| SUBGROUPS | |
| Overall risk of bias | High risk of bias Low or uncertain risk of bias |
| According to ICU population | Medical Surgical |
| According to different definitions of oxygen target | Oxygen level measured using FiO2 Oxygen level measured using PaO2 Oxygen level measured using SaO2 or SpO2 Oxygen level measured using PaO2 or SaO2 or SpO2 |
| According to oxygen delivery system | Invasive mechanical ventilation with endotracheal tube Any non‐invasive ventilation |
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