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Table 4: Analysis of refractures within 1 year
Percentage of Patients Having a Second Treatment Session Within 1 y of Initial Procedure Percentage of Refractured Patients Having a Third Treatment Session Within 1 y of Initial Procedure Average Available Cement Volumes for Patients Refracuring Within 1 y of Initial Procedure (cc) Average Time Between Treatment Sessions for Refracturing Patients Within 1 y of Initial Procedures
No. of Patients Having Initial Procedure No. Refractured (2nd Procedure) % Refracturing No. Refractured (2nd Procedure) No. Refractured (3rd Procedure) % of Refractured Patients Having 3rd Procedure Δt Between 1st and 2nd procedure wk Δt Between 2nd and 3rd procedure wk
Primary osteoporosis 350 72 20.6 72 23 31.9% 5.18 ± 2.58 11.3 12
Steroid-induced osteoporosis 37 14 37.8 14 6 42.9% 5.97 ± 3.02 7.93 10.8
Total 387 86 22.2 86 29 33.7% 
Relative risk 1.84 1.34^† 
P value .0163 .3094 
* Chi-squared analysis.
† Fisher exact test.