The study looked at 12.2 million people born in Ontario between 1960 and 2009. Over the study period, rates of new diagnoses of psychotic disorder, including schizophrenia, increased by 60 per cent in people aged 14 to 20 years old between 1997 and 2023. The increases occurred in more recent birth cohorts. People born between 2000 and 2004, for example, were estimated to have a 70-per-cent greater rate of diagnoses of psychotic disorders than those born between 1975 and 1979.
