We next re-ran our primary G × E analyses using different transformations and measures of child CP. The linear C moderation-only model provided the best fit to the Blom-transformed CP data by all four fit indices (results available on request). Moreover, the C moderator was estimated to be 0.09 (p < 0.05), whereas the A and E moderators (when estimated) ranged from −0.02 to 0.01. We then re-ran the analyses using each participant’s maximum CP score according to any one informant as an index of his or her level of CP. There was again evidence of significant environmental, but not genetic, moderation of CP by conflict. The genetic moderator was estimated at −0.01 (n.s.), whereas the shared environmental moderator was estimated at 0.12 (95% CI 0.07–0.17, p < 0.05). Such findings are fully consistent with those reported above, implying that our results are robust to the specific operationalization of CP.
