Table 3.
Dependence of the Visual Analogue Scale (VAS) and Neck Disability Index (NDI) values on degree of subsidence. a—statistical analysis using Mann–Whitney test; b—statistical analysis using Kruskal–Wallis test. Statistically significant results in bold.
| Subsidence | VAS Score after 12 Months | NDI Score after 12 Months | |||||||
|---|---|---|---|---|---|---|---|---|---|
| n (%) | Mean [pts] | Median [pts] | Z Coefficient a | p Value a | Mean [pts] | Median [pts] | Z Coefficient a | p Value a | |
| Y | 82 (52.2%) | 2.3 | 2.0 | −1.59 | 0.1123 | 12.4 | 9.0 | −2.56 | 0.0105 |
| N | 75 (47.8%) | 2.0 | 1.5 | 8.51 | 7.0 | ||||
| Subsidence Degree [mm], n | Mean [pts] | H Coefficient b | p Value a | Mean [pts] | H Coefficient b | p Value b | |||
| ≥2 and <3 | 34 | 1.9 | 1.52 | 0.4733 | 10.7 | 7.84 | 0.0459 | ||
| ≥3 and <4 | 32 | 2.2 | 11.9 | ||||||
| ≥4 | 16 | 2.5 | 13.5 | ||||||