Self-efficacy is a crucial factor in adopting mammography behavior. A reliable and valid instrument is necessary to measure self-efficacy among Iranian women.
The aim of this study is to translate the original version of Champion’s Mammography Self-efficacy Scale into Farsi and then to estimate the Farsi version’s reliability and validity.
In a cross-sectional study, 200 women 40 years or older who were referred to health centers in Iran were invited to complete the related questionnaires during an interview. Cronbach’s α coefficients and item-total correlations were measured to evaluate the reliability of the scales. Content and face validities were evaluated using the opinions of a panel of experts, and construct validity was estimated through applying confirmatory factor analysis. Logistic regression and χ2 tests were used to estimate theoretical relationships.
In terms of reliability, the internal consistency α was .904 and the test-retest reliability correlation over a 4-week period was 0.624. With regard to the confirmatory factor analysis, the proportion of χ2 to degrees of freedom was 0.394, giving a P value of .852 and a root-mean-square error of approximation less than 0.001 with confidence intervals of less than 0.001 and 0.018, with a comparative fit index of 1, normed fit index of 0.999, relative fit index of 0.993, and incremental fit index of 1.
The items that form the self-efficacy measurement scale in the Farsi version are highly reliable and valid.
Healthcare professionals and nursing health communities may apply the instrument to determine women’s self-efficacy and to plan appropriate educational interventions, aiming at promoting women’s mammography behavior.
Author Affiliations: Department of Health Education (Ms Hashemian, Dr Hidarnia, Dr Aminshokravi, and Dr Tavafian); Department of Midwifery (Dr Lamyian), Tarbiat Modares University, Tehran; Department of Pediatric, Sabzevar University, Sabzevar (Dr Hassanpour); and Department of Biostatistics, North Khorasan University, Bojnurd, Iran (Mr Akaberi).
The authors have no funding or conflicts of interest to disclose.
Correspondence: Farkhondeh Aminshokravi, PhD, Department of Health Education, Tarbiat Modares University, PO Box, Tehran 14155-4838, Iran (email@example.com).
Accepted for publication December 18, 2014.