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Table 4 Fourfold data of CT criteria indicated CT scan had a sensitivity of 22% and a specificity of 96%

From: Pedicle screw loosening: the value of radiological imagings and the identification of risk factors assessed by extraction torque during screw removal surgery

CT scanning Loose Not loose p value
Positive 12 (22%) 5 (4%) 0.001a
Negative 43 (78%) 107 (96%)  
  1. Positive—no density zones around screw
  2. aChi-square test