Eustachian tube function testing
Eustachian tube function (ETF) was measured by Tubomanometer
(Spiggle&Theis, Medizintechnik). An extended test of Eustachian Tube
Score (ETS-7) was used which combines subjective (clicking sound when
swallowing, Valsalva) and objective (tubomanometry, tympanometry)
measures of ETF (Supplemental table2). The total score of ETS-7 is 10
points and ETS-7≤7 would be diagnosed as ETD.