Development of a self-efficacy scale for mammography

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Abstract
Mammography screening has been demonstrated to decrease mortality from breast cancer. Although adherence rates have increased, there is still a need to increase annual screening. Self‐efficacy is a construct that has been found useful in predicting behaviors. Measurement of self‐efficacy needs to be specific to the behavior and to have good validity and reliability. The purpose of this study is to describe development of a self‐efficacy instrument to measure confidence in obtaining a mammogram. Bandura's model guided item development. Construct validity was measured using confirmatory factor analysis and logistic regression. Cronbach alpha was used to test internal consistency reliability. A Cronbach alpha coefficient of .87 was obtained. The mammography self‐efficacy scale evidenced content and construct validity. © Wiley Periodicals, Inc. Res Nurs Health 28:329–336, 2005