Table 2  Predictors of short total pre-hospital delays
Delay ≤ 120 min (%)  Delay > 120 min (%)  p-value (χ2)  Odds ratioa  95% Confidence interval  p-value
Sociodemographic factors
Marital status
 Not married  29.7  41.9  0.056  1
 Married  70.3  58.1   1.77  (1.01 to 3.11)  0.048



Clinical factors
Type of acute coronary syndrome
 UAb/NSTEMIc  22.5  35.9  0.027  1  (1.03 to 3.90)  0.028
 STEMId  77.5  64.1   1.93
Number of pain symptoms: (in addition to chest pain)
 None  11.7  18.8  0.005  1
 1–3  49.5  61.5   1.34  (0.62 to 2.93)  0.460
 4–8  38.7  19.7   3.03  (1.39 to 7.86)  0.007
Number of non-pain symptoms
 None  15.3  25.6  0.001  1
 1–2  41.4  53.0   1.33  (0.65 to 2.73)  0.429
 3–6  43.2  21.4   3.49  (1.60 to 7.58)  0.002



Cardiac risk factors
Previous myocardial infarction
 No  83.8  93.1  0.028  1
 Yes  16.2  6.9   2.80  (1.15 to 6.82)  0.023



Attribution
Symptoms attributed to heart attack
 No  68.2  80.3  0.036  1
 Yes  31.8  19.7   1.90  (1.03 to 3.49)  0.039



Proximal factors
Location at onset
 Home  55.9  73.3  0.006  1
 Other  44.1  26.7   2.23  (1.25 to 3.95)  0.006
Presence of a bystander
 Absent  35.5  55.6  0.006  1
 Present  64.5  44.4   2.26  (1.26 to 4.15)  0.006
Time of onset
 0001–1200  44.1  62.4  0.006  1
 1201–2400  55.9  37.6   2.08  (1.23 to 3.54)  0.007
a  Adjusted for age and gender.
b  Unstable angina.
c  Non Non-ST elevation myocardial infarction.
d  ST elevation myocardial infarction.