Risk factors and optimal predictive scoring system of mortality for children with acute paraquat poisoning

Table 1 Pediatric critical illness score

Parameter	Age < 1 yr	Age ≥ 1 yr	Scores
Heart rate (beats/min)	< 80 or > 180	< 60 or > 160	4
	80-100 or 160-180	60-80 or 140-160	6
	Others	Others	10
Blood pressure (systolic) [kPa (mmHg)]	< 7.5 (55) or > 17.3 (130)	< 8.7 (65) or > 20 (150)	4
	7.5-8.7 (55-65) or 13.3-17.3 (100-130)	8.7-10 (65-75) or 17.3-20 (130-150)	6
	Others	Others	10
Breathing rate (breaths/min)	< 20 or > 70 or irregular breathing	< 15 or > 60 or irregular breathing	4
	20-25 or 40-70	15-20 or 35-60	6
	Others	Others	10
PaO2 [kPa (mmHg)] (no oxygen inhalation)	< 6.7 (50)		4
	6.7-9.3 (50-70)		6
	Others		10
pH	< 7.25 or > 7.55		4
	7.25-7.30 or 7.50-7.55		6
	Others		10
Na+ (mmol/L)	< 120 or > 160		4
	120-130 or 150-160		6
	Others		10
K + (mmol/L)	< 3.0 or > 6.5		4
	3.0-3.5 or 5.5-6.5		6
	Others		10
Scr (μmol/L)	> 159		4
	106-159		6
	Others		10
BUN (mmol/L)	> 14.3		4
	7.1-14.3		6
	Others		10
Hb (g/L)	< 60		4
	60-90		6
	Others		10
Digestive system symptoms	Stress ulcer bleeding and intestinal paralysis		4
	Stress ulcer bleeding		6
	Others		10

pH: Pondus hydrogenii; Na⁺: Serum sodium; K⁺: Serum potassium; Scr: Serum creatinine; BUN: Blood urea nitrogen; Hb: Hemoglobin.