Table 1.

Intra group comparison of hydrogen water group for aerobic culture

	n	Mean (CFU/ml)	SD	Minimum	Maximum	Median	Mean rank	χ2	P of Friedman’s test
Baseline	20	81.72×104	55.63×104	21×104	242×104	79.5×104	3.58
1 min	20	59.55×104	47.35×104	8×104	195×104	39.5×104	2.25	18.763	0.000**
2.5 min	20	45.72×104	30.51×104	5×104	130×104	46×104	1.83
5 min	20	53.55×104	38.71×104	11×104	130×104	43.5×104	2.33

**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