The average age for first intercourse was 15.15 years of age (SD = 1.57). For the nondrinkers, the average age of first intercourse was 15.16 years of age (SD = 1.49), 14.71 years (SD = 1.63) of age for the early-onset drinkers, and 15.22 years of age (SD = 1.53) for the late-onset drinkers. The mean ages for cigarette smoking were as follows; 12.57 years of age among the nondrinkers (n = 72), 10.93 years of age among the early-onset drinkers (n = 41), and 13.33 years of age among the late-onset drinkers (n = 219).
