| ARDS | Acute Respiratory Distress Syndrome |
| ARISCAT | Assess Respiratory Risk in Surgical Patients in Catalonia |
| BMI | Body Mass Index |
| CI | Confidence Interval |
| COPD | Chronic Obstructive Pulmonary Disease |
| FiO2 | Fraction of Inspired Oxygen |
| ICU | Intensive Care Unit |
| NYHA | New York Heart Association |
| PEEP | Positive End-Expiratory Pressure |
| PPCs | Postoperative Pulmonary Complications |
| RR | Relative Risk |
| SD | Standard Deviation |
| SpO2 | Peripheral Oxygen Saturation |
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