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Plasma osteopontin levels according to the clusters.
| Clusters | n (%) | OPN (ng/mL) | Test Statistic (df) | p * | |
|---|---|---|---|---|---|
| Median | 25–75% | ||||
| Cluster 1: N1 neck | 8 (23.5) | 10.4 | 6.2 to 14.3 | 5.045 (2) | 0.08 |
| Cluster 2: N2a and N2c neck status | 12 (35.3) | 15.4 | 8.4 to 58.2 | ||
| Cluster 3: N2b | 14 (41.2) | 43.9 | 17.8 to 74.7 | ||
Abbreviations: *: Kruskal Wallis test (Post-hoc Conover); OPN: osteopontin.
