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Table 5 Clinical scores and their associated probabilities of true bacteremia, sensitivity, and specificity

From: Development of a prediction model for bacteremia in hospitalized adults with cellulitis to aid in the efficient use of blood cultures: a retrospective cohort study

Clinical score Probabilities of true bacteremia (%)a Percentage correctly having blood culture(s) (sensitivity)b Percentage correctly rejecting blood culture(s) (specificity)c
7.0 N/A 0 100
6.0 N/A 0 100
5.5 66.7 (2/3) 6.1 99.7
5.0 38.6 (5/13) 15.2 97.5
4.5 42.1 (8/19) 24.2 96.5
4.0 41.2 (14/34) 42.4 93.7
3.5 32.1 (27/84) 81.8 82.1
3.0 31.0 (27/87) 81.8 81.1
2.5 21.6 (30/139) 90.9 65.7
2.0d 20.7 (31/150) 93.9 62.6
1.5 17.4 (32/184) 97 52.2
1.0 11.9 (32/269) 97 25.5
0 9.4 (33/351) 100 0
  1. aIndicates the probabilities of true bacteremia in cellulitis cases using the clinical score in that row as a cut-off point to determine whether to order a blood culture. In parenthesis are the number of cellulitis cases with true bacteremia (numerator) and total number of cellulitis cases (denominator) using the clinical score in that row as a cut-off point
  2. bFraction of patients with true bacteremia who would correctly have blood culture(s) if the clinical score in that row was used as a cut-off point
  3. cFraction of patients without true bacteremia who would correctly reject blood culture(s) if the clinical score in that row was used as a cut-off point
  4. dClinical score of 2.0 was used to illustrate its use for decision-making