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Table 3 Performance of the LAMS tool (cut-off value, ≥4) in identification of LVO and LVO or ICH

From: Effects of state-wide implementation of the Los Angeles Motor Scale for triage of stroke patients in clinical practice

  All patientsa (n = 920) Patients with strokeb (n = 547)
Variable, n/total n (%) LVO LVO or ICH LVO LVO or ICH
Sensitivity 52/77 (67.5; 57.1–78.0) 90/159 (56.6; 48.9–64.3) 52/77 (67.5; 57.1–78.0) 90/158 (57.0; 49.2–64.7)
Specificity 704/843 (83.5; 81.0–86.0) 660/761 (86.7; 84.3–89.1) 366/470 (77.9; 74.1–81.6) 323/389 (83.0; 79.3–86.8)
Positive predictive value 52/191 (27.2; 20.9–33.5) 90/191 (47.1; 40.0–54.2) 52/156 (33.3; 25.9–40.7) 90/156 (57.7; 49.9–65.4)
Negative predictive value 704/729 (96.6; 95.3–97.9) 660/729 (90.5; 88.4–92.7) 366/391 (93.6; 91.2–96.0) 323/391 (82.6; 78.9–86.4)
  1. LAMS Los Angeles Motor Scale, LVO Large-vessel occlusion, ICH Intracranial haemorrhage; Independently of having received vascular imaging, patients with ICH or stroke mimics are classified as LVO-negative
  2. a 60 of 1123 (5.3%) patients had no documented LAMS score, and 155 of 644 (24.1%) ischaemic stroke patients did not undergo vascular imaging; b 38 of 728 (5.2%) patients had no documented LAMS score, and 155 of 644 (24.1%) ischaemic stroke patients did not undergo vascular imaging
  3. 95% confidence intervals are reported in brackets