Abstract
Researchers are concerned about factors that influence participants’ decisions to participate and continue in longitudinal research studies, but few empirical studies have examined the role of participant motivation and study experiences. We analyzed data from 4,216 participants enrolled in the National Children’s Study Vanguard Study, a series of pilot studies for a large-scale epidemiological cohort study of children and their mothers. Findings indicated most participants joined the NCS for altruistic reasons. While our data suggest some association between reasons for joining a study and retention, they are not the strongest predictors for retention after controlling for participant demographics. Continued participation in the study was associated with demographic factors and having a positive experience in the NCS.
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