Extended Data Table 2.

Regression-estimated effects of text reminders on appointments and vaccinations at UCLA Health in the first RCT

Regression-estimated effects of receiving a text reminder (altogether or broken down by reminder type) as well as the effect of adding an intervention (either ownership framing or video-based information intervention) to the reminder on appointments and vaccinations at UCLA Health in the first RCT. The two outcome measures are whether participants scheduled an appointment to get the first dose of the COVID-19 vaccine at UCLA Health from 15:00 h on the first reminder date to 23:59 h on the fifth day following the first reminder date  (‘Appointment at UCLA (Within Six Days)’) and whether participants obtained the first dose of the COVID-19 vaccine at UCLA Health within four weeks of the first reminder date (‘Vaccinated at UCLA (Within Four Weeks)’). Supplementary Tables 3–5, 11, 12 provide results of complete OLS regressions that are used to estimate the effects reported here. All P values are two-sided without multiple comparison adjustments. For the effect of adding ownership framing to the reminder, the P value with a Holm–Bonferroni correction is < 0.002 for both outcome measures. Supplementary Information section 1.3 describes how we handle multiple comparisons. ‘N’ refers to the number of observations in each regression.