Table 1. Number and age of subjects in each group

	Normal (SD)	PET (SD)	ETD (SD)
N (ear)	147	81	41
Age	43.41 (15.066)	42.32 (16.793)	46.32 (16.976)

SD: standard deviation, PET: patulous eustachian tube dysfunction, ETD: dilatory eustachian tube dysfunction.