Table 2.

24-h esophageal pH monitoring in asphyxia (mean ± SD)

Groups	n	Acid reflux index	Reflux episodes	Episode > 5 min	Duration of longest episode pH < 4	Total time pH < 4	Area under pH < 4 curve	Esoph. clear time
Asphyxia	35	7.1 ± 1.3b	137 ± 24b	5.9 ± 1.1b	24.9 ± 8.0a	157 ± 32b	187 ± 62a	0.95 ± 0.12b
Mild	28	8.7 ± 1.5	167 ± 28			7.3 ± 1.3	30.3 ± 9.8	192 ± 37
Severe	7	0.8 ± 0.4d	19 ± 9d	0.9 ± 0.7d	3.4 ± 1.3c	19 ± 10d	17 ± 9d	0.76 ± 0.36
Control	17	1.3 ± 0.5	29 ± 11			0.7 ± 0.5	4.2 ± 1.7	20 ± 10

^aP < 0.05,

^bP < 0.01, vs control;

^cP < 0.05,

^dP < 0.01, vs mild asphyxia.