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Table 3 Incidence and annual event rate of outcomes during follow-up

From: Long-term outcome of vertebral artery origin stenosis in patients with acute ischemic stroke

  Incidence, number of patients (%) Annual event rate, per 100 patient-years units (95% CI) P-value*
  Total (n = 137) Asymptomatic (n = 64) Symptomatic (n = 73) Total (n = 137) Asymptomatic (n = 64) Symptomatic (n = 73)
All stroke 15 (10.9) 9 (14.1) 6 (8.2) 4.86 (2.93–8.06) 6.02 (3.13–11.58) 3.77 (1.69–8.38) 0.367
  Posterior circulation ischemic stroke 3 (2.2) 0 (0) 3 (4.1) 0.97 (0.31–3.01) 0.00 1.88 (0.61–5.84) 0.046
  Anterior circulation ischemic stroke 4 (2.9) 3 (4.7) 1 (1.4) 1.30 (0.49–3.45) 2.01 (0.65–6.23) 0.63 (0.09–4.45) 0.277
  Hemorrhagic stroke 6 (4.4) 4 (6.3) 2 (2.7) 1.94 (0.87–4.33) 2.68 (1.00–7.13) 1.26 (0.31–5.02) 0.367
  Unknown stroke 2 (1.5) 2 (3.1) 0 (0) 0.65 (0.16–2.59) 1.34 (0.33–5.35) 0.00 0.088
Unstable angina/myocardial infarction 4 (2.9) 2 (3.1) 2 (2.7) 1.30 (0.49–3.45) 1.34 (0.33–5.35) 1.26 (0.31–5.02) 0.949
Vascular death 4 (2.9) 2 (3.1) 2 (2.7) 1.30 (0.49–3.45) 1.34 (0.33–5.35) 1.26 (0.31–5.02) 0.949
Composite cardiovascular outcome 21 (15.3) 11 (17.2) 10 (13.7) 6.80 (4.43–10.43) 7.36 (4.08–13.30) 6.28 (3.38–11.66) 0.714
Non–vascular death 14 (10.2) 8 (12.5) 6 (8.2) 4.53 (2.69–7.66) 5.36 (2.68–10.71) 3.77 (1.69–8.38) 0.512
  1. *p-value was calculated from annual event rates of the asymptomatic and symptomatic groups.