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TABLE 1: 
Demographic stratification
CriterionGroup 1Group 2
No. of patients2424
 Men58
 Women1916
Patient age (y)74 (52–92)73 (47–87)
Level4242
 Mid thoracic, T5–T8710
 Lower thoracic, T9–T12813
 Upper lumbar, L1–L31713
 Lower lumbar, L4–L5106
Compression (%)30.4 (10–70)33.6 (5–90)
Amount of PMMA (mL)4.653.09
Approach
 Unipediculate2737
 Bipediculate155
  • Note.—Data in parentheses are ranges.