Table 4.

Cross-tabulations between trajectory groups

Variable	ALC 1 (n = 142)	ALC 2 (n = 166)	ALC 3 (n = 71)	ALC 4 (n = 81)	ALC 5 (n = 65)	MJ 1 (n = 215)	MJ 2 (n = 160)	MJ 3 (n = 126)	MJ 4 (n = 25)	HD 1 (n = 389)	HD 2 (n = 74)	HD 3 (n = 41)	HD 4 (n = 22)
ALC 1						49.3%	17.5%	4.8%	8.0%	34.4%	10.8%	0.0%	0.0%
ALC 2						34.4%	36.9%	22.2%	24.0%	32.4%	35.1%	36.6%	0.0%
ALC 3						6.0%	18.8%	18.3%	20.0%	11.8%	23.0%	7.3%	22.7%
ALC 4						8.8%	15.0%	25.4%	24.0%	13.4%	16.2%	34.1%	13.6%
ALC 5						1.4%	11.9%	29.4%	24.0%	8.0%	14.9%	22.0%	63.6%
MJ 1	74.6%	44.3%	18.3%	2.53%	4.6%					51.2%	18.9%	4.9%	0.0%
MJ 2	19.7%	35.3%	42.3%	29.6%	29.2%					32.6%	25.7%	29.3%	9.1%
MJ 3	4.2%	16.8%	32.4%	39.5%	56.9%					14.1%	44.6%	56.1%	68.2%
MJ 4	1.4%	3.6%	7.0%	7.4%	9.2%					2.1%	10.8%	9.8%	22.7%
HD 1	94.4%	75.4%	64.8%	64.2%	47.7%	92.6%	79.4%	43.7%	32.0%
HD 2	5.6%	15.6%	23.9%	14.8%	16.9%	6.5%	11.9%	26.2%	32.0%
HD 3	0.0%	9.0%	4.2%	17.3%	13.8%	0.9%	7.5%	18.3%	16.0%
HD 4	0.0%	0.0%	7.0%	3.7%	21.5%	0.0%	1.3%	11.9%	20.0%

Notes: ALC = alcohol trajectory group; ALC 1 = nil to low drinkers; ALC 2 = moderate drinkers; ALC 3 = experimenters; ALC 4 = late-onset heavy drinkers; ALC 5 = early-onset heavy drinkers; MJ = marijuana trajectory group; MJ 1= abstainers; MJ 2 = occasional users; MJ 3 = moderate users; MJ 4 = high users; HD = hard drug trajectory group; HD 1 = nil to low users; HD 2 = experimenters; HD 3 = late-onset heavy users; HD 4 = early-onset heavy users. Percentages were calculated using the number of individuals in each trajectory group who also fit criteria for a different trajectory. Denominators are provided at the top of the table. For example, 106 of the 142 individuals (75%) in trajectory group ALC 1 were also placed in trajectory group MJ 1. Percentages may not add to 100 because of rounding. Comparisons across subgroups are based on modal assignment of participants.