three eigen values at 15 to 17 years (6.95, 1.12, 0.86), 18 to 21 years (5.56, 1.35, 0.80), and 22 to 25 years (5.85, 1.31, 0.73) followed by a comparison of the 1 and 2 factor solutions, suggested that a 2 factor solution provides a marginally better fit to the data. These 2 factors were interpreted as `General Peer Group Deviance' and `Peer Alcohol and Cigarette Use' dimensions. Between 18 to 25 years, the General Peer Group Deviance factor also included illicit drug items. The Peer Alcohol and Cigarette Use factor included items for alcohol related problems at all ages, as well as peers' use of cannabis at 21 to 25 years. Modeling the two latent factor scores separately revealed an almost identical pattern of results. Regardless of whether the PGD construct was divided into peers' licit versus illicit drug use, or modeled as a predominately delinquency factor, the CU→PGD causal model still provided the best fit to the data.
