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Table 3 Association between intradiscal vacuum phenomena (VPs) and lumbar spinal stenosis

From: Morphology of intervertebral disc ruptures evaluated by vacuum phenomenon using multi-detector computed tomography: association with lumbar disc degeneration and canal stenosis

A: Shape MRI classification of lumbar spinal stenosis Total
A B C D
VP (−) Count
(% raw)
171 *
(81.8%)
9
(4.3%)
22
(10.5%)
7 *
(3.3%)
209
Exp. Count 147.5 13.1 31.3 17.1  
Corrected
P-value
< 0.0001 0.07 0.006 < 0.0001  
Spot Count
(% raw)
21
(61.8%)
3
(8.8%)
7
(20.6%)
3
(8.8%)
34
Exp. Count 24.0 2.1 5.1 2.8  
Corrected
P-value
0.23 0.51 0.34 0.89  
Linear Count
(% raw)
21
(55.3%)
4
(10.5%)
5
(13.2%)
8 *
(21.1%)
38
Exp. Count 26.8 2.4 5.7 3.1  
Corrected
P-value
0.03 0.35 0.74 0.0022  
Island Count
(% raw)
46 *
(53.5%)
7
(8.1%)
21
(24.4%)
12
(14.0%)
86
Exp. Count 60.7 5.4 12.9 7.0  
Corrected
P-value
0.0001 0.41 0.005 0.025  
B: Distribution MRI classification of lumbar spinal stenosis Total
A B C D
VP (−) Count
(% raw)
171 #
(81.8%)
9
(4.3%)
22
(10.5%)
7 #
(3.3%)
209
Exp. Count 147.5 13.1 31.3 17.1  
Corrected
P-value
< 0.0001 0.07 0.006 < 0.0001  
A-N Count
(% raw)
41
(63.1%)
5
(7.7%)
9
(13.8%)
10
(15.4%)
65
Exp. Count 45.9 4.1 9.7 5.3  
Corrected
P-value
0.14 0.60 0.77 0.02  
N Count
(% raw)
26
(53.1%)
7
(14.3%)
9
(18.4%)
7
(14.3%)
49
Exp. Count 34.6 3.1 7.3 4.0  
Corrected
P-value
0.0039 0.013 0.48 0.09  
N-P Count
(% raw)
12 #
(44.4%)
2
(7.4%)
7
(25.9%)
6
(22.2%)
27
Exp. Count 19.1 1.7 4.0 2.2  
Corrected
P-value
0.0019 0.07 0.005 0.0001  
A-N-P Count
(% raw)
9
(52.9%)
0
(0%)
8 #
(47.1%)
0
(0%)
17
  Exp. Count 12.0 1.1 2.5 1.4  
  Corrected
P-value
0.1 0.27 0.00015 0.21  
  1. The results of a contingency-table test are presented. A: VP shape analysis. B: VP distribution analysis. Percentages of the raw marginal total (% raw) are in parentheses. Exp. Count: expected count; VP (−): non-ruptured group; Nucleus pulposus: N; anterior annulus fibrosus: A; and posterior annulus fibrosus: P. *P < 0.0025, #P < 0.002 (by Bonferroni correction). The cells with counts above or below the expected count with statistical significance are shown in bold