Immunization Patterns of Children with Chronic Neurological and Neurodevelopmental Disorders: A Cross-Sectional Study from Istanbul.

Immunization status differed significantly across diagnostic groups ( p < 0.001).

Partial vaccination was more common than complete vaccine refusal across most diagnostic categories.

Lower full vaccination rates were observed in autism spectrum disorder and cerebral palsy, whereas higher coverage was observed in Down syndrome.

Among partially vaccinated children, interruption of routine immunization after 48 months was the most frequent pattern.