Table 3.

Primary and secondary outcomes

Parameters	Helmet mask*	Face mask*	p value†	Mean difference	Confidence interval
Duration of NIV	4.53 ± .77	7.60 ± 1.35	0.00	−3.06	−3.63–(–2.49)
Length of ICU stay	6.37 ± 0.55	11.57 ± 2.16	0.00	−5.200	−6.01–(–4.38)
PAO2/FIO2‡	263.57 ± 31.56	209.33 ± 20.53	0.00	54.233	40.47–67.99
Respiratory rate	22.53 ± 1.69	27.37 ± 1.15	0.00	−4.83	−5.58–(–4.08)
Heart rate	84.17 ± 1.48	83.93 ± 1.28	0.35	0.23	−0.48–0.95
Mean arterial blood pressure	82.6 ± 1.65	83.03 ± 1.09	0.46	−0.43	−1.15–0.29
Patient comfort	7.20 ± .551	4.53 ± .62	0.00	2.66	2.36–2.97

^*Values are presented as mean and standard deviation.

^†p value less than 0.05 is considered significant;

^‡PaO₂/FiO₂, ratio of partial pressure of oxygen and fraction of inspiratory oxygen