Using the MMS-10 tympanic displacement analyser, the test-retest varia
tion was determined in 20 normal hearing ears (ten subjects) for the m
easurement parameters Vi and Vm. Variations were found to be on averag
e 60 nl for Vi and 72 nl for Vm. The consequences of these substantial
test-retest variabilities for the applicability of the device and int
erpretation of the measurement results are discussed.