Table 3.

Parameter estimates of the selected ARIMA models for weekly COVID-mention among help-seekers in Open Up (Open Up, CMD, and No CMD)

Weekly	ARIMA model	Parameter	Estimate	Standard error	p	AIC	SBC
Open Upa	AR(1,0,0)	MUb	−6.34	12.77	0.620	526	532
		AR1c	0.77	0.09	<0.001
		COVIDd	0.08	0.03	0.002
	AR(1,0,0)	MU	−4.41	9.79	0.652	520	528
		AR1	0.71	0.10	<0.001
		ImpF-2e	34.87	17.14	0.042
		MagI-3f	0.14	0.03	<0.001
CMDg	AR(1,0,0)	MU	−4.68	10.03	0.641	497	503
		AR1	0.77	0.09	<0.001
		COVID	0.06	0.02	0.003
	AR(1,0,0)	MU	−3.20	7.67	0.676	492	500
		AR1	0.71	0.09	<0.001
		ImpF-2	26.53	13.41	0.048
		MagI-3	0.10	0.03	<0.001
No CMDh	AR(1,0,0)	MU	−0.78	2.35	0.740	395	401
		AR1	0.59	0.11	<0.001
		COVID	0.02	0.01	0.004
	AR(1,0,0)	MU	−0.61	2.04	0.763	391	397
		AR1	0.54	0.12	<0.001
		MagI-3	0.04	0.01	<0.001

^aSelected ARIMA model for COVID-mention.

^bIntercept.

^cAutoregressive, lagged by one day.

^dCOVID-19 reported cases in Hong Kong.

^eImpulse function for the 2nd wave: the value of 1 for the 2nd wave of COVID-19.

^fMagnitude effect for the 3rd wave: COVID-19 magnitude in the 3rd wave of outbreak.

^gSelected ARIMA model for the CMD-mention subgroup.

^hSelected ARIMA model for non-CMD mention subgroup.