Factors Affecting the Validity of Coverage Survey Reports of Receipt of Vitamin A Supplements During Child Health Days in Southwestern Burkina Faso.

Background:Assessment of high-dose vitamin A supplementation (VAS) coverage often relies on postevent coverage (PEC) surveys, but the validity of these methods has rarely been evaluated.Objectives:To assess reported VAS coverage and factors associated with missed coverage and to investigate the reliability of the results.Methods:During a cross-sectional survey, 10 454 caregivers of children <27 months old were asked whether their child had received VAS in the past 6 months. During a 48-week longitudinal study of 6232 children 6 to 30 months old, caregivers were asked every 4 weeks if their child had received VAS in the past 4 weeks.Results:The cross-sectional study showed that 94.4% (95% confidence interval [CI]: 93.8%, 94.9%) of eligible children 6 to 26 months of age reportedly received VAS in the previous 6 months, as did 85.8% (CI: 84.5%, 87.2%) of ineligible, 0 to 5 months old children. The longitudinal study showed that 81.6% of children surveyed within 4 weeks following a VAS campaign reportedly re...