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

Table 2 Comparing Methods used to Calculate CDL in Various Studies

Method	Years	Where CDL is Being Measured		Range of Values		Mean Length		# of Samples
Method	Years	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	2^a	1	29.07 – 37.45	30.76 – 37.41	33.92	37.41	46	148

^aCalculated at centroid of fluid filled space in CT image to represent OC measurements
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

ISSN: 1916-0216