. 2016 May 31;11:1151–1160. doi: 10.2147/COPD.S104801

Table 5.

Binary logistic regression of the risk predictors for NIMV failure (sent to ICU or death) in COPD patients with ARF

Predictors	Odds ratio	95% confidence interval	P-value
Predictors	Odds ratio	Lower–Upper	P-value
pH<7.31 on control ABG after NIMV in ER	2.84	1.09–7.39	0.032
Delta pH<0.30 between baseline and control	1.60	0.59–4.35	0.36
Peak C-reactive protein	1.02	1.01–1.00	0.016
PaO₂/FiO₂ ratio <200 on control ABG after NIMV	0.66	0.29–1.53	0.34
PaO₂/FiO₂ ratio <200 on baseline ABG at the ER	3.09	1.28–7.44	0.012

Abbreviations: ABG, arterial blood gas; NIMV, noninvasive mechanical ventilation; ER, emergency room; ARF, acute respiratory failure; PaO₂/FiO₂, partial arterial blood oxygen pressure over inspired oxygen fractionation; ICU, intensive care unit.