Table 2. Mean ± SE of arterial blood gas values, sodium (Na⁺) and potassium (K ⁺) of preterm and term groups.

Variable	Groups		P value
	Preterm	Term
pH	7.07 ± 0.10	7.27 ± 0.10	0.020
pCO2 (mmHg)	85.52 ± 18.65	45.3 ± 12.62	0.001
pO2 (mmHg)	10.67 ± 5.65	35.67 ± 16.18	0.011
SO2 (%)	6.17 ± 5.85	47.00 ± 28.48	0.016
TCO2 (mmol/L)	27.67 ± 1.97	22.00 ± 5.97	0.069
HCO3- (mmol/L)	25.40 ± 1.98	20.73 ± 5.80	0.110
BE (mmol/L)	-3.50 ± 3.02	-5.00 ± 6.36	0.613
Na+ (mmol/L)	129.20 ± 40.26	143.20 ± 5.34	0.436
K+ (mmol/L)	4.72 ± 0.76	5.20 ± 2.08	0.611

pO²: oxygen pressure; pCO²: pressure of carbon dioxide; TCO ²: total carbon dioxide; HCO^3-: bicarbonate; BE: base excess; SO²: oxygen saturation.