Table 2.

Comparison of pain relief between 2 groups of patients (person).

	Control group (n = 101)	Experimental group-high concentration alkaline water (n = 100)	Experimental group—medium concentration alkaline water (n = 100)	Experimental group—low concentration alkaline water (n = 96)	H	P
Before treatment	4.57 (2.44, 7.25)	4.67 (2.06, 6.84)	5.75 (2.96, 7.30)	5.04 (2.39, 7.88)	13.27	.40
3 mo after treatment	4.07 (1.94, 6.75)	2.67 (0.07, 4.84)	4.25 (1.46, 5.80)	4.04 (1.39, 6.88)	45.75	6.42 × 10−10
6 mo after treatment	3.57 (1.44, 6.25)	0.67 (0.00, 2.84)	2.75 (0.00, 4.30)	3.04 (0.39, 5.88)	57.22	2.30 × 10−12
12 mo after treatment	3.07 (0.94, 5.75)	0.00 (0.00, 0.84)	1.25 (0.00, 2.80)	2.04 (0.00, 4.88)	119.34	1.07 × 10−25

Non-normal distribution data that do not conform to the normal distribution are described using the median (interquartile spacing) (M (P25, P75)) and independent sample Kruskal-Wallis H test. Perform inter-group comparisons for parameters with statistically significant differences.