Trends and predictors of full immunization coverage in Nigeria

Immunization plays a significant role in global health, yet many children in Nigeria do not receive full immunization due to several influencing factors. Therefore, this study examined the trends in Nigeria’s full immunization coverage and identified key predictors that influence full coverage. The data for children aged one to five years, across the six geopolitical zones of Nigeria was retrieved from the 2007, 2011, 2016/17, and 2021 national Multiple Indicator Cluster surveys We analyzed the data using univariate logistic regression. Results were presented as adjusted odds ratios (aORs), and statistical significance was set at 0.05. The results showed that 12,229 children (74.2%) had been fully immunized. The trend of immunization coverage was 63.6%, 82%, 63.7%, and 76.4% in 2007, 2011, 2016/17, and 2021 respectively. Children of educated mothers (aOR: 2.6; 95% CI 1.45, 4.76) and from the richest families (aOR: 2.1; 95% CI 1.41, 3.11), were more likely to be fully immunized. Conversely, children in rural areas (aOR: 0.6; 95% CI 0.42, 0.81) and from families of more than five (aOR: 0.6; 95% CI 0.46, 0.81) were less likely to be fully immunized. As of 2021, the rate of full immunization coverage in Nigeria was 76.4%, an improvement from the low 2003 rate (12.3%). Maternal education and wealth index are significant sociodemographic determinants for full immunization coverage. Adopting policies that improve access to education for females nationally and access to healthcare, especially in rural areas may significantly increase full immunization coverage.