Table 2

Adjusted association between study variables and 30-day mortality rate

Total populationWithout haemodynamic complications
Adjusted OR (95% CI) n=2976P valueAdjusted OR (95% CI) n=2426P value
Demographic
 Age, per 10 years1.70 (1.47 to 1.96)<0.0012.35 (1.79 to 3.08)<0.001
 Female sex1.89 (1.28 to 2.79)0.0012.34 (1.33 to 4.12)0.004
Comorbidities
 Previous revascularisation1.46 (0.93 to 2.28)0.11.60 (0.82 to 3.14)0.17
 Diabetes1.60 (1.05 to 2.43)0.031.92 (1.04 to 3.55)0.036
 Peripheral vascular disease1.61 (0.63 to 4.1)0.34.09 (1.30 to 12.88)0.016
 Cerebrovascular disease1.36 (0.65 to 2.72)0.41.22 (0.44 to 3.40)0.7
 Chronic oral anti-coagulant therapy1.81 (0.88 to 3.72)0.113.19 (1.31 to 7.74)0.01
Clinical characteristics
 Cardiogenic shock10.68 (7.47 to 15.28)<0.001--
 OHCA4.54 (2.96 to 6.96)<0.001--
 Anterior infarction1.46 (1.05 to 2.04)0.0251.5 (0.87 to 2.57)0.14
System factors
 Prehospital 12-lead ECG
 Not takenReferenceReference
 Taken and not transmitted0.61 (0.39 to 0.95)0.030.75 (0.36 to 1.54)0.4
 Taken and transmitted0.53 (0.35 to 0.81)0.0040.48 (0.24 to 1.00)0.049
 MICA on scene1.47 (0.89 to 2.42)0.131.86 (0.92 to 3.77)0.09
Increase in system time intervals
 Patient delay time, per 30 min1.00 (0.95 to 1.05)0.90.92 (0.84 to 1.01)0.1
 EMS delay time, per 30 min1.20 (1.02 to 1.40)0.0250.95 (0.67 to 1.35)0.8
 DTB time, per 30 min1.04 (0.96 to 1.13)0.31.02 (0.86 to 1.18)0.8
  • The interaction term between patient delay >30 min and EMS delay time was significant in the total population (adjusted OR 0.81; 95% CI 0.70 to 0.92; p=0.001).

  • DTB, door-to-balloon; EMS, emergency medical service; MICA, mobile intensive care ambulance; OHCA, out-of-hospital cardiac arrest.