Table 4.
Kruskal-Wallis H test results of association between state of water and pH.
| Contact lens material | pH | n | mean rank | χ2 | p value | |
|---|---|---|---|---|---|---|
| Wnf | etafilcon A | 6.2 | 3 | 10.67 | 4.415 | 0.491 |
| 6.6 | 3 | 9.67 | ||||
| 7.0 | 3 | 12.00 | ||||
| 7.4 | 3 | 12.00 | ||||
| 7.8 | 3 | 8.33 | ||||
| 8.2 | 3 | 4.33 | ||||
| hilafilcon B | 6.2 | 3 | 16.00 | 7.971 | 0.158 | |
| 6.6 | 3 | 5.33 | ||||
| 7.0 | 3 | 7.67 | ||||
| 7.4 | 3 | 6.67 | ||||
| 7.8 | 3 | 9.67 | ||||
| 8.2 | 3 | 11.67 | ||||
| Wfb | etafilcon A | 6.2 | 3 | 4.33 | 8.485 | 0.131 |
| 6.6 | 3 | 9.00 | ||||
| 7.0 | 3 | 6.67 | ||||
| 7.4 | 3 | 8.67 | ||||
| 7.8 | 3 | 13.33 | ||||
| 8.2 | 3 | 15.00 | ||||
| hilafilcon B | 6.2 | 3 | 3.67 | 8.228 | 0.144 | |
| 6.6 | 3 | 14.33 | ||||
| 7.0 | 3 | 10.33 | ||||
| 7.4 | 3 | 12.67 | ||||
| 7.8 | 3 | 9.67 | ||||
| 8.2 | 3 | 6.33 | ||||
| Wff | etafilcon A | 6.2 | 3 | 14.33 | 8.289 | 0.141 |
| 6.6 | 3 | 6.67 | ||||
| 7.0 | 3 | 11.33 | ||||
| 7.4 | 3 | 11.33 | ||||
| 7.8 | 3 | 3.17 | ||||
| 8.2 | 3 | 10.17 | ||||
| hilafilcon B | 6.2 | 3 | 15.00 | 8.219 | 0.145 | |
| 6.6 | 3 | 7.00 | ||||
| 7.0 | 3 | 7.00 | ||||
| 7.4 | 3 | 7.17 | ||||
| 7.8 | 3 | 6.67 | ||||
| 8.2 | 3 | 14.17 |