Average Drive Time (Independent Variable)
EVENTS, EVENT
Average-drive time was calculated using the above data sources and methods. This was estimated from all census blocks within a 45-min drive of a testing site. This is a slightly different approach than during the optimization, where all population centers were assumed to be assigned to the nearest testing center. This conservative cutoff was required for us to utilize additional events in our analysis, particularly Mexican Consulate events which could occur in counties without other sites. Otherwise, all census blocks in the county would be assigned to one event regardless of their distance.