Table 3.
PTA distribution in two groups of patients studied
| Ab gap(PRE OP) | Button hole | Underlay |
|---|---|---|
| < 30dB HL | 10(16.7%) | 12(13.3%) |
| 30–40 dB | 20(83.3%) | 18(86.7%) |
| TOTAL | 30 | 30 |
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