Table 1.

Sample descriptives.

Measure	Totala
Sample size	82 (43 female)
Age at T1 (years)	16.45; 0.53; 14.95–17.94
Age at T2 (years)	18.79; 0.47; 17.28–19.96
Interscan interval T1–T2 (years)b	2.34; 0.21; 1.67–2.88
Estimate Full Scale IQ	112.10; 11. 53; 82–136
MAAS score	4.30; 0.807; 2.40–5.93
Percentage Low SESc	58.76

Note: IQ and MAAS scores taken at T2.

^aValues represent mean; standard deviation; range.

^bDelay between baseline and follow-up MRI scan.

^cData missing for one female participant.