Table 3 . The Results of Tukey’s HSD Test .
| Group | N | Subset for Alpha = 0.05 | ||||
| 1 | 2 | 3 | 4 | |||
| Ch | 12 | 0.9358 | ||||
| Cu/LED | 12 | 5.5617 | ||||
| Cu | 12 | 6.8942 | ||||
| LED | 12 | 8.1058 | ||||
| Control | 12 | 8.5625 | ||||
| P value | 1.000 | 1.000 | 1.000 | .095 | ||
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