Table 3

Multivariable logistic regression of factors associated with system time intervals

EMS delay time >60 minDTB time >60 min
aOR (95% CI)P valueaOR (95% CI)P value
Demographic
 Age, per 10 years1.11 (1.04 to 1.18)0.0011.17 (1.09 to 1.25)<0.001
 Female sex1.43 (1.17 to 1.74)<0.0011.06 (0.86 to 1.31)0.6
Comorbidities
 Previous revascularisation0.93 (0.74 to 1.16)0.51.11 (0.87 to 1.40)0.4
 Diabetes0.94 (0.76 to 1.17)0.61.30 (1.04 to 1.63)0.022
 Peripheral vascular disease1.31 (0.73 to 2.35)0.40.53 (0.29 to 0.97)0.039
 Cerebrovascular disease1.25 (0.82 to 1.93)0.31.17 (0.74 to 1.85)0.5
 Chronic oral anti-coagulant therapy1.08 (0.66 to 1.77)0.81.54 (0.92 to 2.58)0.1
Clinical characteristics
 Cardiogenic shock1.91 (1.44 to 2.54)<0.0012.4 (1.81 to 3.19)<0.001
 OHCA4.21 (3.13 to 5.67)<0.0011.00 (0.76 to 1.32)1
 Anterior infarction1.12 (0.96 to 1.31)0.21.36 (1.15 to 1.6)<0.001
System factors
 Prehospital 12-lead ECG
 Not takenReferenceReference
 Taken and not transmitted1.67 (1.33 to 2.10)<0.0011.08 (0.85 to 1.36)0.5
 Taken and transmitted1.68 (1.36 to 2.08)<0.0010.39 (0.31 to 0.49)<0.001
 MICA on scene1.68 (1.36 to 2.07)<0.0010.45 (0.36 to 0.56)<0.001
 Time of call (off-hours)1.06 (0.91 to 1.24)0.52.56 (2.18 to 3.01)<0.001
 Day of call (weekends)0.95 (0.80 to 1.12)0.51.97 (1.65 to 2.36)<0.001
Time delays
 Patient delay time >30 min1.11 (0.95 to 1.30)0.180.94 (0.80 to 1.11)0.4
 EMS delay time >60 min--0.80 (0.68 to 0.95)0.01
  • aOR, adjusted OR; DTB, door-to-balloon; EMS, emergency medical service; MICA, mobile intensive care ambulance; OHCA, out-of-hospital cardiac arrest.