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Table 2 Comparison of pretest probability estimates for acute coronary syndrome using two techniques in a validation population.

From: Pretest probability assessment derived from attribute matching

  Category of Pretest Probability
  Very Low (<2%) Low (2 to <10%) Moderate (10 to 30%) High (>30%) Indeterminate*
Attribute Matching
Number with ACS† 28 189 250 9 125
Total in category‡ 1670 2953 1453 28 955
Prevalence of ACS 1.7% 6.4% 17.2% 32.1% 13.1%
% of all patients assessed 23.7% 41.8% 20.6% 0.4% 13.5%
Logistic Regression
Number with ACS† 4 59 272 266 NA
Total in category‡ 244 1356 3813 1646 NA
Prevalence of ACS 1.6% 4.4% 7.1% 16.2% NA
% of all patients assessed 3.5% 19.2% 54.0% 23.3% NA
  1. *Estimates from attribute matching with match size <50. Does not apply to logistic regression.
  2. †Total number of patients with ACS = 601
  3. ‡Total number patients in validation study = 7059
  4. Abbreviations: ACS acute coronary syndrome.