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Table 9 Statistical analysis of the incidence of ASD according to stabilization extension

From: Early developed ASD (adjacent segmental disease) in patients after surgical treatment of the spine due to cancer metastases

Pfirmann and Metzdorf Levels 4–6 Levels 7–9 P value
Grades 1 and 2 74 97 <0.05
Grades 3, 4, and 5 11 19 <0.05