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Table 2 Comparing Methods used to Calculate CDL in Various Studies

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

Method Years Where CDL is Being Measured Range of Values Mean Length # of Samples
OC LW OC LW OC LW OC LW
Direct 1884 – 2007 6 0 28.0 – 40.1 - 33.79 - 100  
Indirect 1921 – 2013 4 2 24.0 – 36.4 37.6 – 45.6 31.31 41.6 124 109
3D reconstruction 1989 – 2014 3 3 29.7 – 38.9 30.7 – 43.2 35.04 37.07 27 754
Spiral Coefficients 1998 – 2016 2a 1 29.07 – 37.45 30.76 – 37.41 33.92 37.41 46 148
  1. aCalculated at centroid of fluid filled space in CT image to represent OC measurements
  2. Means calculated by multiplying mean length by the number of samples, summating this value from each study using the selected method, and dividing by total number of samples analyzed with this method