Rothenberg et al. (A-13) investigated the effectiveness of using the Hologic Sahara Sonometer, a portable device that measures bone mineral density (BMD) in the ankle, in predicting a fracture.

They used a Hologic estimated bone mineral density value of .57 as a cutoff. The results of the investigation yielded the following data:

(a) Calculate the sensitivity of using a BMD value of .57 as a cutoff value for predicting fracture and interpret your results.

(b) Calculate the specificity of using a BMD value of .57 as a cutoff value for predicting fracture and interpret your results.

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Confirmed Fracture Present (D) Not Present (D) Total BMD = .57 (T) BMD 214 670 884 .57 (T) 73 330 403 Total 287 1000 1287