Observational study of the coverage rate and survival analysis of COVID-19 vaccination among Indigenous people in...

To estimate vaccination coverage against COVID-19, analyzing survival rates and the delay in vaccination among three Indigenous groups in Roraima between 2021 and 2023.

This observacional retrospective study is based on vaccination records of urban Indigenous people and Indigenous people assisted by the Eastern Roraima and Yanomami Special Indigenous Health Districts (DSEI), available on the National Health Data Network. Survival and delayed vaccination analyses were conducted by means of the chi-square (χ²), Kaplan-Meier, Cramér's V, and log-rank tests.

Data from 53,613 vaccinated Indigenous people were analyzed. The average time to complete the vaccination schedule was lower among the Indigenous people served by Eastern Roraima DSEI, which also had a lower rate of delayed vaccination (55.1%). The comparison of the survival curves revealed significant differences between the groups (χ²=1.308; p-value<0.001), and the pairwise analyses confirmed statistical distinctions between all the groups (p-value<0.001).

The study identified low vaccination coverage and significant differences in vaccination rates and patterns between the groups analyzed. The Eastern Roraima DSEI had the best vaccination indicators, with the shortest time to complete the vaccination schedule and the lowest immunization delay.