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