Introduction: According to the World Health Organization (WHO), pneumonia remains a leading cause of mortality among children under five years of age. Nutritional status and immunization are among the factors contributing to the occurrence of pneumonia in young children. Objective: This study aimed to determine the association between nutritional status and basic immunization status and the incidence of pneumonia among children aged 1–5 years. Method: This study employed a quantitative analytic observational design with a cross-sectional approach. Secondary data were obtained from medical records. A total of 92 respondents were selected using purposive sampling. Data were analyzed using the Kolmogorov–Smirnov test and the chi-square test. Results: The results showed that 53 children (57.6%) had low body weight, 31 children (33.7%) had normal body weight, and 8 children (8.7%) were at risk of overweight. Regarding immunization status, 74 children (80.4%) had complete basic immunization, while 18 children (19.6%) had incomplete immunization. Statistical analysis revealed a significant association between nutritional status and pneumonia (p = 0.000), as well as between basic immunization status and pneumonia (p = 0.035). Conclusion: Nutritional status and basic immunization status were significantly associated with the incidence of pneumonia among children aged 1–5 years
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