Table 3.

Kruskal-Wallis H test results of association between equilibrium water content and pH.

Contact lens material	pH	n	mean rank	χ2	p value
etafilcon A	6.2	3	2.00	13.386	0.020*
	6.6	3	5.00
	7.0	3	9.83
	7.4	3	13.83
	7.8	3	14.67
	8.2	3	11.67
hilafilcon B	6.2	3	15.83	9.521	0.090
	6.6	3	12.33
	7.0	3	4.33
	7.4	3	10.67
	7.8	3	6.50
	8.2	3	7.33

*p < 0.05.