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Table 4 Test characteristics for various thresholds of the MRSA score and the HCA risk factors on the validation set

From: Development and validation of a bedside risk score for MRSA among patients hospitalized with complicated skin and skin structure infections

MRSA score (0 to 8) Sensitivity Specificity Positive predictive value Negative predictive value Overall prevalence of patients with the score value or higher in the validation set
2 95.2% 7.7% 35.3% 75.3% 93.3%
3 80.2% 30.9% 38.0% 74.7% 72.9%
4** 61.6% 58.6% 44.0% 74.3% 48.4%
5* 44.8% 75.9% 49.6% 72.3% 31.2%
6 17.0% 90.4% 48.3% 67.4% 12.2%
7 or 8 2.8% 99.4% 70.0% 65.9% 1.4%
HCA risk factors 32.0% 64.5% 32.3% 64.3% 34.3%
  1. *MRSA score of 5 or higher is superior to HCA risk factors on all classification metrics.
  2. **MRSA Score of 4 or higher is superior to HCA risk factors on all metrics but specificity.
  3. MRSA=methicillin-resistant S. aureus; HCA=healthcare associated.