ANOVA and χ2 analyses confirmed that the AD and control groups were successfully matched on major demographic characteristics (see Table 1). Within both the AD and control groups, some participants had experimented with tobacco and cannabis (see Table 1), and several control participants had experimented with alcohol. Although groups did not differ in the age of initiating experimenting with various substances, groups did differ in terms of the volume of tobacco and other substance use (see Table 1). For instance, many more controls than AD adolescents had never used cigarettes (χ2(1) < 6.24, p = .012) or cannabis (χ2(1) = 15.44, p < .001). Average lifetime tobacco and cannabis usage was much higher in the AD group than in the control group (Welch’s F (1, 25.085) = 5.59, p = .026; Welch’s F (1, 25.235) = 11.26, p = .003, respectively).
