Table 4: Mechanical ventilation settings and in-hospital mortality.

Variables Total P-value NIPPV prior to IMV Only IMV P-value
All Patients N=54
Deaths 34
[63.0%]		 N=27
Deaths 17
[63.0%]		 N=27
Deaths 17
[63.0%]		 1.00
Deaths/n Deaths/n Deaths/n
Set Respiratory Rate
<25
25+
9/14 [64.3%]
13/15 [86.7%]		 0.21
6/8 [75.0%]
6/7 [85.7%]
3/6 [50.0%]
7/8[87.5%]
0.58
1.00
Set Tidal Volume
<400
400+
10/14 [71.4%]
9/12 [75.0%]		 1.00
4/6 [66.7%]
5/6 [83.3%]
6/8 [75.0%]
4/6 [66.7%]
1.00
1.00
Set PEEP
<10
10+
15/29 [51.7%]
12/12 [100.0%]		 0.003
9/16 [56.3%]
4/4 [100.0%]
6/13 [46.2%]
8/8 [100.0%]
0.72
1.00
Set FiO2
<50
50+
11/22 [50.0%]
16/19 [84.2%]		 0.046
6/11 [54.5%]
7/9 [77.8%]
5/11 [45.5%]
9/10 [90.0%]
1.00
0.58
Peak Airway Pressure
<30
30+
8/16 [50.0%]
15/16 [93.8%]		 0.18
3/7 [42.9%]
8/11 [72.7%]
5/9 [55.6%]
6/8 [75.0%]
1.00
1.00
Average Airway Pressure
<15
15+
9/21 [42.9%]
15/16 [93.8%]		 0.002
5/12 [41.7%]
7/7 [100.0%]
4/9 [44.4%]
8/9 [88.9%]
1.00
1.00
PaO2/FiO2
<150
150+
13/16 [81.3%]
14/26 [53.8%]		 0.10
7/8 [87.5%]
6/13 [46.2%]
6/8 [75.0%]
8/13 [61.5%]
1.00
0.70

Legend: Column 3 represents p-value for the mortality of the total number of patients as a comparison of death rate prior to cohort stratification. Column 6 represents p-values for mortality of patients compared within each strata of both NIPPV prior to IMV and Only IMV.