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Correlation between LBP and number of HIZ disks per patient (n = 200 patients)
| Number of HIZ disks per patient | n | LBP | χ2 | P value | ||
|---|---|---|---|---|---|---|
| Symptomatic patients | Asymptomatic patients | % | ||||
| 1 | 167 | 93 | 74 | 55.7 | 1.359* | 0.244 |
| 2 | 29 | 18 | 11 | 62.0 | ||
| 3 | 3 | 3 | 0 | 100.0 | ||
| 4 | 1 | 1 | 0 | 100.0 | ||
* Compared single HIZ disk group with multiple HIZ disks group (2–4 HIZ disks/patient)
