This dataset contains data about 73 patients with a diagnosis of brain tumor in developmental age. This cohort includs subjects between 6-18 years at assessment, accessing to a pediatric rehabilitation center in Italy, the Scientific Institute I.R.C.C.S. . E. Medea, Bosisio Parini, Italy. The original dataset was composed of 78 subjects, but 5 patients were excluded because they were identified as outliers. The data were used to explore the possible clinical and cognitive predictors of the adaptive functioning in this clinical population. The related papaer is currently under submission. The clinical collected measures are: age_at_diagnosis: age of the patient at diagnosis, expressed in month; tumor_site: the location of the tumor, classified as supratentorial or infratentorial; tumor_type: the histopathological tumor type, classified as astrocytoma, ependymoma, medulloblastoma or other (meaning more rare tumors, such as theratoid rabdoid tumor, brainstem gliomas…) chemiotherapy: scored yes or not, whether the child underwent chemotherapy treatment or not; radiotherapy: scored yes or not, whether the child underwent radiotherapy treatment or not; surgery: scored yes or not, whether the child underwent neurosurgery treatment or not; hydrocephalus: scored present or absent, whether the child developed hydrocephalus or not; time_since_diagnosis: the time (expressed in months) passed through the diagnosis to the functional evaluation. age_at_assessment: age of the patient at assessment, expressed in month. The cognitive collected measures from the Wechsler Intelligence Scale for Children, 4th Edition are: VCI: Verbal Comprehension Index; VSI: Visual Spatial Index; FSIQ: Full Scale Intelligent Quotient; WMI: Working Memory Index; PSI: Processing Speed Index. The adaptive functioning measures collected from the Functional Independence Measure for children (WeeFIM, version 5.0) are: WeeFIM_selfcare: score ranges from 8 to 56; WeeFIM_mobility: score ranges from 5 to 35; WeeFIM_cognition: score ranges from 5 to 35. Higher scores expressed better independence and less need of assistance. Moreover the score of each of the 18 items composing the scale and divided in the 3 domains were collected. All item scores ranged between 1 to 7, with higher scores expressing better independence and less need of assistance. selfcare_eating, _grooming, _bathing, _dressing (upper), _dressing (lower), _toileting, _bladder, _bowel mobility_bed, chair, wheelchair transfer, _toilet transfer, _tub/shower transfer, _walk/wheelchair, _stairs cognition_comprehension, _expression, _social interaction, _problem solving, _memory