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Coronary heart disease knowledge test: developing a valid and reliable tool
M M Smith1, V L Hicks, V H Heyward
1Weber State University in Ogden, Utah.
Insights
A new 40-question test effectively measures coronary heart disease (CHD) knowledge and risk factors. Patients in cardiac rehabilitation programs (CRP) scored significantly higher, confirming the test
Area of Science:
- Cardiology
- Health Education
- Psychometrics
Background:
- Assessing patient knowledge of coronary heart disease (CHD) and its risk factors is crucial for effective management.
- Existing tools may lack validated measures for CHD knowledge, particularly concerning risk factors and rehabilitation participation.
- Cardiac rehabilitation programs (CRP) aim to improve patient outcomes through education and lifestyle changes.
Purpose of the Study:
- To develop and validate a reliable written test to assess knowledge of coronary heart disease (CHD) and its risk factors.
- To evaluate the test's validity and reliability using established psychometric methods.
- To determine if participation in a cardiac rehabilitation program (CRP) correlates with higher CHD knowledge scores.
Main Methods:
- An 80-question multiple-choice test was developed and refined by expert review and pilot testing.
- Content validity was ensured through expert ratings; item discrimination and internal consistency were assessed using point-biserial correlation and Kuder-Richardson formula 20 (KR-20).
- The final 40-question test was administered to 93 male CHD patients, categorized into treatment (CRP participants) and control (non-participants) groups.
Main Results:
- The final 40-item test demonstrated good validity, with item difficulty ratings ranging from 0% to 98% (average 63%).
- Internal consistency reliability was high at 0.84 (KR-20).
- Construct validation showed significantly higher scores for the treatment group (CRP participants) compared to the control group (t = 3.51, p < 0.01).
Conclusions:
- The developed 40-question test is a valid and reliable instrument for assessing patient knowledge of coronary heart disease and its risk factors.
- The test effectively differentiates between patients with varying levels of engagement in cardiac rehabilitation.
- This tool can be valuable in evaluating the effectiveness of patient education within cardiac rehabilitation programs.
Abstract:
This study tested the validity and reliability of a written test designed to assess knowledge of coronary heart disease (CHD) and its risk factors. The subjects were 93 males diagnosed with CHD. Subjects were classified into a treatment group (n = 48) or a control group (n = 45) based on whether or not they participated in a cardiac rehabilitation program (CRP). An additional 38 subjects were used to pilot test the original form of the knowledge test, which consisted of 80 multiple-choice questions. Content validity was established by a five-member jury of cardiac rehabilitation experts. Each question was rated using a Likert-type scale. Questions that did not receive an average rating of at least four were eliminated. The revised form was pilot tested for validity and internal consistency with the discrimination index (point biserial correlation coefficient) and the Kuder-Richardson formula 20 (KR-20). Questions with a discrimination index of less than 0.14 were eliminated; thus, the final form of the test consisted of 40 questions. Validation of this test yielded difficulty ratings (DRs) between 0 percent and 98 percent, with an average DR of 63 percent. Construct validation indicated that the average test score of subjects participating in a CRP was significantly higher than that of non-participants (t = 3.51, df = 91, p less than or equal to 0.01). The internal-consistency reliability of the test was 0.84. The results indicate that this test is a valid and reliable tool for assessing patients' knowledge of CHD and its risk factors.
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