Statistical Analysis
REGRESSION
Descriptive statistics were performed to characterize sociodemographic and clinical distributions for (1) all contacted patients, (2) registration status among contacted patients, and (3) consent status among registered patients. Patient characteristics were compared between (1) registered versus did not register and (2) consented versus did not consent using bivariate analysis. Categorical variables are presented as frequencies (percentages) and compared using chi-square tests. Continuous variables with skewed distributions are presented as medians (IQR). We used logistic regression to simultaneously adjust for all patient- and email campaign–related variables. We first performed a univariate (unadjusted) analysis for each variable (