Retaining Traditionally Hard to Reach Participants: Lessons Learned from Three Childhood Obesity Studies
Diet quality was assessed among participants in the WIC program across three time points following the WIC food package shift instituted nationally in 2009. Retention rates were 91% at 12 months and 89% at 18 months. For our WIC study, we augmented retention by developing a home data collection protocol and increased focus on staff diversity training.