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Table 3 Prevalence of events for each level of risk.

From: Ruling out coronary heart disease in primary care patients with chest pain: a clinical prediction score

Events Low-risk CHD
Score = 0-4
n= 413
Intermediate-risk
CHD Score = 5-7
n= 161
High-risk
CHD Score = 8-11
n= 87
  n % (CI 95%) n % (CI 95%) n % (CI 95%)
Coronary Heart Disease          
   Observed 2 0.5% (0.0 to 1.7) 20 12.4% (7.8 to 18.5) 63 72.4% (61.8 to 81.5)
   Prevalence from bootstrapping* 0.7 (0.6) 14.6 (10) 69.4 (16)
   Validation cohort (N = 774) † 15/289 5.2% (3.0 to 8.4) 40/327 12.2% (8.9 to 16.3) 59/158 37.3% (29.8 to 45.4)
Acute myocardial infarction 1 0.2% (0 to1.3) 1 0.6% (0 to 3.4) 2 2.3% (0.3 to 8.1)
Unstable angina 0 0% (0 to 0.9) 2 1.2% (0.2 to 4.4) 4 4.6% (1.3 to 11.4)
Deaths          
   Overall 4 1.0% (0.3 to 2.5) 11 6.8% (3.5 to 11.9) 9 10.3% (4.8 to 18.7)
   CVD 0 0% (0 to 0.9) 2 1.2% (0.2 to 4.4) 9 10.3% (4.8 to 8.7)
   CHD 0 0% (0 to 0.9) 2 1.2% (0.2 to 4.4) 7 8.0% (3.3 to 15.9)
  1. Mean and SD of predicted values according to the risk category (bootstrapping).
  2. * Mean prevalence in each risk category (with SD) given by the 300 bootstrap rules (%)
  3. † Data drawn from the German cohort (Marburg study)
  4. CHD = coronary heart disease; CVD = cardio-vascular disease
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