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The Egyptian Journal of Otolaryngology

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 I

Group II

Group III

Group IV

Total

10–20 dB

N

23

21

33

19

96

20–30 dB

N

27

28

17

25

97

30–40 dB

N

0

1

0

6

7

Total

N

50

50

50

50

200

Chi-square

χ2

21.540

P value

0.001*

  1. *means (statistically significant)
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