Construct Validity of Perceived Behavioral Control Instrument Among Patients with Coronary Artery Disease

Aan Nuraeni; Eka Sulistiani; Titin Sutini; Ristina Mirwanti; Ayu Prawesti Priambodo; Firman Sugiharto

doi:10.56303/jhnresearch.v4i3.503

Authors

Aan Nuraeni Department of Medical Surgical and Critical Care Nursing, Faculty of Nursing, Padjadjaran University, Indonesia
Eka Sulistiani Faculty of Nursing, Padjadjaran University, Indonesia
Titin Sutini Department of Mental Health Nursing, Faculty of Nursing, Padjadjaran University, Indonesia
Ristina Mirwanti Department of Critical Care and Emergency Nursing at Faculty of Nursing, Universitas Padjadjaran, Bandung, West Java, Indonesia
Ayu Prawesti Priambodo Department of Medical Surgical and Critical Care Nursing, Faculty of Nursing, Padjadjaran University, Indonesia
Firman Sugiharto Postgraduate Nursing Program, Faculty of Nursing, Padjadjaran University, Indonesia

Keywords:

Perceived behavioral control, Coronary artery disease, Rasch analysis, Construct validity, Psychometric instruments

Abstract

Perceived Behavioral Control (PBC) is a key construct in the Theory of Planned Behavior (TPB) that plays an important role in predicting adherence to lifestyle changes among patients with coronary artery disease (CAD). Although the role of PBC has been widely discussed in health behavior research, no instrument has been specifically developed and validated to measure PBC in patients with cardiovascular disease (CVD), particularly CAD. This study used the Rasch analysis approach to evaluate the construct validity and reliability of the Perceived Behavioral Control Scale Related to Cardiovascular Disease (PBCCVD). This was a cross-sectional study involving 92 post-hospitalization CAD patients selected through convenience sampling. The PBCCVD instrument consists of 22 items using a 4-point Likert scale, developed based on TPB theory and previous studies and validated by experts. Data analysis was conducted using Winsteps software, covering reliability, separation, fit statistics, and unidimensionality. The instrument demonstrated high reliability (Cronbach's alpha = 0.86; item reliability = 0.94; person reliability = 0.86). The item and person separation indices were 4.18 and 2.74, respectively. All items met the fit criteria. The explained variance was 34.9%, and the eigenvalue of the first contrast was 2.6054, indicating a possible additional subdimension. The PBCCVD is a reliable and reasonably valid instrument for measuring perceived behavioral control in CAD patients. Although there is an indication of another underlying dimension, the instrument can still be effectively used in both clinical and research settings.

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