Background: Every year, more than 1.4 million children worldwide die from diseases that can be prevented by immunization. Immunization is still one of the most cost-effective preventive measures to reduce mortality and morbidity among children. This study aimed to analyze the influence of posyandu contextual and maternal characteristics on the provision of complete basic immunization in children aged 12-23 months. Subjects and Method: This was an observational analytic study with a cross sectional design. The study was conducted at 25 integrated health posts (posyandu) in Jember, East Java, Indonesia from September to October 2019. A sample of 200 mothers who had children aged 12-23 months was selected by simple random sampling. The dependent variable was complete basic immunization. The independent variables were maternal education, maternal knowledge, parity, maternal employment status, family income, maternal attitude, family support, and contextual effect of posyandu. The data were collected by questionnaire and analyzed by a multilevel logistic regression analysis run on Stata 13. Results: Provision of complete basic immunization increased with maternal education ≥Senior high school (b= 2.99; 95% CI= 1.26 to 4.73; p= 0.001), good maternal knowledge (b= 1.93; 95% CI= 0.38 to 3.53; p= 0.018), family income ≥Rp 2,170,000 (b= 1.18; 95% CI= -0.15 to 2.50; p= 0.081), positive maternal attitude (b= 1.92; 95% CI= 0.45 to 3.39; p= 0.011), and strong family support (b= 2.29; 95% CI= 0.62 to 3.96; p= 0.007). Complete basic immunization decreased with maternal parity ≥3 (b= -1.35; 95% CI= -2.68 to -0.01; p= 0.048) and mother working outside the home (b= -2.67; 95% CI= -4.49 to - 0.85; p= 0.004). Posyandu had contextual effect on the provision of complete basic immunization in children aged 12-23 months with ICC= 23.65%. Conclusion: Provision of complete basic immunization increases with maternal education ≥Senior high school, good maternal knowledge, family income ≥Rp 2,170,000, positive maternal attitude, and strong family support. Complete basic immunization decreases with maternal parity ≥3 and mother working outside the home. Posyandu has contextual effect on the provision of complete basic immunization in children. Keywords: basic immunization, children aged 12-23 months, integrated health post, multilevel analysis Correspondence: Revina Fiandany Erynda. Masters Program in Public Health, Universitas Sebelas Maret. Jl. Ir. Sutami 36A, Surakarta 57126, Central Java. Email: revinaerynda@gmail.com . Mobile: 08536180003. Journal of Maternal and Child Health (2020), 5(2): 154-166 https://doi.org/10.26911/thejmch.2020.05.02.05
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