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Table 2 Diagnostic accuracy of nurse practitioner diagnosis of suspected tuberculosis, compared to primary care physician diagnoses of suspected tuberculosis, and tuberculosis

From: Diagnostic accuracy of an integrated respiratory guideline in identifying patients with respiratory symptoms requiring screening for pulmonary tuberculosis: a cross-sectional study

  Tuberculosis suspected by the primary care physician Tuberculosis diagnosed by the primary care physician
True positives 276 36
False positives 240 462
False negatives 89 4
True negatives 787 867
Sensitivity % (95%CI) 76 (71–79) 90 (76–97)
Specificity % (95%CI) 77 (74–79) 65 (63–68)
Positive predictive value % (95%CI) 53 (49–58) 7 (5–10)
Negative predictive value % (95%CI) 90 (88–92) 99.5 (98.8–99.8)
Likelihood ratio for positive test 3.2 2.6
Likelihood ratio for negative test 0.31 0.15
Area under the ROC curve (95%CI) 0.76 (0.74–0.79) 0.78 (0.73–0.82)