Which of the following statements are true regarding schizophrenia? #1. It strikes men and women with equal frequency. #2. It usually appears in men their late teens or early twenties. #3. It usually appears in women in their twenties or early thirties. #4. It can be difficult to determine if schizophrenia was a pre-existing condition or if it was substance induced by the abuse of drugs.

Schizophrenia is an endogenous psychiatric disease characterized by loss of contact with reality. One can be closed in on oneself, with one's gaze lost, indifferent to everything that goes on around or, the most classic examples, hallucinations and delusions. She/he hears voices no one else hears and imagines being the victim of a diabolical plan plotted with the firm purpose of destroying her/him. There is no argument or common sense to convince you otherwise.

Schizophrenia settles in young people. The incidence, however, is equal in both sexes. The ratio is one man to every woman with the disease.

According to some statistics, schizophrenia affects between 0.6% and 3% of the world's population, depending on the criteria, usually manifesting between 15 and 30 years, in similar proportions between men and women, usually appearing earlier in men and hardly starts after age 50 .