Table 4.

Study 2 fMRI task-performance data at baseline and follow-up

Variable	Continuous nondrinkers (n = 20) M (SD)	Heavy drinking transitioners (n = 20) M (SD)
Baseline
2-dot accuracy, %	91.01 (8.24)	91.18 (11.27)
6-dot accuracy, %	77.93 (12.24)	79.40 (8.07)
2-dot reaction time, ms*	2,596.89 (217.96)	2,436.22 (223.73)
6-dot reaction time, ms	2,714.00 (230.55)	2,599.56 (214.30)
Follow-up
2-dot accuracy, %	96.11 (4.50)	94.86 (4.95)
6-dot accuracy, %	84.04 (8.35)	80.16 (10.27)
2-dot reaction time, ms	2,213.89 (125.95)	2,214.10 (96.40)
6-dot reaction time, ms	2,369.32 (147.57)	2,405.50 (104.57)

Notes: Significant Time × Drinking Status interactions were observed in 2-and 6-dot reaction time. For both interactions, adolescents who transitioned into heavy drinking had attenuated decreases in reaction time at follow-up compared with continuous nondrinkers. fMRI = functional magnetic resonance imaging.

^*Continuous nondrinkers ≠ heavy drinkers, p < .05.