British Journal of Anaesthesia

The following confounder variables were categorized according to clinically reasonable cut-off points: body mass index (BMI)1, American Society of Anesthesiologists (ASA) physical status classification (0-2, 3-5), Score for Prediction of Postoperative Respiratory Complication (SPORC),2 Score for Prediction of Obstructive Sleep Apnoea (SPOSA),3 ... ................
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