Supplementary Table 2.

Variables included in PIM-2 score (2)

PIM-2 Data collection form
Pediatric intensive care unit
Hospital universitario San Ignacio
Name:	MR:	Age:
Systolic pressure (mm Hg)	Unknown = 120
	Write 0 if the patient is in cardiac arrest, and 30 if he/she is in shock or his/her blood pressure is so low that it cannot be measured.
Pupillary response to light	>3 mm and fixed = 1; unknown/other = 0
	It is used as a brain function index, do not register a finding as abnormal if it is due to drugs, toxins or local lesion
PaO2, mm Hg	Unknown = 0
	Concomitant to FiO2 (not with mask)
FiO2	Unknown = 0
	At the same time as PaO2 if oxygen is with ETT or Hood chamber. Expressed from 0 to 1 (no percentage), e.g., 0.60
Base excess in arterial or capillary blood	Unknown = 0
Mechanical respiratory assistance during the first hour of admission to the PICU	Yes = 1; No = 0. Includes nasal or mask CPAP and in BiPAP
Elective admission to the PICU for monitoring, procedure, revision of mechanical ventilation, postoperative elective surgery	Yes = 1; No = 0.
	It is considered elective when it can be postponed for more than 6 hours without causing adverse effects
Hospitalization for recovery from surgery or procedure as the main reason for admission to the PICU.	Yes = 1; No = 0
Admission after cardiac bypass	Yes = 1; No = 0
Diagnosis of a known high risk of any of the following pathologies:	1. Cardiac arrest or Cardiorespiratory arrest prior to admission to the ICU, 2. Severe combined immunodeficiency, 3. Leukemia or lymphoma after first induction, 4. Spontaneous cerebral hemorrhage, 5. Cardiomyopathy or myocarditis, 6. Hypoplastic left heart syndrome, 7. HIV infection, 8. Hepatic failure as the main reason for admission, 9. Neurovegetative disorder
Diagnosis of low risk as the main cause of admission.	Yes = 1 No = 0 In case of doubt = 0
	1. Asthma 2. Bronchiolitis 3. Croup 4. Obstructive sleep apnea 5. Diabetic ketoacidosis

The following equation was used to calculate the risk of mortality in the PIM-2 score

PIM-2 = {0.01395 × [absolute. (TAS-120)]} + (3.0791 × pupillary reaction) + [0.2888 × (100 × FiO₂/PaO₂)] + {0.104 × [abs. (Base excess)]} + (1.3352 × Mechanical ventilation in the first hour) –(0.9282 × elective admission) – (1.0244 × recovery from surgery or procedure) + (0.7507 × recovery from cardiovascular surgery with pump) + (1.6829 × high-risk diagnosis) – (1.577 × low-risk diagnosis) – 4.8841

Probability of death = exp. (r)/(1 + exp. (r) (2)