Changes of dental PHP index
| Group | Base | 3 day | 5 day | 4 wks | 8 wks | |
|---|---|---|---|---|---|---|
| Exp.group | mean | 2.17 | 2.09 | 2.02 | 1.90 | 1.63 |
| SD | 0.50 | 0.46 | 0.45 | 0.44 | 0.40 | |
| Con. group | mean | 2.13 | 2.09 | 2.09 | 1.96 | 1.95 |
| SD | 0.36 | 0.42 | 0.39 | 0.34 | 0.33 | |
| p-value |
.692 | .982 | .575 | .600 | .002 |
SD: standard deviation, Exp: experimental group, Con: control group.
+p-value by 2 sample t-test.
*p<0.05 by paired t-test between base and after.
