Table 3. Studies on schizophrenia.

Author	Study design	Parameter	Number of patients Age in years (y)	Country	Conclusion
[4]	CS	Medical history, QPE	6,479 thereof 1,181 with AD ≥ 14 y	Netherlands	Increased risk of psychotic events (OR 1.20; p = 0.009) and hallucinations (OR 1.24; p = 0.002) in AD compared to the general population.
[23]	CS	ICD-9	835 with AD 2,434,703 controls ≥ 5 y	USA	Adults with AD: increased risk of hospitalization due to mental illness (OR 1.78), children not (OR 0.68). These hospitalized pat. were more often younger, of Asian or African-American descent, had a higher income, and several chronic diseases. Adults and children with AD showed an association with anxiety and developmental disorder. An association between AD and mood disorder, schizophrenia, addiction, personality disorder, adaptation disorder, ADHD, or behavioral disorder was only found in adults.

CS = cross sectional; pat. = patient; y = years; OR = odds ratio.