Comparison of pharmacy-based measures of medication adherence Full Text
BMC Health Services Research, 06/22/2012
Vollmer WV et al. – Many adherence measures require one, or sometimes two, dispensings in order to be defined. Since such measures assume all dispensed medication is used as directed, they have a built in upward bias that is especially pronounced when they are calculated over relatively short timeframes (< 9 months). Less biased measurement strategies that do not require a dispensing event are available, but require additional data to support their validity.