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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: J Child Psychol Psychiatry. 2014 May 3;55(12):1363–1371. doi: 10.1111/jcpp.12240

Figure 1.

Figure 1

The interaction effect between stress and 5-HTTLPR genotype. Stress score on the X-axis is a composite of two questionnaires asking about ongoing long-term difficulties and stressful live events experienced in the past five years. ADHD severity on the Y-axis was measured through Conners questionnaires filled in by two informants. Whereas the S-allele carriers show a positive correlation between stress and ADHD severity, L-allele homozygotes do not. The shaded area indicates where the two genotypes differ significantly in severity (S>L, at stress levels higher than 0.06).