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SEM of longitudinal effect of COMT rs737865 on cognition at ages 8 and 15 years in boys (n = 1134, (a) and girls (n = 1157, (b); word = word reading, reading = reading comprehension, picture = picture intelligence, AH4 verbal = AH4 verbal ability, AH4 non-v = AH4 non-verbal ability; coefficients with p < 0.05 are in bold. For factor loadings, both standardised and unstandardised (in brackets) coefficients are presented.
