Abstract
OBJECTIVE: To estimate vaccination coverage (VC) and analyze the factors associated with the incomplete vaccination schedule (IVS) in children under 5 years of age in two Basic Health Units in the Federal District of Brazil. DESIGN: A cross-sectional study. SAMPLE: The study included 162 children in two Basic Health Units; 54.94% were male, and all were under 5 years of age. MEASUREMENTS: Guardians were interviewed using a structured questionnaire, and their vaccination booklets were photographed. VC was estimated and prevalence ratios (PR) were calculated using Poisson regression analysis. RESULTS: Twenty percent of the children had an IVS. None of the vaccines evaluated reached the VC considered correct in terms of age and interval between doses. Factors associated with IVS were age under 2 years (adjusted PR: 2.55; 95% CI: 1.53-4.24), difficulties arising from the COVID-19 pandemic (adjusted PR: 2.71; 95% CI: 1.51-4.86) and a negative response when asked whether all vaccines were administered in the same location (adjusted PR: 1.97; 95% CI: 1.13-3.44). CONCLUSIONS: A high proportion of children presented IVS, associated with factors such as age, lack of continuity of vaccination in the same location and difficulties caused by the COVID-19 pandemic.