Table 2.

The Identification of Risk in Surgical Patients (IRIS) Score elements

Variable	Points
Age (years)
0-32	0
33-52	1
53-69	2
> 69	3
Acute admission
No	0
Yes	1
Acute surgery*
No	0
Yes	1
Severity of surgery**
0-3	0
4-7	1

IRIS: Identification of Risk in Surgical patients

* Surgery taking place within 24 h after admission

** Severity of surgery as defined by the Dutch Surgical Society classification of surgical procedures [22]