Table 3.
Descriptive and statistical test of the diameter of inhibition zone of Mutans streptococci between extracts concentrations. (10 isolates)
| Concentration | Extract | Minimum | Maximum | Mean | ±SD | F | P-value* |
|---|---|---|---|---|---|---|---|
| 50 | Black tea | 8.000 | 9.000 | 8.500 | 0.333 | 214.582 | 0.000 |
| Green tea | 11.000 | 12.000 | 11.450 | 0.438 | |||
| 100 | Black tea | 11.000 | 12.000 | 11.550 | 0.369 | 221.918 | 0.000 |
| Green tea | 14.000 | 15.500 | 14.550 | 0.497 | |||
| 200 | Black tea | 15.000 | 16.500 | 15.750 | 0.486 | 10.418 | 0.002 |
| Green tea | 16.000 | 17.000 | 16.400 | 0.394 | |||
| 300 | Black tea | 17.000 | 18.000 | 17.550 | 0.438 | 19.973 | 0.000 |
| Green tea | 18.000 | 19.000 | 18.450 | 0.438 | |||
| 500 | Black tea | 21.500 | 23.000 | 22.500 | 0.527 | 12.082 | 0.001 |
| Green tea | 22.500 | 24.000 | 23.200 | 0.537 |
*=significant at P<0.05