Comparison 1. Noninvasive positive pressure ventilation (NPPV) versus oxygen therapy.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Rate of tracheal intubation	2	269	Risk Ratio (IV, Random, 95% CI)	0.25 [0.08, 0.83]
2 Intensive care unit (ICU) length of stay (days)	2	269	Mean Difference (IV, Random, 95% CI)	‐1.84 [‐3.53, ‐0.15]