Table 4.
Diagnostic performance of the magnetic resonance indicator for necrotizing fasciitis (MRINEC) algorithm.
| NF by MRINEC/Patients with NF (n = 34) |
SC by MRINEC/Patients with SC (n = 15) |
Sensitivity, % (95% CI) | Specificity, % (95% CI) |
PLR (95% CI) |
NLR (95% CI) |
|
|---|---|---|---|---|---|---|
| Total (n = 49) | 32/34 | 9/15 | 94 (80–99) | 60 (32–84) | 2.4 (1.3–4.4) |
0.1 (0.02–0.4) |
| High risk, LRINEC score ≥8 (n = 15) | 15/15 | 0 | 100 (78–100) | NA | 1.0 | NA |
| Intermediate risk, LRINEC score 6–7 (n = 5) | 3/3 | 0/2 | 100 (29–100) | 0 (0–84) | 1.0 | NA |
| Low risk, LRINEC score ≤5 (n = 29) |
14/16 | 9/13 | 88 (62–98) | 69 (39–91) | 2.8 (1.2–6.6) |
0.2 (0.05–0.7) |
Abbreviations: CI = confidence interval; MRINEC = magnetic resonance indicator for necrotizing fasciitis; NF = necrotizing fasciitis; NLR = negative likelihood ratio; PLR = positive likelihood ratio; SC = severe cellulitis.