In the majority of the studies, the
results were compared with data from the general population,
instead of data from a matched control group. Four studies focused
on first-episode psychosis patients (Hepgul et al., 2011; Ryan et al.,
2003, 2004; Samele et al., 2007); only few (n ¼ 10) papers reported
a detailed medication history. Results from papers focused on firstepisode
patients were usually concordant with those from studies
involving chronic patients. A summary of the details and findings of
the studies is shown in Table 2.