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Table 3 Supratubal recess (STR) grading in relation to sinus tympani (ST) types

From: Supratubal recess and sinus tympani: CT analysis of middle ear hidden areas

ST type

Type A

Type B

Type C

Total

P value

STR grade

Grade 1

4 (33%)

8 (67%)

0 (0%)

12 (6%)

0.3 NS

X2 = 4.874

Grade 2

41 (25.6%)

118 (73.8%)

1 (0.6%)

160 (80%)

Grade 3

11 (39%)

16 (57%)

1 (4%)

28 (14%)

Total

56 (28%)

142 (71%)

2 (1%)

200 (100%)

 
  1. NS non-significant, X2 chi-square