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Table 1 Validity indices (95% confidence interval) for three commonly used methods of detecting catheter-related bloodstream infection

From: Use of rapid diagnostic techniques in ICU patients with infections

Measure Semiquantitative superficial cultures Differential quantitative blood cultures Differential time to positivity
Sensitivity 78.6 (59.0-91.7) 71.4 (51.3-86.8) 96.4 (81.7-99.9)
Specificity 92.0 (87.0-95.6) 97.7 (94.3-99.4) 90.3 (85.0-94.3)
Positive predictive value 61.1 (43.5-76.9) 83.3 (62.6-95.3) 61.4 (45.5-75.6)
Negative predictive value 96.4 (92.4-98.7) 95.6 (91.4-98.1) 99.4 (96.6-99.9)
Accuracy 90.2 (85.3-93.9) 94.1 (90.0-96.9) 91.2 (86.4-94.7)
  1. From reference [31].