Chunk #12 — Materials and methods — Study 2 — Participants and procedures

Source

Differential susceptibility in youth: evidence that 5-HTTLPR x positive parenting is associated with positive affect 'for better and worse'.

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Youth completed the Positive Affect and Negative Affect Scale for Children and provided a DNA sample, which was genotyped with exactly the same procedures as study 1. The 5-HTTLPR polymorphisms were in the Hardy–Weinberg equilibrium. Genotype frequencies were 20 L'L', 53 L'S' and 27% S'S'. Genotype frequencies did not vary significantly by race (χ2=0.001, P=0.98) or sex (χ2=1.56, P=0.21).