24-Hour Measurement of Gastric pH in Rural South Africa

Table 2

Other studies of healthy subjects.

Authors	Tutuian et al. [16]	Hartmann et al. [24]	Piccoli et al. [18]	Huang et al. [23]	Roman et al. [22]	This study
Female/male	20/16	0/20	19/17	0/74	6/6	26/18
Country	USA	Germany	Switzerland	Canada	France	South Africa
HP +ve	Not stated	7 of 20 +ve	Not stated	Not stated	Not stated	35 of 36
Mean/median 24 hr pH	2.05	1.4	1.3	2.39		2.84
Median daytime pH	2.8					2.67
Median nighttime pH	1.38					3.7
Nighttime pH >4	8.14%					9.40%
24 hr pH >4	20.03%		8.80%		14.50%	22.20%
Supine time pH >4					4.40%	26%