Risk factors 、 General factors: 1. Ages Crash: younger children Near-drowning: <5 year-old or >15 year-old Traffic accident: 5-15 year-old 2. Gender 3. Race 4. Mental profileRisk factors 一 、General factors ： 1. Ages： Crash ：younger children Near-drowning ：<5 year-old or >15 year-old Traffic accident ：5－15 year-old 2. Gender: 3. Race 4. Mental profile