Methodology for Developing a New EFNEP Food and Physical Activity Behaviors Questionnaire.

Objective: Research methods are described for developing a food and physical activity behaviors questionnaire for the Expanded Food and Nutrition Education Program (EFNEP), a US Department of Agriculture nutrition education program serving low-income families.

Design: Mixed-methods observational study. The questionnaire will include 5 domains: (1) diet quality, (2) physical activity, (3) food safety, (4) food security, and (5) food resource management. A 5-stage process will be used to assess the questionnaire's test-retest reliability and content, face, and construct validity.

Setting: Research teams across the US will coordinate questionnaire development and testing nationally.

Participants: Convenience samples of low-income EFNEP, or EFNEP-eligible, adult participants across the US.

Interventions: A 5-stage process: (1) prioritize domain concepts to evaluate (2) question generation and content analysis panel, (3) question pretesting using cognitive interviews, (4) test-retest reliability assessment, and (5) construct validity testing.

Main Outcome Measure: A nationally tested valid and reliable food and physical activity behaviors questionnaire for low-income adults to evaluate EFNEP's effectiveness.

Analysis: Cognitive interviews will be summarized to identify themes and dominant trends. Paired t tests (P ≤ .05) and Spearman and intra-class correlation coefficients (r > .5) will be conducted to assess reliability. Construct validity will be assessed using Wilcoxon t test (P ≤ .05), Spearman correlations, and Bland-Altman plots.