title: Epidemiology of schizophrenia
context: Schizophrenia affects around 0.3–0.7% of people at some point in their life,[1] or 21million people worldwide as of 2011 (about one of every 285).[2] By using precise methods in its diagnosis and a large, representative population, schizophrenia seems to occur with relative consistency over time during the last half-century.[3]
question: How many people have schizophrenia?
answers: 21million