Table 2 .

Results of 24 h pH-measurements in 21 patients

	Proximal mean % ± SD	Distal mean % ± SD
Total time pH < 4	0.2 ± 0.4	1.5 ± 2.2
Upright time pH < 4	0.2 ± 0.6	2.2 ± 3.3
Supine time pH < 4	0.0 ± 0.3	0.4 ± 1.0

SD standard deviation