
3rd scan	15.5 (3.4)	15.9 (4.1)
4th scan	18.1 (2.5)	19.3 (1.8)
Age distribution of scans, years
Mean (SD)	13.4 (4.3)	14.0 (4.5)
Range	5.6–23.5)	5.3–23.5