Table 1.

Description of visit adherence metrics

Metric	Description
Total number of missed visits	Tally of unattended visits in study period. If patients were listed as lost to follow up, every 4-week interval from the last attended visit was counted
Visit constancy	Percentage of 3-month periods (quarters) with at least 1 attended visit
Avg days	Average interval between attended visits (in days)
Max days	Maximum interval between attended visits (in days)
Avg missed days	Average unintended interval between attended visits (in days). This only includes visit intervals with at least one missed visit.
Max missed days	Maximum unintended interval between attended visits (in days). This reflects the longest single interval with at least one missed visit.
Miss index	Avg missed days / total number of attended visits (In missed days/visit)