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Risk ratio for instability of arch bars in the two groups
| Unstable arch bars (score=0, 1, 2) |
Stable arch bars (score=3) | Total | |
|---|---|---|---|
| EAB | 19 (a) | 2 (b) | 21 (a+b) |
| hAB | 6 (c) | 14 (d) | 20 (c+d) |
| Relative risk | (a/a+b)/(c/c+d) | 3.016 | |
(EAB: Erich arch bar, hAB: hybrid arch bar)
