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Table 1 Subject demographics for each subject group. Note: For continuous variables, the mean and + 1 standard deviation are shown in brackets

From: Electrophysiological measurements with electrode types of different perimodiolar properties and the same cochlear implant electronics – a retrospective comparison study

Subject group 532 512 522
Device CI532 CI512 CI522
Electrode type Slim modiolar Contour advance Slim straight
Number of patients 46 45 48
Number of ears 54 54 51
Age (year) 25.17±26.29 20.80±25.87 55.36±28.59
Sex (male/female) 25/29 23/31 33/18
Duration of deafness (year) 2.94±7,46 3.06±9.34 3.13±12.99
Cause of deafness
 Congenital 29% 28% 17%
 Progressive 22%, 26% 23%
 Unknown 16% 28% 35%
 Others 33% 17% 25%