Access
The distance between individuals and the nearest district health clinic is our measure of access to a COVID-19 vaccine. This is first based on the geo-location of individuals. In most cases, we could identify the individual’s geo-location based on the geo-location of the tablet when phase I treatment intervention was conducted with the treated individuals and when phase III was conducted with the non-treated individuals. Secondly, we collected the geo-location of all clinics in the six Ghana districts that were sampled in this trial. Using the R function distHaversine, we calculated the shortest distance between each participant and each of these district health clinics