An optimized 13C-urea breath test for the diagnosis of H pylori infection

Table 2 Distribution of DOB values in H pylori positive and negative individuals for both protocols at 10, 20 and 30 min

H pylori-positive individuals
	10 min		20 min		30 min
	Protocol 1	Protocol 2	Protocol 1	Protocol 2	Protocol 1	Protocol 2
Mean	17.38	17.69	18.25	22.32	15.44	22.08
Median	13.64	12.02	12.63	17.07	10.98	17.50
SD	14.47	12.68	22.80	15.01	17.75	13.00
H pylori-negative individuals
	10 min		20 min		30 min
	Protocol 1	Protocol 2	Protocol 1	Protocol 2	Protocol 1	Protocol 2
Mean	0.32	0.33	0.11	0.45	0.21	0.62
Median	0.51	0.32	0.28	0.34	0.38	0.59
SD	0.91	0.8	0.77	0.86	0.84	0.91

DOB: Delta-over-baseline.