Intervention Results
REGRESSION, SEPARATION
We first excluded patients who indicated that they were already screened or already have a preexisting appointment, as these patients were not eligible for screening. After the intervention, 88% (15/17) of patients in the phone intervention, 11% (2/18) of patients in the mail group, and 100% (21/21) in the mail and phone group booked an appointment with the teleophthalmology program compared to none in the Control Group (0/12). We ran a logistic regression model with whether a patient booked an appointment with the teleophthalmology program as the dependent variable and the types of intervention received (ie, mail, phone, or mail and phone) as the predictor factors. This analysis was done only on patients who were not screened at the time of intervention. As all patients in the mail and phone group booked an appointment, and none in the control had booked an appointment, the regression analysis could not be completed due to complete separation. We therefore ran one logistic regression model looking at the mail intervention and another model looking at the effect of the phone intervention. The logistic regression looking at the phone intervention showed that phoning patients positively predicted patients booking a teleophthalmology appointment (