Table 2.

Chi-squared Tests of Heavy Drinking and Regular Marijuana Use Trajectory Group Membership (Percent in Each Race)

	Group 1a	Group 2b	Group 3c	Group 4d	χ2
Heavy Drinking					53.83***
African American	51.1*	25.7	14.5	8.7*
White	24.6	29.9	14.7	30.8
Regular Marijuana Use					10.01*
African American	50.0	9.8	30.8*	9.4
White	62.1	8.5	19.0	10.4

^aGroup 1 = nonheavy drinkers/nondrinkers or nonregular users/nonusers.

^bGroup 2 = Adolescent-limited heavy drinkers or Adolescent-limited regular users.

^cGroup 3 = Late-onset heavy drinkers or Late-onset regular users.

^dGroup 4 = Early-onset heavy drinkers or Early-onset regular users.

^*p < .05,

^***p < .001 for overall chi-squared analysis as well as for the examination of standardized residuals within trajectory groups.