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Table 4 Odds ratios for ACS for two hypothetical patients, A and B, used as examples. Patient A is female, 72 years old, and seeks emergency care with ongoing chest discomfort that has lasted for 7 hours. She has undergone CABG previously and has had angina pectoris in connection with physical effort the last month. The ECG shows an elevation of the ST-amplitude above 200 in lead V2 only. Patient B is male, 35-year old, and with chest discomfort for the last 72 hours but without any ST-elevations according to the ECG.

From: A simple statistical model for prediction of acute coronary syndrome in chest pain patients in the emergency department

  Model Estimate Patient A OR Patient B OR
Baseline odds for ACS 0.0163   0.00163   0.00163
Odds ratios      
   Age (no. of years above 40) 1.031 72 1.03132 35 1.031-5
   Hypertension 1.7 No 1.0 No 1.0
   Angina pectoris ≤ 1 month 4.1 Yes 4.1 No 1.0
   Congestive heart failure 0.48 No 1.0 No 1.0
   Previous myocardial infarction   No 1.0 No 1.0
Yes, ≤ 6 months 2.7     
Yes, > 6 months 2.1     
No 1.0     
   Previous CABG 0.23 Yes 0.23 No 1.0
   Chest discomfort at presentation 1.9 Yes 1.9 Yes 1.9
   Symptom duration   7 hours 2.8 72 hours 1.0
0 – 6 h 3.8     
7 – 12 h 2.8     
> 12 h 1.0 -    
   I-STamp   No 1.0 No 1.0
I-STamp > 50 and I-STamp38 > I-STamp 2.4     
   aVF-STamp   No 1.0 No 1.0
aVF-STamp>100 and aVF-STamp38>aVF-STamp 9.4     
aVF-STamp < -100 and aVF-STamp38 < aVF-STamp 4.1     
None of above 1.0     
   V2-STamp   > 200 3.4 No 1.0
V2-STamp > 200 and V2-STamp38 > V2-Stamp 3.4     
100 < V2-STamp ≤ 200 and V2-STamp38 > V2-STamp 1.6     
V2-STamp < -100 and V2-STamp38 < V2-STamp 2.6     
None of above 1.0 -