Table 2.

Intragroup comparison of hydrogen water group for anaerobic culture

	n	Mean (CFU/ml)	SD	Minimum	Maximum	Median	Mean rank	χ2	P of Friedman’s test
Baseline	20	115.2×104	74.11×104	25×104	252×104	100×104	3.61
1 min	20	75.2×104	44.92×104	20×104	190×104	72×104	2.28	18.400	0.000**
2.5 min	20	70.3×104	37.53×104	17×104	150×104	67×104	2.17
5 min	20	61.0×104	38.29×104	10×104	140×104	63.5×104	1.94

**P<0.01 Statistically highly significant difference. n – Number of samples; P – Level/test of significance; CFU/ml – Colony forming units per milliliter; SD – Standard deviation; χ²– Chi square value