in the magnitude and significance of the density effects between the two groups of children. Alcohol problem density was positively and significantly associated with BD (p=.02) and with CP (p=.00) in the less effective, but not in the more effective, parenting group (p=.67 for BD, and p=.36 for CP). This pattern of effects was not changed appreciably by controlling for demographic advantage. Magnitude of effects were small to medium in size (3% to 8% of the variance in BD and in CP accounted for, respectively, in the less effective parenting environment versus 0–1% in the more effective parenting environment).
