Table 3. Clinical parameters at 24 hours in patients improved with noninvasive positive pressure ventilation and patients shifted to invasive ventilation (n = 104).

*standard deviation

SpO₂: peripheral capillary oxygen saturation

Clinical parameters	Noninvasive ventilation group  (n = 73)	Invasive ventilation group (n = 31)	Probability value
Systolic blood pressure, mmHg	121.1 (±8.3)*	133.8 (±21.2)*	<0.000
Diastolic blood pressure, mmHg	76.2 (±10.8)*	68.7 (±13.4)*	0.003
Arterial pH	7.42 (±0.01)*	7.20 (±0.13)*	<0.000
Heart rate per minute	100.2 (±7.5)*	131.1 (±10.5)*	<0.000
SpO2, %	93.4 (±4.5)*	90.7 (±3.0)*	0.004