A cohort study of possible risk factors for over-reporting of antihypertensive adherence.

"Competing interests None declared. Table 2Cross-tabulation of self-reported versus actual adherence1Actual Adherence2Self-Reported AdheranceCell counts (%)<1 Day/Week≥ 1 Day /WeekRow Totals (%)<1 Day/Week147 (51.4)78 (27.3)225 (78.7)≥ 1 Day/Week18 (6.3)43 (15.0)61 (21.3)Column Totals (%)165 (57.7)121 (42.3)286 (100.0)1Adherence defined as number of days when 1 or more doses were missed 2Electronically measured using MEMS-4"

"AcknowledgementsThe authors wish to acknowledge the valuable assistance and cooperation of Emily Cain, Michelle Cordeiro-Breault, Pamela Slavin, and the pharmacy staff and patients who participated in this study. This study was supported by research grants from the Agency for Health Care Policy and Research, #HS07821; National Heart, Lung, and Blood Institute, National Institutes of Health, #HL64273-01; and institutional support from the Harvard Pilgrim Health Care Foundation."