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Table 2 EMG accuracy as a diagnostic criterion considering different threshold cutoffs

From: Diagnostic accuracy of perioperative electromyography in the positioning of pedicle screws in adolescent idiopathic scoliosis treatment: a cross-sectional diagnostic study

EMG Threshold Cutoff (mA) OVERALL AXIAL SAGITAL
10 Sn: 18% (9–30%) Sn: 14% (3–35%) Sn: 21% (10–36%)
Sp: 100% (98–100%) Sp: 97% (93–99%) Sp: 99% (97–100%)
NPV: 78% (72–83%) NPV: 90% (86–94%) NPV: 83% (78–88%)
PPV: 10%k (5–17%) PPV: 3% (1–8%) PPV: 9% (4–16%)
15 Sn: 38% (25–51%) Sn: 32% (14–55%) Sn: 42% (27–58%)
Sp: 85% (78–90%) Sp: 80% (74–86%) Sp: 84% (78–89%)
NPV: 80% (73–86%) NPV: 91% (86–95%) NPV: 86% (80–90%)
PPV: 15% (10–22%) PPV: 5% (2–10%) PPV: 13% (8–20%)
20 Sn: 48% (35–62%) Sn: 50% (28–72%) Sn: 49% (33–65%)
Sp: 72% (65–79%) Sp: 69% (62–75%) Sp: 71% (64–77%)
NPV: 81% (74–87%) NPV: 93% (87–96%) NPV: 86% (79–91%)
PPV: 16% (11–23%) PPV: 7% (3–11%) PPV: 13% (8–18%)
25 Sn: 70% (56–81%) Sn: 68% (45–86%) Sn: 67% (51–81%)
Sp: 48% (40–55%) Sp: 45% (38–52%) Sp: 46% (39–53%)
NPV: 83% (74–90%) NPV: 93% (86–97%) NPV: 86% (77–92%)
PPV: 18% (13–23%) PPV: 7% (4–11%) PPV: 13% (9–18%)
  1. Legend: Sn sensitivity, Sp specificity, NPV negative predictive value and PPV positive predictive value