Total genetic effects for alcohol intoxication did not reveal a clear trend of increasing or decreasing across development. Total genetic effects decreased from age 13–14 to age 16–17 (55% v. 44%). However, these effects increased to 58% at age 19–20. Similar to smoking, however, genetic effects became more specific across development, with common genetic estimates decreasing and alcohol intoxication-specific genetic estimates increasing. Finally, examining the cross-time continuity of the alcohol-specific genetic effects indicated that alcohol intoxication had the lowest continuity, with 87% of the specific genetic effects at 19–20 being new.
