What is the difference between Type I and Type II Schizophrenia

Answered on Quora by Kaytee Faulkner, studies Psychological Science at Australian Catholic University "Type I Schizophrenia consists exclusively of positive symptoms, has a later and typically sudden onset and a better response to treatment(pharmocotherapy) It is associated with biochemical abnormalities and individuals with this type generally have higher premorbid functioning. Type II Schizophrenia, however, manifests only negative symptoms which typically have an earlier onset. It is associated with structural abnormalities in the brain and individuals with it have a poorer prognosis and lower premorbid functioning".