TABLE 2

Parathyroid Lesion Localization: Effect of Lesion Weight

IndexPinholeParallel-holeDifference (%)χ2 (df = 1)Confidence interval (%)P
Group 1 (lesions > 840 mg)
 Sensitivity28/28 (100%)19/28 (68%)*328.415 to 490.003
 Specificity30/32 (94%)31/32 (97%)30.001−7 to +130.98
 Accuracy58/60 (97%)50/60 (83%)*145.14 to 240.04
 PPV28/30 (93%)19/20 (95%)20.09−11 to +150.76
 NPV30/30 (100%)31/40 (78%)*225.79 to 350.01
Group 2 (lesions < 840 mg)
 Sensitivity20/26 (77%)11/26 (42%)*355.210 to 600.03
 Specificity23/24 (96%)23/24 (96%)00.54−11 to +110.51
 Accuracy43/50 (86%)34/50 (68%)183.62 to 340.06
 PPV20/21 (95%)11/12 (92%)30.17−15 to +210.78
 NPV23/29 (79%)23/38 (61%)181.7−34 to +390.17
  • * P < 0.05 for parallel-hole collimator vs. pinhole collimator.

  • P < 0.05 for lesions > 840 mg vs. lesions < 840 mg.

  • df = degrees of freedom; PPV = positive predictive value; NPV = negative predictive value.