Table 4.

Combustible cigarette post-trend estimated coefficients, standard errors, t values, p values, and confidence intervals

	Coefficient	Standard error	t value	p value	95% confidence interval
Baseline
GBA	− 1.26012	1.855424	− 0.68	0.498	− 4.93112	2.410887
USA	− 7.22333	1.684262	− 4.29	0.000*	− 10.5557	− 3.89098
EVALI
GBA	− 0.0966	0.2429	− 0.3977	0.6915	− 0.5771	0.3839
USA	− 0.1394	0.1756	− 0.7940	0.4287	− 0.4869	0.2080
Difference	0.0429	0.1537	0.2789	0.7808	− 0.2612	0.3469
MA ban
GBA	0.5021	0.3471	1.4463	0.1505	− 0.1848	1.1889
USA	0.4895	0.2764	1.7709	0.0789	− 0.0574	1.0365
Difference	0.0125	0.2311	0.0542	0.9569	− 0.4448	0.4698
After ban ended
GBA	0.3714	0.2163	1.7175	0.0883	− 0.0564	0.7993
USA	0.1670	0.2188	0.7635	0.4466	− 0.2658	0.5998
Difference	0.2044	0.0991	2.0629	0.0411*	0.0084	0.4004
COVID-19
GBA	1.5579	0.6017	2.5891	0.0107*	0.3674	2.7485
USA	0.9408	0.4394	2.1414	0.0341*	0.0715	1.8101
Difference	0.6171	0.6770	0.9116	0.3637	− 0.7223	1.9565
MA tax
GBA	− 0.0018	0.1805	− 0.0098	0.9922	− 0.3589	0.3554
USA	− 0.1840	0.1669	− 1.1023	0.2724	− 0.5143	0.1463
Difference	0.1822	0.1300	1.4018	0.1634	− 0.0750	0.4394

The post-trend regression coefficients for cigarette purchasing in the Greater Boston area and the USA at baseline and after the four intervention points, the difference between the coefficients of the two groups, along with the standard error, t value, p statistic, and 95% confidence interval for each value. Asterisks (*) indicate significance at p < 0.05