Studies of Rates of Schizophrenia Across Nations Find That

Studies of rates of schizophrenia across nations find that

A) incidence rates of schizophrenia do not vary much from country to country.
B) patients with schizophrenia in less developed countries tend to fare better over time than those from more developed countries.
C) people who present psychotic symptoms that were inconsistent with a diagnosis of schizophrenia were not included in the studies.
D) subtypes of schizophrenia vary substantially from country to country.
E) All of these statements are true.