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Western Journal of Nursing Research
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Mediator Analysis of Moms on the Move

Nancy L. Fahrenwald

College of Nursing, South Dakota State University

Jan R. Atwood

College of Nursing, Professor, College of Medicine, University of Nebraska Medical Center

David R. Johnson

Social Science Research Institute, Pennsylvania State University

This study examined whether improvements in physical activity discovered in a test of Moms on the Move were mediated by the behavioral constructs from which the intervention was derived. Identifying mediator variables is vital for intervention planning. The intervention was derived from the Transtheoretical Model (TTM) of behavior change and promoted moderately intense activities like walking. Sedentary mothers with children enrolled in the Women, Infants, and Children program (N = 44) were randomly assigned to the experimental intervention or attention control. Large effect sizes were reported for improvements in physical activity and changes in TTM constructs. This study examined whether the physical activity improvements were mediated by the behavioral constructs. Statistical analyses used bivariate correlation coefficients and two-stage multiple linear regression. These exploratory findings did not support the hypothesis that increased physical activity, which was associated with the experimental intervention, was mediated by the TTM constructs.

Key Words: mediation • physical activity • intervention • women • mothers • Women, Infants, and Children (WIC) program

Western Journal of Nursing Research, Vol. 27, No. 3, 271-291 (2005)
DOI: 10.1177/0193945904273275
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