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Development of the Informed Choice in Mammography Screening Questionnaire (IMQ): factor structure, reliability, and
Maren Reder1,2, Eva-Maria Berens3, Jacob Spallek4
1Bielefeld University, School of Public Health, Department of Prevention and Health Promotion, Universitätsstraße 25, Bielefeld, 33615, Germany. maren.reder@uni-bielefeld.de.
BMC Psychology
|March 21, 2019
Summary
A new questionnaire (IMQ) was developed to measure informed choice in German mammography screening. While the attitude and knowledge components showed promise, further refinement of the norms and barriers scales is needed for comprehensive assessment.
Area of Science:
- Health Services Research
- Medical Sociology
- Psychometrics
Background:
- Informed choice is crucial for ethical and practical mammography screening participation.
- No validated instrument existed to measure informed choice in Germany's mammography screening program.
- This study aimed to develop and validate such an instrument.
Purpose of the Study:
- To develop the Informed Choice in Mammography Screening Questionnaire (IMQ).
- To provide initial evidence for the IMQ's factor structure, reliability, and validity.
- To assess informed choice levels and influencing factors in mammography screening.
Main Methods:
- The IMQ was developed based on qualitative interviews, literature review, and influencing factor studies.
- The questionnaire was administered to 17,349 women aged 50 in Westphalia-Lippe, Germany.
- Confirmatory factor analysis and item response theory analyses were used to evaluate psychometric properties.
Main Results:
- A response rate of 33.7% (5,847 returned questionnaires) was achieved.
- The attitude scale demonstrated a one-factor structure with good reliability (Cronbach's α=.793).
- The knowledge index showed 6 of 7 items were suitable; convergent and divergent validity were supported by confirmed hypotheses.
Conclusions:
- The IMQ is a multidimensional instrument for assessing informed choice in mammography screening.
- Further development is required for the norms and barriers scales.
- The IMQ can be utilized to evaluate informed choice and its determinants in screening programs.
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