The patients in icy normal saline group had a rectal temperature descended from ( 36.7 0.9 ) centigrade to ( 34.9 0.7 ) centigrade 1 hour later , while the patients in control group had a rectal temperature risen from ( 36.5 1.0 ) centigrade to ( 37.9 0.9 ) centigrade 1 hour later .