Stacked model comparisons revealed two significant differences in the magnitude of effects as well as two trends. The relationship between Time 1 parent-child relationship quality and cigarette use at Time 2 was significantly stronger for late maturing girls compared to early maturing girls (late, β = .25, p<.05; early, β = .03, p>.10; Δχ12 = 4.13, p<.05) and to girls who matured on time (on-time, β = .06, p<.05; Δχ12 = 4.38, p<.05). There was a trend such that the path between Time 1 alcohol use and parent-child relationship quality at Time 2 was stronger for late maturing girls compared to early (late, β = .18, p<.05; early, β = .04, p>.10; Δχ12 = 3.52, p<.06) and on-time maturing girls time (on-time, β = .06, p<.05; Δχ12 = 3.83, p=.05).
