PLOS ONE · 7 authors, 2 centres
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This paper describes the implementation of a time-location sampling design to create a representative cohort for the WIC Infant and Toddler Feeding Practices Study-2. The study successfully enrolled 4,367 women/infants using a stratified, multistage approach, though it faced challenges with site cooperation and recruitment flow.
This paper details the implementation of a stratified, multistage time-location sampling (TLS) design for the WIC Infant and Toddler Feeding Practices Study-2, a longitudinal cohort study. The goal was to enroll a representative probability sample of infants newly enrolled in the WIC program, either prenatally or postnatally. The method involved selecting WIC sites and then sampling eligible participants during predetermined recruitment windows. The authors report successfully enrolling 4,367 women/infants from 80 cooperating sites, with a study enrollment response rate of 82 percent. Key implementation challenges included overcoming incomplete site lists, discrepancies between projected and actual enrollment flows, site non-cooperation, and varying site schedules. These challenges necessitated adjustments during recruitment. The study is designed to follow participants to assess associations between WIC participation and child diet and health outcomes. The findings are specific to the 2013 recruitment period and are subject to exclusions based on geography and site size.
