The total unstandardized phenotypic variance in alcohol consumption is quite low during epoch 1 (VP =0.27). This increases in epochs 2 and 3 (VP =1.59 and VP =2.83, respectively). Afterwards, the variance is relatively stable to epoch 6 (VP =2.85 in epoch 4, VP =2.75 in epoch 5, and VP =2.71 in epoch 6). Thus, while the sources of variance change over time (described above), the actual variance being accounted for changes as well.
