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Table 3 Influenza diagnosis (ICD-10-AM J09-J11) versus laboratory test results by time of test result availability

From: Evaluation of the accuracy of diagnostic coding for influenza compared to laboratory results: the availability of test results before hospital discharge facilitates improved coding accuracy

Influenza diagnosis Test results received before discharge (n = 14,285) Test results after discharge (n = 2154)
PCR+ PCR− Total PCR+ PCR− Total
ICD10+ 2280 132 2412 101 14 115
ICD10− 170 11,703 11,873 208 1831 2039
Total 2450 11,835 14,285 309 1845 2154
Accuracy measures       
 Sensitivity (95% CI) 93.1 (92.0–94.0)    32.7 (27.5–38.2)   
 Specificity (95% CI) 98.9 (98.7–99.1)    99.2 (98.7–99.6)   
 PPV (95% CI) 94.5 (93.5–95.4)    87.8 (80.4–93.2)   
 NPV (95% CI) 98.6 (98.3–98.8)    89.8 (88.4–91.1)   
  1. PPV positive predictive value, NPV negative predictive value