What is downward drift

There is no difference in the prevalence of schizophrenia between men and women however, the age of onset is affected. Men tend to develop it between 15 and 25 years of age and women between 25 and 35 years of age. Having a first degree relative with schizophrenia increases a patients' risk of schizophrenia tenfold. Being born in the cold winter months or in an area of high population density have also been associated with increased risk (though less so). This is the tendency of schizophrenics...