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Vaccine effectiveness (VE) using multivariate conditional logistic regression to estimate laboratory-confirmed influenza-related visits by risk status for fully vaccinated children compared to unvaccinated children, adjusting for age in months and insurance type according to influenza season. High-risk conditions included asthma, cancer, diabetes, heart disease, immune deficiency, kidney disease, sickle cell disease, cystic fibrosis, and chronic lung disease.
