Fig. 6. Recommended ODs according to weight and corresponding ID. The figure illustrates the recommended OD based on the results of the pressure study and on an OD inferior or equal to the ID determined according to interarytenoid distance. These IDs were calculated based on OD of each kind of tube specified by the fabricants. ID is expressed in millimeters. HIR = high injury risk due to a pressure excess on the cricoid or on the vocal processes of the arytenoids.