Table 3.

Autoregressive integrated moving average (ARIMA) time series analyses results predicting the count of weekly emergency department visits among Hispanic and Black patients, separately, at LAC + USC Medical Center during the early and later COVID-19 pandemic lockdown periods, January 5, 2018, to December 31, 2020

Parameter	Hispanic patients
	Early pandemic period March 13, 2020–May 7, 2020			Later pandemic period May 8, 2020–July 2, 2020
	Coefficient	Standard Error	p-value	Coefficient	Standard Error	p-value
Period of interest	− 61.10	16.802	< .001	− 38.76	18.403	< .05
AR (1)	0.46	0.081	< .001	0.70	0.059	< .001
AR (3)	0.23	0.086	< .01
AR (5)	0.20	0.087	< .05
Percent change	22.8%			14.6%

	Black patients
	Early pandemic period March 13, 2020–May 7, 2020			Later pandemic period May 8, 2020–July 2, 2020
	Coefficient	Standard error	p-value	Coefficient	Standard error	p-value
Period of interest	− 10.72	3.309	< .01	− 1.67	3.742	.653
AR (3)	0.28	0.075	< .001	0.27	0.075	< .001
AR (4)	0.30	0.075	< .001	0.31	0.076	< .001
MA (2)				− 0.19	0.084	< .05
Percent change	26.1%			4.1%