Psychometric Testing of the Self-Care of Coronary Heart Disease Inventory (SC-CHDI)

Victoria Vaughan Dickson, Christopher Lee, Karen S. Yehle, Ana Mola, Kenneth M. Faulkner, Barbara Riegel

Research output: Contribution to journalArticle

6 Scopus citations


Although coronary heart disease (CHD) requires a significant amount of self-care, there are no instruments available to measure self-care in this population. The purpose of this study was to test the psychometric properties of the Self-Care of Coronary Heart Disease Inventory (SC-CHDI). Using the Self-Care of Chronic Illness theory, we developed a 22-item measure of maintenance, management, and confidence appropriate for persons with stable CHD and tested it in a convenience sample of 392 adults (62% male, mean age 61.4±9.6 years). Factorial validity was tested with confirmatory factor analysis. Convergent validity was tested with the Medical Outcomes Study MOS-SAS Specific Adherence Scale and the Decision Making Competency Inventory (DMCI). Cronbach alpha and factor determinacy scores (FDS) were calculated to assess reliability. Two multidimensional self-care scales were confirmed: self-care maintenance included "consultative behaviors" (e.g., taking medicines as prescribed) and "autonomous behaviors" (e.g., exercising 30minute/day; FDS=.87). The multidimensional self-care management scale included "early recognition and response" (e.g., recognizing symptoms) and "delayed response" (e.g., taking an aspirin; FDS=.76). A unidimensional confidence factor captured confidence in each self-care process (α=.84). All the self-care dimensions were associated with treatment adherence as measured by the MOS-SAS. Only self-care maintenance and confidence were associated with decision-making (DCMI). These findings support the conceptual basis of self-care in patients with CHD as a process of maintenance that includes both consultative and autonomous behaviors, and management with symptom awareness and response. The SC-CHDI confidence scale is promising as a measure of self-efficacy, an important factor influencing self-care.

Original languageEnglish (US)
JournalResearch in Nursing and Health
StateAccepted/In press - 2016



  • Adherence
  • Coronary heart disease
  • Instrument development
  • Measurement
  • Self-care

ASJC Scopus subject areas

  • Nursing(all)

Cite this

Vaughan Dickson, V., Lee, C., Yehle, K. S., Mola, A., Faulkner, K. M., & Riegel, B. (Accepted/In press). Psychometric Testing of the Self-Care of Coronary Heart Disease Inventory (SC-CHDI). Research in Nursing and Health.