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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