Daily stress reactivity and serotonin transporter gene (5-HTTLPR) variation: internalizing responses to everyday stress as a possible transdiagnostic phenotype.

Regarding the interaction of genotype and daily life stress in predicting daily externalizing symptoms, the omnibus significance test of the two genotype contrasts was not indicative of a G × E effect ( χ 2 (2) = 2.89, P = 0.23), although the comparison between SS and LL group slopes was marginally significant (see Table 2 ).

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