Table 1.

Parameters of the ARISCAT Score and Risk Classification

Score Components		Risk Score
Age	≤50 year	0
	51–80 year	3
	>80 year	16
Preoperative oxygen saturation	≥96%	0
	91–95%	8
	≤ 90%	24
Respiratory infection in past 1 month	No	0
	Yes	17
Preoperative hemoglobin < 10g/dl	No	0
	Yes	11
Incision	Peripheral incision	0
	Upper abdominal incision	15
	Intrathoracic incision	24
Surgery duration	<2 hours	0
	2–3 hours	16
	>3 hours	23
Emergency procedure	No	0
	Yes	8
Risk	ARISCAT Score
Low	< 26 (1.6%)
Medium/Intermediate	26–44 (13.3%)
High	≥ 45 (42.1%)