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Table 1 Baseline characteristics of the study cohort across Door-in to door-out (DIDO) status, Ontario, Canada, 2012

From: Factors associated with door-in to door-out delays among ST-segment elevation myocardial infarction (STEMI) patients transferred for primary percutaneous coronary intervention: a population-based cohort study in Ontario, Canada

 

DIDO time (mins)

aOR (95% CI)a

(timely DIDO vs. untimely)b

≤30 min

> 30 min

(N = 194)

(N = 772)

 

Frequency (column %)

 

Age group, years

 18–55

87 (44.8)

230 (29.8)

Ref.

 56–65

51 (26.3)

234 (30.3)

0.57 (0.39–0.87)

 66–75

36 (18.6)

154 (19.9)

0.61 (0.37–0.99)

 > 75

20 (10.3)

154 (19.9)

0.30 (0.16–0.56)

Sex, females

33 (17.0)

194 (25.1)

0.72 (0.46–1.15)

Cardiovascular risk factors

 Diabetes mellitus

39 (20.1)

167 (21.6)

0.95 (0.62–1.45)

 Current smoker

88 (45.4)

302 (39.1)

0.96 (0.67–1.39)

 Hypertension

93 (47.9)

390 (50.5)

0.98 (0.68–1.41)

Previous cardiovascular clinical events

 Myocardial infarction

21 (10.8)

99 (12.8)

0.68 (0.70–3.03)

 Angina

8 (4.1)

41 (5.3)

0.93 (0.39–2.22)

 COPD

7 (3.6)

38 (4.9)

0.94 (0.38–2.33)

 Stroke

7 (3.6)

30 (3.9)

1.43 (0.58–3.57)

Presenting characteristics

 Cardiac arrest at scene

13 (6.7)

51 (6.6)

0.69 (0.71–2.04)

 Elevated cardiac enzymesc

171 (88.1)

675 (87.4)

1.22 (0.71–2.04)

 Off-hours presentationd

122 (62.9)

508 (65.8)

0.91 (0.64–1.28)

Symptom to FMC time, mins

 0–60

84 (43.3)

212 (27.5)

Ref.

 61–120

56 (28.9)

268 (34.7)

0.60 (0.39–0.90)

 > 120

54 (27.8)

292 (37.8)

0.53 (0.35–0.81)

Transport to first hospital

 Self-transport

103 (53.1)

510 (66.1)

Ref.

 EMS transport with ECG

36 (18.6)

71 (9.2)

2.63 (1.59–4.35)

 EMS transport without ECG

55 (28.4)

191 (24.7)

1.45 (0.95–2.22)

  1. Abbreviations: aOR adjusted odds ratio, CI confidence interval, COPD chronic obstructive pulmonary disease, DIDO door-in to door-out, ECG electrocardiogram, EMS emergency medical services, FMC first medical contact, mins minutes, Ref reference
  2. aLogistic regression model fully adjusted for all the variables in the table
  3. bDoor-in to door-out times were considered timely if they were ≤ 30 min
  4. cElevated cardiac enzyme levels were defined as having at least one of the following occur within the first 24 h of the first medical contact: 1) a rise in troponin levels above the upper reference limit or the level indicative of acute myocardial infarction, or 2) a rise in creatine kinase MB or creatine kinase more than twice the upper limit of normal as defined on the lab report
  5. dDefined as presentation to a hospital before 9 am or after 5 pm on weekdays and anytime on weekends