Table 3 Association between intradiscal vacuum phenomena (VPs) and lumbar spinal 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 | Â | |
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 | Â | |
Corrected P-value | 0.23 | 0.51 | 0.34 | 0.89 | Â | |
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 | Â | |
Corrected P-value | 0.03 | 0.35 | 0.74 | 0.0022 | Â | |
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 | Â | |
Corrected P-value | 0.0001 | 0.41 | 0.005 | 0.025 | Â | |
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 | Â | |
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 | Â | |
Corrected P-value | 0.14 | 0.60 | 0.77 | 0.02 | Â | |
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 | Â | |
Corrected P-value | 0.0039 | 0.013 | 0.48 | 0.09 | Â | |
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 | Â | |
Corrected P-value | 0.0019 | 0.07 | 0.005 | 0.0001 | Â | |
A-N-P | Count (% raw) | 9 (52.9%) | 0 (0%) | 8 # (47.1%) | 0 (0%) | 17 |
| Â | Exp. Count | 12.0 | 1.1 | 2.5 | 1.4 | Â |
| Â | Corrected P-value | 0.1 | 0.27 | 0.00015 | 0.21 | Â |