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

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

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	0.005***
Education level
low	3.67	0.44	0.024***
high	5.45	0.64	0.024***

* Patients with pain-to-door time > 24 h and patients transferred from other hospitals are excluded
** df – degree of freedom
*** the relation is statistically significant

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