TABLE 3. Postoperative pulmonary complications predictive models.

Trial	Miskovic et al. [1]	Smetana et al. [2]	Yepes-Temiño et al. [13]	ARISCAT [10]	PERISCOPE [11]	VA-NSQIP [15]
Surgical risk factors	Thoracic surgery (lung resection)	Thoracic surgery	Thoracotomy	Surgical incision (upper abdominal or thoracic	Intrathoracic or upper abdominal surgery
	Upper and lower abdominal surgery	Abdominal surgery
		Prolonged surgery		Duration of surgery >2 h	Procedure >2 h
		Emergency surgery		Emergency surgery	Emergency surgery	Emergency surgery
		Neurosurgery				Complex operations (work relative value units)
		Head/neck surgery
		Vascular surgery
		AAA repair
Comorbidities		CHF			CHF	CHF
		COPD	COPD			COPD
			Diabetes	Preoperative anemia	Chronic liver disease
			Primary lung cancer
Pre-operative conditions					Low preoperative SpO2	Preoperative sepsis
			Preoperative respiratory symptoms		At least 1 preoperative respiratory symptom	Elevated creatinine
			URI within the past month	URI within the past month
Functional status		ASA class >2	ASA Class >2			ASA Class >2
		Functional dependence
Patient factors		Advanced age		Advanced age		Advanced age
			Current smoker			Current smoker
						Male sex

Note: AAA- Abdominal Aortic Aneurysm, ASA Class- American Society of Anesthesiologists Physical Status Classfication, CHF- Congestive Heart Failure, COPD- Chronic Obstructive Pulmonary Disease, SpO₂- Blood Oxygen Saturation levels, URI- Upper Respiratory Infection.