This appendix provides additional details on the underlying data, statistical models, and results presented in The Big Lift Evaluation: Research Findings Five Years In (Gomez, Cannon, and Bongard, 2021), the fourth report in a series in which we evaluate The Big Lift™ (hereafter referred to as Big Lift). We first describe how we created each control and outcome variable and its source (e.g., parent report), followed by an overview of the regression models we employed. We then provide a full set of results, including all models presented in the full report and supplemental analyses. (author abstract)