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"The evidence from our systematic review indicates that the overall positive health effects of increased risky outdoor play provide greater benefit than the health effects associated with avoiding outdoor risky play. Although these findings are based on ‘very low’ to ‘moderate’ quality evidence, the evidence suggests overall positive effects of risky outdoor play on a variety of health indicators and behaviours in children aged 3-12 years. Specifically, play where children can disappear/get lost and risky play supportive environments were positively associated with physical activity and social health, and negatively associated with sedentary behaviour. Play at height was not related to fracture frequency and severity. Engaging in rough and tumble play did not increase aggression, and was associated with increased social competence for boys and popular children, however results were mixed for other children. There was also an indication that risky play supportive environments promoted increased play time, social interactions, creativity and resilience. These positive results reflect the importance supporting children’s risky outdoor play opportunities as a means of promoting children’s health and active lifestyles."