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A significant decline in hearing outcome was shown starting around the second decade of deafness corresponding to 66% of life spent in deafness. MR imaging of cochlear nerve diameter shows a positive correlation of larger nerve diameter to better speech understanding. Promontory stimulation testing did not show any prognostic value. In this retrospective review it could be shown that there is an intricate interaction in the preoperative variables duration of deafness - as well as the ratio of life spent in deafness; residual hearing; an