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Multiple logistic regression model based on ECG and other clinical characteristics of patients (n = 627a) who come to the emergency department with acute chest pain and acute coronary syndrome (ACS). I-STamp, ST amplitude in lead I; aVF-STamp, ST amplitude in lead aVF; V2-STamp, ST amplitude in lead V2; STamp38, ST amplitude at the end of the third out of eight equal intervals between the ST-J point and the end of the T wave. |
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| Estimate |
95% CI |
|
|
|
||
| Baseline odds for ACSb |
0.0163 |
0.0073 – 0.0362 |
| Odds ratios |
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| Age (no. of years above 40) |
1.031 |
1.014 – 1.047 |
| Hypertension |
1.7 |
1.1 – 2.8 |
| Angina pectoris ≤ 1 month |
4.1 |
0.97 – 17 |
| Congestive heart failure |
0.48 |
0.24 – 0.94 |
| Previous myocardial infarction |
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| Yes, ≤ 6 months |
2.7 |
1.2 – 6.4 |
| Yes, > 6 months |
2.1 |
1.2 – 3.8 |
| No |
1.0 |
- |
| Previous CABG |
0.23 |
0.09 – 0.60 |
| Chest discomfort at presentation |
1.9 |
1.2 – 3.1 |
| Symptom duration |
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| 0 – 6 h |
3.8 |
2.0 – 7.1 |
| 7 – 12 h |
2.8 |
1.2 – 6.5 |
| > 12 h |
1.0 |
- |
| I-Stamp |
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| I-STamp > 50 and I-STamp38 > I-Stamp |
2.4 |
0.74 – 7.7 |
| aVF-Stamp |
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| aVF-STamp>100 and aVF-STamp38>aVF-Stamp |
9.4 |
2.7 – 33 |
| aVF-STamp < -100 and aVF-STamp38 < aVF-STamp |
4.1 |
0.72 – 23 |
| None of above |
1.0 |
|
| V2-Stamp |
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| V2-STamp > 200 and V2-STamp38 > V2-Stamp |
3.4 |
1.5 – 7.4 |
| 100 < V2-STamp ≤ 200 and V2-STamp38 > V2-STamp |
1.6 |
0.90 – 2.8 |
| V2-STamp < -100 and V2-STamp38 < V2-Stamp |
2.6 |
0.54 – 13 |
| None of above |
1.0 |
- |
|
a Data on at least one of characteristics were missing for 7 (4 with ACS and 3 without ACS) of the original 634 patients. b Baseline odds for ACS for a 40-year old patient who belongs to the reference category with respect to all other characteristics. The corresponding risk (probability) for ACS can be calculated as Odds/(1+Odds). | ||
Björk et al. BMC Medical Informatics and Decision Making 2006 6:28 doi:10.1186/1472-6947-6-28 |
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