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The IGT net scores [(C′ + D′) – (A′ + B′)] by smoking status (non-current and current smokers) across first (1–40) and latter (41–100) blocks expressed as mean + S.E. after controlling for age, gender, school type, and school academic performance. Positive net scores reflect advantageous (non-impaired performance) while negative net scores reflect dis advantageous (impaired) performance. *Comparing between groups. *P < 0.05.
