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Table 1: 
Characteristics of patients in both bilaterally filled vertebroplasty and unilateral hemivertebroplasty groups
HemivertebroplastyBilateral Vertebroplasty
Single LevelMultiple LevelSingle LevelMultiple Level
No. of patients (levels)11 (11)31 (76)441 (441)236 (521)
Percentage female55657066
Median age by year (range)69 (50–86)71 (51–97)77 (31–96)76 (34–96)
Mean cement volume2.12.13.42.97