Internações por Condições Sensíveis à Atenção Primária de Menores de um ano, de 2008 a 2014, no estado de São Paulo, Brasil.

The scope of this article is to describe the trends of primary health care-sensitive (PHC) hospitalizations in children under one year of age between 2008 and 2014 in the State of Sao Paulo, Brazil. It is an ecological study with descriptive and analytical characteristics, based on secondary data from the national health information system. Hospitalizations were classified according to the Brazilian list of PHC hospitalizations considering the Early Neonatal, Late Neonatal and Post-Neonatal age groups. Linear regression models were adjusted for trend analysis of the 851,713 hospitalizations of children under one year of age analyzed, of which 22.6% were PHC-related. The main groups with decreases were: Bacterial pneumonia (-7.10%) and Nutritional disorders (-7.70%) in the Early neonatal phase. The main increases were: Disease related to prenatal/childbirth (+10.14%) and Immunosuppressive diseases and avoidable conditions in Post-neonatal (+14.13%) infants, among which pertussis and congenital syphilis were the main causes of hospitalization. The results showed a deficiency in the primary health care system for infants in the State of Sao Paulo. The estimated trends should be used for planning cost-effective strategies to prevent and control causes of hospitalization in children under one year of age.