Table 1. Blood gas status.

	SaO2			PaO2			PaCO2
	multiple SI	single SI	no SI	multiple SI	single SI	no SI	multiple SI	single SI	no SI
Fetal	44 ± 23	79 ± 11	50 ± 17	26 ± 15b	33 ± 11ac	19 ± 6b	55 ± 19	64 ± 21	65 ± 24
BV	10 ± 7	11 ± 9	9 ± 9	6 ± 4	8 ± 10	7 ± 4	91 ± 26	124 ± 11	96 ± 34
1	17 ± 9	49 ± 37	23 ± 13	10 ± 5	22 ± 11	12 ± 5	97 ± 23	109 ± 35	97 ± 32
2.5	21 ± 14b	75 ± 35a	37 ± 33	13 ± 6	40 ± 30	19 ± 14	93 ± 19	77 ± 35	86 ± 44
5	37 ± 33b	83 ± 37a	50 ± 42	22 ± 22b	74 ± 48ac	36 ± 34b	83 ± 17	60 ± 39	83 ± 28
7.5	45 ± 40	81 ± 40	57 ± 42	33 ± 38b	82 ± 51a	66 ± 59	86 ± 26	59 ± 46	73 ± 34
10	50 ± 41	84 ± 36	67 ± 39	42 ± 50b	82 ± 50a	66 ± 52	74 ± 35	48 ± 42	67 ± 32
15	64 ± 36	94 ± 10	69 ± 40	49 ± 36	66 ± 31	69 ± 51	61 ± 25	45 ± 12	48 ± 32
20	68 ± 31	93 ± 11	71 ± 36	43 ± 28	71 ± 31	50 ± 29	57 ± 19	42 ± 12	51 ± 13
30	70 ± 29	86 ± 28	68 ± 38	36 ± 19	66 ± 14	39 ± 22	57 ± 16	41 ± 15	49 ± 18

BV, before onset of ventilation; SaO2, arterial oxygen saturation; PaO2, partial pressure of oxygen; PaCO2, partial pressure of carbon dioxide. Data are mean ± SD.

^‘a’ p<0.05 vs multiple SI;

^‘b’ p<0.05 vs single SI;

^‘c’ p<0.05 vs no SI. Data adapted from previous publication [12].