We conducted a double-blind placebo-controlled clinical
trial. The duration of study was 20 weeks and it was done
on 37 patients who were hospitalized in either Ibn-e-Sina or
Hejazi Psychiatric Hospital (Mashhad, Iran) with a definitive
diagnosis of schizophrenia between December 2008 and
June 2010. Our Institutional Ethics Committee approved
the research project, and informed consent was obtained
from patients or their surrogates (research project number:
2214). Potential candidates for the study were interviewed
by two psychiatrists and if the diagnosis of schizophrenia
was confirmed using diagnostic and statistical manual of
mental disorders, 4th edition, text revision (DSM-IV-TR)
criteria for schizophrenia and they met our inclusion
criteria, the patients would receive clozapine combined by
either placebo or metformin by a nurse who was unaware
of the study groups.[28]
The sample size was calculated with considering a
confidence interval level of 95%, α = 0.05 and a sample power
of 95%. 60 patients were initially included in this study and
they were randomly assigned into a group of metformin
We conducted a double-blind placebo-controlled clinicaltrial. The duration of study was 20 weeks and it was doneon 37 patients who were hospitalized in either Ibn-e-Sina orHejazi Psychiatric Hospital (Mashhad, Iran) with a definitivediagnosis of schizophrenia between December 2008 andJune 2010. Our Institutional Ethics Committee approvedthe research project, and informed consent was obtainedfrom patients or their surrogates (research project number:2214). Potential candidates for the study were interviewedby two psychiatrists and if the diagnosis of schizophreniawas confirmed using diagnostic and statistical manual ofmental disorders, 4th edition, text revision (DSM-IV-TR)criteria for schizophrenia and they met our inclusioncriteria, the patients would receive clozapine combined byeither placebo or metformin by a nurse who was unawareof the study groups.[28]The sample size was calculated with considering aconfidence interval level of 95%, α = 0.05 and a sample powerof 95%. 60 patients were initially included in this study andthey were randomly assigned into a group of metformin
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