Due to attrition in the sample over time, we conducted a complete case analysis of only those respondents who completed all four waves of the study with complete data. Results are provided in Online Tables 2 and 3. Results remain largely unchanged among those who completed all four waves. One notable difference is that the difference-in-difference estimates for the association between race and marijuana use among women are no longer significant; however, the results are in the same direction, both suggesting cross-over in use across development.
