Table 4.

Blood gas comparison between two groups at three-time points.

		MISA (n = 151)	EISA (n = 147)	t	p
Pre-surfactant
	PH	7.30 ± 0.18	7.29 ± 0.09	0.401	0.682
	PO2, mmHg	80.15 ± 28.28	77.80 ± 25.87	0.743	0.458
	PCO2, mmHg	47.56 ± 14.21	46.26 ± 12.37	0.830	0.407
	SaO2, %	93.60 ± 6.75	93.68 ± 5.17	0.115	0.908
	BE, mmol/L	−5.04 ± 2.82	−4.50 ± 2.76	1.651	0.100
Post-surfactant
1 h	PH	7.35 ± 0.09	7.34 ± 0.09	0.524	0.600
	PO2, mmHg	75.72 ± 28.56	73.68 ± 20.89	0.685	0.494
	PCO2, mmHg	37.20 ± 10.85	38.89 ± 12.30	1.212	0.227
	SaO2, %	93.97 ± 6.18	94.38 ± 6.75	0.510	0.611
	BE, mmol/L	−4.53 ± 2.59	−4.15 ± 2.97	1.184	0.237
12 h	PH	7.34 ± 0.09	7.35 ± 0.10	1.103	0.271
	PO2, mmHg	76.29 ± 23.15	76.54 ± 22.91	0.094	0.925
	PCO2, mmHg	38.16 ± 9.38	38.39 ± 9.15	0.222	0.825
	SaO2, %	93.85 ± 5.24	94.79 ± 5.61	1.497	0.135
	BE, mmol/L	−3.81 ± 2.67	−3.37 ± 2.67	1.411	0.159

Data are expressed as mean ± SD. Comparisons were performed with Student's t test. PO₂, partial pressure of oxygen; PCO₂, the partial pressure of carbon dioxide; SaO₂, arterial saturation of peripheral oxygen; BE, base excess.