Table 3. The effects of COVID-19 pandemic on the time intervals of the Door-to-Device procedure were examined using multivariate regression analysis, with adjustment for potential confounders.

Variables	1. Door-to-ECG		2. ECG-to-CCLA		3. CCLA-to-CCLD		4.2. Angio-to-Device
	Betaa	pa	Betab	pb	Betaa	pa	Betab	pb
COVID-19 periods
Period-I	Ref	-	Ref	-	Ref	-	Ref	-
Period-II	0.10	0.601	-0.11	0.914	-0.02	0.988	-2.60	< 0.001*
Period-III	0.62	0.006*	3.30	0.009*	9.65	< 0.001*	-4.08	< 0.001*
Sex, male to female	-0.68	0.013*	-0.42	0.743	-1.80	0.292	0.70	0.307
CAD history	-0.56	0.042*	-1.39	0.319	-0.41	0.845	-0.43	0.616
Triage level, from 4 to 1	-0.28	0.072	-2.41	< 0.001*	1.88	0.05	-0.46	0.267

GLM Tweedie^a or Gamma^b regression was appropriately employed based on the goodness-of-fit test for non-normally distributed independent variables.

CAD, coronary artery disease; CCLA, cardiac catheterization laboratory activation; CCLD, cardiac catheterization laboratory door; COVID-19, Coronavirus Disease 2019; ECG, electrocardiogram; ICU, intensive care unit.