(c2=3%) and increased linearly with level of Quality, until, at the highest levels of Quality, a majority of the variance in Internalizing was due to shared environmental influences (c2=61%). Examination of the genetic correlations between Internalizing and Marital Quality showed perfect overlap (ra=1.0) across the level of Quality. The genetic influences on the Internalizing spectrum were the same genetic influences on Marital Quality at every level of Quality. There was an increasing association between the non-shared environmental influences on Marital Quality and Internalizing from low to high levels of Quality (see rE in Table 2). The non-shared environmental correlation between Quality and Internalizing increased from rE = −0.08 at low levels of Quality to rE = 0.18 at high levels of Quality.
