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Table 3 Generalized linear regression analysis of covariates associated with mortality. Analyzed at 30 days and 4 years in patients suspected of myocardial infarction triaged by use of electrocardiogram-based telemedicine (n = 15,578 cases with complete data)

From: Dyspnea, a high-risk symptom in patients suspected of myocardial infarction in the ambulance? A population-based follow-up study

 

30-day mortality

4-year mortality

Covariates remaining significant in models

    

Risk difference (95 % CI)

P value

Risk difference (95 % CI)

P value

Demographics

    

  Age, per 1-y increase

0.19 % (0.17 to 0.21)

<0.001

0.9 % (0.8 to 1.0))

<0.001

Comorbidity

    

Charlson Comorbidity Index

    

 0

1 [Reference]

 

1 [Reference]

 

 1–2

0.1 % (−0.6 to 0.8)

0.852

7.2 % (5.4 to 8.9)

<0.001

 3–4

1.6 % (0.3 to 2.8)

0.017

22 % (19 to 26)

<0.001

 ≥5

6.4 % (4.3 to 8.6)

<0.001

39 % (35 to 44)

<0.001

Clinical characteristics

    

Systolic blood pressure

    

 <120

1 [Reference]

 

1 [Reference]

 

 120–139

−4.9 % (−6.2 to −3.6)

<0.001

−3.7 % (−6.2 to −1.2)

0.004

 140–159

−6.0 % (−7.3 to −4.8)

<0.001

−7.3 % (−9.9 to −4.8)

<0.001

 ≥160

−7.8 % (−9.1 to −6.5)

<0.001

−11 % (−13 to −8.0)

<0.001

Heart rate

    

 <70

1 [Reference]

 

1 [Reference]

 

 70–84

1.3 % (0.5 to 2.1)

0.001

4.1 % (2.0 to 6.3)

<0.001

 85–99

2.2 % (1.3 to 3.1)

<0.001

5.2 % (2.9 to 7.5)

<0.001

 ≥100

3.2 % (2.2 to 4.1)

<0.001

8.7 % (6.5 to 10.9)

<0.001

Patient category

    

 Chest pain, no MI

1 [Reference]

 

1 [Reference]

 

 Chest pain and MI

1.8 % (0.8 to 2.8)

<0.001

1.7 % (−0.7 to 4.0)

0.167

 Dyspnea, no MI

7.3 % (5.5 to 9.2)

<0.001

16 % (12 to 19)

<0.001

 Dyspnea and MI

12 % (5.7 to 20)

<0.001

21 % (11 to 32)

<0.001

 Other

1.7 % (0.8 to 2.6)

<0.001

3.8 % (1.7 to 5.8)

<0.001

 Cardiac arrest

26 % (18 to 34)

<0.001

20 % (11 to 29)

<0.001

  1. Abbreviations: MI myocardial infarction