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Table 1 Comparing CDL measurements made by multiple studies

From: Measuring Cochlear Duct Length – a historical analysis of methods and results

Authors

Year

Location of CDL

Modality

Method

# of Samples

Mean (SD)

Range of Values

Retzius

1884

OC

Histology

Direct

5

33.5 (0.8)

32 – 34

Hardy

1938

OC

Histology

Indirect

68

31.52 (2.3)

25.26 – 35.45

Bredberg

1968

OC

Histology

Direct

35

34.0 (1.3)

30.3 – 37.6

Walby

1985

OC

Histology

Indirect

20

32.6 (2.1)

30.1 – 36.4

Ulehlova et al.

1987

OC

Histology

Direct

50

34.2 (2.9)

28.0 – 40.1

Pollak et al.

1987

OC

Histology

Indirect

9

28.4 (3.4)

24.0 – 33.5

Wright et al.

1987

OC

Histology

Direct

14

32.9 (2.6)

28.8 – 36.6

Takagi & Sando

1989

OC

Histology

3D reconstruction

1

36.4 (n/a)

-

Sato et al.

1991

OC

Histology

3D reconstruction

18

34.73 (2.9)

29.7 – 38.9

Kawano et al.

1996

OC

Histology

3D reconstruction

8

35.58 (1.4)

34.2 – 37.9

LW

Histology

3D reconstruction

8

40.81 (2.0)

37.93 – 43.81

Ketten et al.

1998

OCa

In vivo CT

Spiral coefficients

20

33.01 (2.3)

29.07 – 37.45

Skinner et al.

2002

OCa

In vivo CT

Spiral coefficients

26

34.62 (1.2)

32.94 – 36.57

Sridhar et al.

2006

OC

Histology

Direct

7

33.31 (2.4)

30.5 – 36.87

Stakhovskaya et al.

2007

OC

Histology

Direct

9

33.13 (2.1)

30.5 – 36.87

Erixon et al.

2009

LW

Plastic casts

Indirect

58

42.0 (2.0)

38.6 – 45.6

Lee et al.

2010

OC

Histology

Indirect

27

30.8 (2.6)

25.5 – 35.1

Erixon & Rask-Anderson

2013

LW

Plastic casts

Indirect

51

41.2 (1.9)

37.6 – 44.9

Wurfel et al.

2014

LW

In vivo CBCT

3D reconstruction

436

37.9 (2.0)

30.8 – 43.2

Meng et al.

2016

LW

In vivo CT

3D reconstruction

310

35.8 (2.0)

30.7 – 42.2

  1. aMeasured LW and interpolated into the OC location