RESULTS : Among 167 methadone maintenance patients , the prevalence of QTc prolongation to 0.50 second ( ( 1/2 ) ) or longer was 16.2 % compared with 0 % in 80 control subjects .
O O O O B-ChemicalEntity O B-OrganismTaxon O O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O O O O O O O O O O O O O O O O O O O O O