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Study objectives: To identify the predictors of medication adherence in patients with COPD and contrast the health beliefs, experiences, and behaviors of COPD patients self-reporting good adherence with those of patients reporting suboptimal adherence to their medications.

Design: Cross-sectional self-administered questionnaire.

Setting: Ambulatory care.

Participants: Patients with chronic respiratory ailments identified through respiratory support groups and from a pulmonary rehabilitation database.

Measurements and results: A 30-item questionnaire comprising items pertaining to health beliefs, experiences, and behaviors along with a valid self-reported measure of adherence-the medication adherence report scale (MARS)-was administered to 525 ambulatory patients with chronic lung conditions. A total of 276 usable responses were received (52.6%). The mean age of the respondents was 71 years, and there …