Predictors of childhood vaccination and recent influenza vaccination in older Brazilian adults: an analysis using conventional regression and machine learning approaches.

For childhood vaccination, both analytical approaches identified age, sex, rural residence, parental education, school attendance at age 10, childhood access to books, and allergy as important predictors.

Key predictors for recent influenza vaccination included age, marriage, educational level, employment, and hypertension/diabetes.

Machine learning additionally highlighted the importance of vaccination history during childhood, life satisfaction, BMI, and mental health.