Generalised anxiety disorder (GAD) - diagnostic criteria

1)Excessive anxiety and worrying occurring more days than not over a 6 month period (or longer). 2)Difficulty controlling the worrying. 3) Three or more of the following: restlessness, difficulty concentrating, easily fatigued, irritability, muscle tension, sleep disturbances (Only one in the case of a child). 4) The worrying impairs functioning. 5) Not caused by substance abuse. 6) Symptoms not better explained by another mental disorder