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Kruskal–Wallis test used to evaluate hemorrhage scores of three retraction systems
| Retraction systems | Number of abutments (N) | Mean rank |
|---|---|---|
| Stay-put | 20 | 48.75 |
| Expasyl | 20 | 14.63 |
| Magic foam cord | 20 | 28.13 |
| Test statisticsa,b | |
|---|---|
| Hemorrhage | |
| Chi-square | 44.448 |
| df | 2 |
| Significance (P) | 0.000 |
df degree of freedom
P value = level of significance
aKruskal Wallis test
bGrouping variable: retraction systems
