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Kruskal-Wallis H test results of association between refractive power and pH.
| Contact lens material | pH | n | mean rank | χ2 | p value |
|---|---|---|---|---|---|
| etafilcon A | 6.2 | 3 | 2.00 | 13.709 | 0.018* |
| 6.6 | 3 | 5.00 | |||
| 7.0 | 3 | 11.00 | |||
| 7.4 | 3 | 10.17 | |||
| 7.8 | 3 | 13.83 | |||
| 8.2 | 3 | 15.00 | |||
| hilafilcon B | 6.2 | 3 | 10.00 | 6.382 | 0.271 |
| 6.6 | 3 | 7.50 | |||
| 7.0 | 3 | 8.00 | |||
| 7.4 | 3 | 5.00 | |||
| 7.8 | 3 | 12.00 | |||
| 8.2 | 3 | 14.50 |
*p < 0.05.
