STOP-Bang has been proposed to detect OSA patients. It has been validated. New algorithm of STOP-Bang was proposed by the end of 2016. This aim of this study was to evaluate the ability of this new algorithm to detect severe OSA patients (patients with more than 30 events per hour). The new algorithm was also compared in this same ability with three others clinical score (P-SAP, OSA50 and DES-OSA).