Table 1. Cohort Characteristics by Oxygenation Status.

	Hyperoxia n = 87 (%)	Normoxia n = 66 (%)	Hypoxia n = 22 (%)	Hyperoxia and Hypoxia n = 20 (%)	p
Demographics
Age
<2 yr	43 (49)	26 (39)	10 (45)	7 (35)	0.78
2–11 yr	28 (32)	24 (36)	9 (41)	8 (40)
12–18 yr	16 (18)	16 (24)	3 (14)	5 (25)
Gender
Male	59 (68)	42 (64)	13 (59)	11 (55)	0.69
Female	28 (32)	24 (36)	9 (41)	9 (45)
Preexisting condition
Ye s	56 (64)	50 (76)	18 (82)	14 (50)	0.28
No	31 (36)	16 (24)	4 (18)	6 (30)
Cardiac arrest details
Location
In-hospital in an ICU	31 (36)	34 (52)	11 (50)	10 (50)	0.34
In-hospital not in an ICU	26 (30)	15 (23)	3 (14)	5 (25)
Out of hospital	30 (34)	15 (23)	8 (36)	5 (25)
Etiology
Cardiac	42 (48)	35 (53)	13 (59)	13 (65)	0.51
Respiratory	39 (45)	36 (55)	9 (41)	6 (30)	0.17
Rhythm
Asystole	43 (49)	22 (33)	6 (27)	14 (70)	0.08
Ventricular tachycardia/ventricular fibrillation	7 (8)	5 (8)	3 (14)	1 (5)
Other	27 (31)	27 (41)	9 (41)	3 (15)
Epinephrine doses
0	7 (8)	7 (11)	4 (18)	0 (0)	0.53
1	19 (22)	17 (26)	6 (27)	3 (15)
2	14 (16)	12 (18)	4 (18)	4 (20)
3	21 (24)	11 (17)	2 (9)	3 (15)
4+	23 (26)	18 (27)	4 (18)	9 (45)
Postarrest features
Paco2
Hyperventilation	29 (69)	10 (15)	6 (27)	3 (15)	0.001
Normoventilation	26 (30)	25 (38)	2 (9)	4 (20)
Hypoventilation	19 (22)	29 (44)	8 (36)	8 (40)
Hyperventilation and hypoventilation	13 (15)	2 (3)	6 (27)	5 (25)
Extracorporeal membrane oxygenation support	11 (13)	4 (6)	4 (18)	9 (45)	<0.001
Spontaneous hypothermia	46 (53)	19 (29)	13 (59)	6 (30)	0.009
Hyperglycemia	46 (53)	31 (47)	10 (45)	9 (45)	0.99
Postarrest care
PICU days, median (IQR)	5 (1,16)	6 (2,12.5)	11 (4,28)	6 (3,25.5)	0.33
Hospital days	9 (1,29)	7 (3,17)	16 (4,28)	7 (3,37)	0.53

Column percentages are shown. Numbers may not sum to 100 due to rounding.