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. 2018 Oct 29;13(10):e0206125. doi: 10.1371/journal.pone.0206125

Table 3. The grade of lumbar disc degeneration at each lumbar vertebral level in 2014, as defined by the Pfirrmann classification*.

2014
Pfirrmann classification		 Grade Ⅰ Grade Ⅱ Grade Ⅲ Grade Ⅳ
L1/2 11 1 0 0
L2/3 12 0 0 0
L3/4 12 0 0 0
L4/5 11 1 0 0
L5/S1 12 0 0 0

*There were only 2 cases of Grade Ⅱ lumbar disc degeneration.