Evaluating motivational interviewing to promote breastfeeding by rural Mexican-American mothers: the challenge of attrition.

Although most Hispanic/Latino-American mothers initiate breastfeeding, duration and exclusivity of breastfeeding remain low. We explored whether a motivational interviewing (MI) intervention could help rural Mexican-American mothers continue breastfeeding. We used a two-group (MI intervention n = 26, attention control [AC] n = 27) repeated measures experimental design. Assessments and interventions occurred at 3 days, 2 weeks, and 6 weeks postpartum (time points when mothers are particularly vulnerable to discontinuing breastfeeding), with a final phone assessment at 6 months postpartum. We collected demographic data and measured intent to breastfeed for 6 months (intent question), self-efficacy (Breastfeeding Self-Efficacy Scale-Short Form), and collected breastfeeding information (breastfeeding assessment questionnaire). Independent t-tests and Mann Whitney U non-parametric tests were used to evaluate group differences (α = 0.05). High levels of attrition by week 6 impaired our ability to evaluate the potential of our MI intervention. No significant differences were found between groups for any of the outcome variables (intent to breastfeed for 6 months, breastfeeding self-efficacy, and duration of breastfeeding). Though the mothers intended to breastfeed for 6 months and were confident in their ability to do so, most did not breastfeed for 6 months. At 6 months, mothers receiving the MI intervention had breastfed an average of 90 days compared to 82 days for those receiving the AC sessions and 22% of the mothers in each group were still breastfeeding at some level. Because of the impact of attrition during this study, we discuss factors that contributed to attrition and approaches to lessen this problem in future studies. Such efforts may require a greater investment of time and resources and should be budgeted accordingly. Culturally appropriate interventions are needed to help rural Mexican-American mothers meet their breastfeeding goals, thus providing an opportunity to reduce their children's risk of multiple diseases and obesity. Only when we address these considerations will we have an opportunity to decrease health disparities, promote healthy behaviors, and be trusted health care partners.