Evaluating process improvement effects on wait-time in substance abuse treatment programs via nonlinear quantile regression

Evaluate the effects of process improvement methods on wait-time across each study period (baseline, intervention, sustain) for patients entering substance abuse treatment programs participating in the NIATx 200 study through the use of quantile and least squares regression. Determine whether more intensive process improvement methods result in greater reductions in wait-time for patients entering substance abuse treatment programs participating in the NIATx 200 study.