TABLE 2.

Characteristics of different electrodes implanted in included studies

Brand	Name	Abbreviation Code in This Study	Type of Electrodea	Total Length in Millimetres	Active Length/Number of Active Electrodes	Spatial Distance Between Electrodes	Basal Diameter	Tip Diameter
Med-El	Standard	M1	S	31.5	26.4/12	2.4	1.2	0.5
	Flex 28	M2	S	28	23.1/12	2.1	0.8	0.48–0.36
	Flex 24	M3	S	24	20.9/12	1.9	0.8	0.48–0.36
	Medium	M4	S	24	20.9/12	1.9	0.8	0.38–0.36
Cochlear	Slim straight	C1	S	25	20/22	0.95	0.6	0.3
	Contour	C2	MH	18	15/22	0.71	0.8	0.5
	Contour advanced	C3	MH	18	15/22	0.71	0.8	0.5
Advanced Bionics	HiFocus 1	AB1	S	20	17/16	1.13	0.8	0.4–0.6
	HiFocus 1J	AB2	S	20	17/16	1.13		0.4–0.6
	Helix	AB3	MH	18.5	13.25/16	0.85	1.1	0.6
	Mid-Scala	AB4	MH	18.5	15/16	1.0	0.7	0.5

^aMH, modiolus hugging; precurved electrode; S, straight electrode.