FIGURE 1.

A, At age 11 years, the highest levels of delinquency are reported by early-maturing girls with deviant friends, but the effects of best friend’s deviance among early-maturing girls dissipate by age 16. B, Early puberty and best friend’s deviance are independently associated with physical aggression at age 11; the effect of early puberty lessens over time. C, D, Best friend’s deviance is related to more relational (C) and nonphysical (D) aggression at age 11, but the differences diminish by age 16 due to faster increase in aggression among girls with nondeviant friends. For all problem behaviors, 0 indicates sample mean at age 11; all values are expressed as SDs from this mean. Best friend’s high/low deviance is 1 SD above/below the mean. Values are estimated from models using all girls (N = 2607).