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Covariates used to model the causal effect of sending a prompt versus not for each of the three aims.
| Aim | Covariates, X | Hypothesis test |
| Primary aim | Intercept | Intercept |
| Secondary aim 1 | Intercept (week in study) | Week in study |
| Secondary aim 2 | Intercept, day (weekday or weekend) | Day (weekday or weekend) |
