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Table 2 Comparison between the 3 groups as regards follow-up tympanogram data using chi-square test

From: Effect of head and neck radiotherapy on the Eustachian tube functions

Variable Glottic group (20) Sub-glottic group (3) Supra-glottic group (7) Chi-square test
p value
Tympanogram before treatment in both ears Normal 20 (100%) 3 (100%) 7 (100%)  
Tympanogram (end of ttt) (contralateral) A—Normal 15 (75%) 3 (100%) 4 (57.1%) = 0.3761
B—Effusion 2 (10%) 0 (0%) 0 (0%)
C—ET dysfunction 3 (15%) 0 (0%) 3 (42.9%)
Tympanogram (end of ttt) (ipsilateral) A—Normal 10 (50%) 1 (33.3%) 3 (42.9%) = 0.037*
B—Effusion 2 (10%) 0 (0%) 4 (57.1%)
C—ET dysfunction 8 (40%) 2 (66.7%) 0 (0%)
Tympanogram (12 weeks) (contralateral) A—Normal 16 (80%) 3 (100%) 6 (85.7%) = 0.8160
B—Effusion 2 (10%) 0 (0%) 0 (0%)
C—ET dysfunction 2 (10%) 0 (0%) 1 (14.3%)
Tympanogram (12 weeks) (ipsilateral) A—Normal 15 (75%) 2 (66.7%) 5 (71.4%) = 0.0744
B—Effusion 0 (0%) 0 (0%) 2 (28.6%)
C—ET dysfunction 5 (25%) 1 (33.3%) 0 (0%)
  1. *Percentage of Column Total