This appendix includes several kinds of supplementary material. First, it presents information on sampling and data- collection procedures used in the Monitoring the Future project. Second, it briefly describes the samples utilized in these analyses in terms of the respondents' patterns of post-high-school experiences (education, work, living arrangements, marriage, and parenthood) during the first 14 years after high school. Third, it provides a description of the multiple classification analysis (MCA) procedures and the reporting format, along with guidelines for interpreting the results.
The appendix also provides a number of supplementary tables, including: (a) distributions of respondents in the various post-high-school experiences by modal age (Tables A.l.l-A.1.5); (b) response scales and question wordings (Table A. 1.6); (c) product—moment correlations among drug use variables and mediating variables for three age bands (Tables A.2.1-A.2.3); (d) numbers of cases in various categories (Table A.3); and (e) multivariate analysis (MCA) findings (Tables A.4.1-A.7.6).
A separate technical report spells out the design and procedures for the Monitoring the Future project and includes considerable detail on sampling methods, response rates, measurement content, and issues of validity in self-reports of drug use (Bachman, Johnston, &O'Malley, 1996). The annual monographs on trends in drug use and related factors (e.g., Johnston et