Testosterone , compared to placebo , worsened the oxygen desaturation index ( ODI ) by 103 events/h ( 95 % CI , 08-198 events/h ; P = 003 ) and nocturnal hypoxaemia ( sleep time with oxygen saturation < 90 % , SpO ( 2 ) T90 % ) by 61 % ( 95 % CI , 15-106 ; P = 001 ) at 7 weeks .
