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Table 2 Number and risk of ipsilateral ischemic strokes on days 7 and 90 after the presenting event, according to the number of additional events

From: Recurrent stroke risk is high after a single cerebrovascular event in patients with symptomatic 50-99% carotid stenosis: a cohort study

  Patients 7 days 90 days p-value
Strokes Risk Strokes Risk
  n (%) n (%*) % (95%CI) n (%*) % (95%CI)  
Clinically stable 155 (67) 12 (67) 8% (4–12) 22 (67) 18% (10–25) p = 0.47†
Clinically unstable 47 (20) 4 (22) 9% (1–17) 9 (27) 24% (10–39)
Clinically highly unstable 28 (12) 2 (11) 7% (0–17) 2 (6) 7% (0–17)
0 events 7 days before the presenting event 183 (80) 14 (78) 8% (4–12) 24 (73) 17% (10–24) p = 0.14†
1 event 7 days before the presenting event 32 (14) 3 (17) 10% (0–20) 8 (24) 35% (13–57)
≥2 events 7 days before the presenting event 15 (7) 1 (6) 7% (0–19) 1 (3) 7% (0–19)
0 events 7 days after‡ the presenting event 188 (82) 15 (83) 8% (4–12) 30 (91) 20% (13–28) p = 0.33†
1 event 7 days after‡ the presenting event 27 (12) 1 (6) 4% (0–11) 1 (3) 4% (0–11)
≥2 events 7 days after‡ the presenting event 15 (7) 2 (11) 13% (0–31) 2 (6) 13% (0–31)  
  1. * Percent of all strokes. † Log rank test. ‡ Events after the presenting event: Only additional TIA or amaurosis fugax that occurred before CEA and before recurrent ipsilateral ischemic stroke were analyzed.
  2. Risk figures derived from Kaplan-Meier analyses.