Identification of lumbar disc disease hallmarks: a large cross-sectional study

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Table 3 Lumbar segment impact on each phenotype

Phenotypes	L1–L4 (%)	L4–S1 (%)	χ²	P
A	9873 (62.2)	4157 (39.3)	1339.9	0.000*
B	1905 (12.0)	1018 (9.6)	36.7	0.000*
C	2096 (13.2)	1937 (18.3)	127.7	0.000*
D	846 (5.3)	1433 (13.5)	543.8	0.000*
E	646 (4.1)	1307 (12.4)	636.8	0.000*
F	121 (0.8)	335 (3.2)	216.5	0.000*
G	295 (1.9)	852 (8.1)	587	0.000*
H	25 (0.2)	85 (0.8)	63.9	0.000*
I	9 (0.1)	74 (0.7)	83.8	0.000*
J	202 (1.3)	34 (0.3)	65	0.000*
K	1 (0.0)	10 (0.1)	11.9	0.001**
L	3 (0.0)	31 (0.3)	37.1	0.000*
M	0 (0.0)	1 (0.0)	0.221	0.400
N	23 (0.1)	13 (0.1)	0.227	0.384
O	71 (0.4)	35 (0.3)	2.162	0.141
P	29 (0.2)	99 (0.9)	74.7	0.000*
Total	16,145 (100)	11,421 (100)

Pathologic types D–L and P occurred more frequently in lower lumbar discs than upper lumbar discs; Whereas A–C and J (normal, blurred disc as early stage of LDD and Schmorl node) occurred more frequently in upper lumbar discs
* P < 0.0001;** P < 0.05