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Chunk #20 — RESULTS — Twin models — Moderating Influences

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Peer substance involvement modifies genetic influences on regular substance involvement in young women.
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Results from the moderation model are presented in Table 3 and are graphically depicted in Figure 2 (Panel A). There was significant evidence for G x E additive genetic influences on RSI increased as levels of peer deviance increased. There was no evidence for shared environmental factors nor for any moderating influence on them (Δχ2=0.58 for 2 df). However, non-shared environmental factors on RSI were significantly moderated by PSI – as peer deviance increased, the role of non-shared environmental influences on RSI also increased. This implies an overall increase in RSI variance in those with higher PSI scores. Finally, it was also noted that PSI increased overall levels of RSI (B=0.39, 95% C.I. 0.34–0.43).