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Table 4 Relation between patients socio-demographic characteristics* and time-delay, and means, standard errors and p-values of differences for the statistical significant relations

From: Quality of care of patients with acute myocardial infarction in Bulgaria: a cross-sectional study

Variables df** Chi-square value Exact probability
Gender 4 0.76 0.9601
Age 4 9.67 0.0348***
Education level 12 56.29 0.0029***
Personal monthly income 16 16.04 0.4503
Time delay (in hours)
  Mean Standard error of mean p-value for difference
Age    
   ≤ 64 5.83 0.71 0.005***
   ≥ 65 3.47 0.37
Education level    
   low 3.67 0.44 0.024***
   high 5.45 0.64
  1. * Patients with pain-to-door time > 24 h and patients transferred from other hospitals are excluded
  2. ** df – degree of freedom
  3. *** the relation is statistically significant