This study is a prospective longitudinal survey. Patients who met the established criteria were recruited from a cardiology unit at a tertiary medical center in China between October 2017 and April 2018, and they were followed up 1 month after hospital discharge. The sample size was calculated based on 52 entries in the Perceived Knowledge Scale for CAD (PKS-CAD), which comprised the most items in these questionnaires,16 and the sample loss of 10%-20%17 was considered. Moreover, in order to ensure sufficient sample size, a total of 300 questionnaires were distributed. Therefore, 300 patients with CAD who underwent PCI were recruited to participate using convenience sampling. Patients were included if they (1) were aged ≥18 years; (2) had a history of CAD ≥ 3 months; (3) accomplished Phase I of CR after PCI and was allowed to enter the early stage of Phase II in home- and exercise-based CR by a CR specialist; and (4) had no language communication barriers and were willing to participate in this study. Patients were excluded if they (1) had complications (severe aortic stenosis, severe pulmonary hypertension, valvular heart disease, and hypertrophic obstructive cardiomyopathy) or other diseases that impede exercise or (2) were suffering from disturbance of consciousness or mental illness.

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