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Table 4 Distribution of the improvement of disability scores, comparing the cases to controls at each follow-up

From: Does partial coating with titanium improve the radiographic fusion rate of empty PEEK cages in cervical spine surgery? A comparative analysis of clinical data

  6 months 12 months 18 months
  25th % Median 75th % 25th % Median 75th % 25th % Median 75th %
Cases 8 14 22 16 20 31 20 26 34
Controls 8 12 16 14 18 22 18 24 30
p-value 0.223 0.163 0.071