Statistical Methods
EMA
Baseline characteristics were analyzed descriptively. Separate 1-way ANOVAs were used to estimate the effect of changing the reward structure (aim 1, reward RCT) or the schedule length (aim 2, schedule length RCT) on the response rate at burst 2 and burst 3, respectively. A sensitivity analysis was conducted using analysis of covariance to adjust for the response rate at burst 1 (ie, baseline).Secondary aim 3 was first analyzed using linear mixed model analysis with restricted maximum likelihood estimation to compare the overall response rate across the 3 bursts of EMA surveys following changes to the EMA implementation protocol (illustrated in 