Objective. The objective of this study was to measure inappropriateness of admission and inpatient days in pediatric hospital wards in Catanzaro, Italy, and the effect of different variables on such inappropriateness. Design. A retrospective application was made using the Pediatric Appropriateness Evaluation Protocol list of criteria. For each patient, there were recorded data on: sociodemographic characteristics; distance from home to hospital; date, day of the week, ward, and type of admission; overall and pre-index day length of hospital stay; and location within the stay of the day reviewed. Results. A total of 656 children were reviewed. Overall, 30% of the hospital admissions and 55.5% of days of stay were judged to be inappropriate; for about one third of those admitted inappropriately, the hospital stay was judged to be appropriate. Multiple logistic regression analysis indicated that the inappropriate admission was significantly higher if the admission occurred during the daytime. The inappropriate number of days of hospitalization was significantly higher if the patient was female, if the admission was urgent, in medical wards, for patients who were inappropriately admitted, and for those sampled close to discharge. The main reasons for inappropriate use were hospital organization and an over-cautious physician in the management of a patient. Conclusions. The high degree of inappropriate admission or days of stay in pediatric wards and the reasons for such unnecessary hospital use suggest the need for a more vigilant interaction between hospital and community-based services to mitigate such inappropriateness and for a continuing education system to define standardized guidelines.