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Table 2 Total number of ring types identified and the distribution based on their location on the trachea

From: Morphometric characterisation of human tracheas: focus on cartilaginous ring variation

Ring type Absolute # of rings (% of the total # of rings) % of specific ring type found
Upper 1/3 of trachea Middle 1/3 of trachea Lower 1/3 of trachea
A 86 (58) 34 49 17
B 13 (9) 31 31 38
C 8 (5) 38 12 50
D 4 (3) 25 50 25
E 2 (1) 50 50 0
F 1 (1) 0 100 0
G 6 (4) 83 17 0
H 3 (2) 100 0 0
I 6 (4) 0 0 100
J 3 (2) 67 33 0
K 1 (1) 0 0 100
L 14 (10) 50 36 14
Total 147 (100)