The mathematical method “oriented trees with estimates” is used to study the structure of 411,581 requests from 71,483 children to a medical organization for primary diseases. The data of the medical information system of the hospital for 2015–2018 were used. The regularities of the sequence of pathology formation in 35,288 children under 7 years old and 36,195 children from 7 to 17 years old and the average age of detection of diseases are established. So, the onset of the disease J06.9 (depending on age) is expected to be 1.9–4.6 times more likely if there was one of the diseases G93.8 or G94 before than after one of the diseases J20.9 or J20.8 according to ICD-10. The data obtained can be used for individual preventive work with children.
Management in health care