Aim: Aggressive incidents (AI) are a serious concern in health care and can have negative effects on the physical and emotional well-being staff. This study aimed to determine frequency, characteristics and risk factors for aggressive behavior.Methods: AI were recorded during six months by the staff in a pediatric rehabilitation clinic using the evaluation form for AI (EVA). Patients were divided into the study group (patients who were involved in AI) and controls.Results: 14/105 (13%) of patients were involved in 79 AI. 0.44 AI per day occurred. Most often AI occurred on Mondays and 98% included physical, 22% verbal aggression. Most frequent target (43%) were nurses, followed by therapists (31.6%).Significant risk factors for AI were: previous aggressive behavior (p = .038), lower cognitive and higher mobility sub-scores in the WeeFIM. Conclusion: Findings emphasize the magnitude of AI in pediatric rehabilitation and thus the importance of implement preventive strategies.Abbreviations: ADL: Activity of daily living; AI: Aggressive Incidents; CFCS: Communication Function Classification System; EVA: Recording aggressive incidents (Erfassung von Aggressionsereignissen); GMFCS: Gross Motor Function Classification System; MACS: Manual Ability Classification System; SOAS-R: Staff Observation of Aggression Scale-Revised; WeeFIM: Functional Independence Measure for Children; WPV: Workplace violence.