highly significantp -value <0.001
Heart rate, Acidosis, Consciousness, Oxygenation, and Respiratory rate score at the end of 1 hour of initiation of NIV treatment >5 had a highly significant association with NIV failure. 11 , 15 In the study group, all patients having HACOR score >5 at the end of 1 hour of initiation of NIV failed NIV treatment ( p -value <0.001), and it was noticed only one patient who had a HACOR score of <5 at the end of 1 hour of initiation of NIV failed NIV treatment ( p -value <0.001).