All infants showed a metabolic acidosis at delivery , with similar umbilical artery pH in the control group ( mean + / - standard deviation , 6.79 + / - 0.25 ) , minimal cooling group ( 6.98 + / - 0.21 ) , and mild cooling group ( 6.93 + / - 0.11 ) , and depressed Apgar scores at 5 minutes in the control group ( 4.5 + / - 2 ) , minimal cooling group , ( 4.7 + / - 2 ) and mild cooling group ( 6.0 + / - 1 ) .
