Sample
F20-F29
DISEASES, SYNDROME, POSITIVE
Four study sites, all located in major cities in Norway and Austria, recruited the participants. Inclusion took place from 20 October 2011 to 30 December 2016. Data collection was completed on 21 December 2017. Inclusion criteria were as follows: at least 18 years of age; ability to cooperate with oral treatment with antipsychotic medication; International Statistical Classification of Diseases and Related Health Problems (ICD-10) (WHO, 1994) diagnosis within the F20-F29 chapter; and a score of four or more on at least one of the following items of the Positive and Negative Syndrome Scale [