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Table 1 Preoperative ABG for all patients

From: Do mastoidectomy and type of graft affect tympanoplasty outcome in Egyptian children? A prospective randomized study

ABG (pre)Groups
Group IGroup IIGroup IIIGroup IVTotal
10–20 dBN2321331996
20–30 dBN2728172597
30–40 dBN01067
TotalN50505050200
Chi-squareχ221.540
P value0.001*
  1. *means (statistically significant)
\