Incidence and Risk Factors of Postoperative Pulmonary Complications in Noncardiac Chinese Patients: A Multicenter Observational Study in University Hospitals

Table 6

Distribution of PPCs risk index scores in patients.

	Risk class
	Low risk; (<13 points)	Intermediate risk; (13–30 points)	High risk; (31–42 points)	Extremely high risk; (>42 points)
Cohort 1, n (%)	672 (74.5)	127 (14.1)	67 (7.4)	36 (4.0)
Cohort 2, n (%)	577 (74.8)	110 (14.3)	54 (7.0)	30 (3.9)
Rate of PPCs in cohort 1, n (%)	21 (3.1)	22 (17.3)	38 (56.7)	31 (86.1)
Rate of PPCs in cohort 2, n (%)	5 (0.9)	17 (15.5)	12 (22.2)	17 (56.7)

PPCs: postoperative pulmonary complications.