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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Stroke. 2014 Mar 18;45(5):1275–1279. doi: 10.1161/STROKEAHA.113.003955

Table 2.

Differences between EMS-reported and neurologist-determined LKN Times and IV tPA error rates

All Acute Stroke Pager Activations
n = 251		 Patients with ED Diagnosis of Stroke
n = 86		 IV tPA – Treated Stroke Patients
n = 32		 Non IV tPA-Treated Stroke Patients
n = 54
|ΔLKN|*, mean ± SD 28 ± 109 36 ± 132 12 ± 29 57 ± 165
|ΔLKN|, median [IQR] 0 [0,0] 0 [0,0] 0 [0,0] 0 [0,0]
|ΔLKN| < 15 min, n (%) 229 (91%) 69 (80%) 27 (84%) 42 (78%)
Incorrectly included for IV tPA administration if EMS-reported LKN times were used, n (%) N/A 3 (6%)
Incorrectly excluded for IV tPA administration if EMS-reported LKN times were used, n (%) 0 (0%) N/A
*

|ΔLKN| = absolute difference in EMS-reported and neurologist-determined last known normal times

SD = Standard Deviation; [IQR] = [25th percentile, 75th percentile]