Table 2.
Means and standard deviations of the strength variable of the study groups
| Group | N | Mean | Std. Deviation | Std. Error | 95% Confidence Interval for Mean | Min. | Max. | p | |
|---|---|---|---|---|---|---|---|---|---|
| Lower Bound | Upper Bound | ||||||||
| Control | 10 | 16.8000 | 4.65666 | 1.47256 | 13.4688 | 20.1312 | 10.80 | 22.70 | <.001 |
| Acid etch | 10 | 15.2000 | 3.61017 | 1.14164 | 12.6174 | 17.7826 | 11.20 | 19.80 | |
| Al2O3 | 10 | 28.4000 | 8.10322 | 2.56246 | 22.6033 | 34.1967 | 19.40 | 37.20 | |
| Bur | 10 | 25.1000 | 5.56936 | 1.76119 | 21.1159 | 29.0841 | 18.30 | 31.70 | |
| Er YAG | 10 | 18.0200 | 3.86603 | 1.22255 | 15.2544 | 20.7856 | 13.40 | 23.70 | |
| Er-Cr YSGG | 10 | 17.2200 | 3.36016 | 1.06258 | 14.8163 | 19.6237 | 12.60 | 21.80 | |