Table 3.

Combustible cigarette regression coefficients, standard errors, t statistics, and p values

	Coefficient	Standard error	t statistic	p value
Baseline
GBA
Level	− 1.260115	1.855424	− 0.68	0.498
Trend	− 0.2084171	0.1424893	− 1.46	0.146
USA
Level	− 7.223334	1.684262	− 4.29	0.000*
Trend	− 0.1965167	0.1554116	− 1.26	0.208
After EVALI
GBA
Level change	− 3.081916	1.843995	− 1.67	0.097
Trend change	0.2512693	0.2184791	1.15	0.252
USA
Level change	3.209894	1.221976	2.63	0.010*
Trend change	0.0570767	0.2734974	0.21	0.835
After mass ban
GBA
Level change	2.278667	1.824167	1.25	0.214
Trend change	− 0.0303285	0.2785707	− 0.11	0.913
USA
Level change	1.288095	0.874842	1.47	0.143
Trend change	0.6289722	0.3434625	1.83	0.069
After ban ended
GBA
Level change	− 1.300539	1.978937	− 0.66	0.512
Trend change	0.1918814	0.237574	0.81	0.421
USA
Level change	− 1.455614	1.241793	− 1.17	0.243
Trend change	− 0.3225095	0.4276565	− 0.75	0.452
After COVID-19
GBA
Level change	− 4.319313	4.899213	− 0.88	0.380
Trend change	0.4127087	0.6795817	0.61	0.545
USA
Level change	− 11.23393	3.299207	− 3.41	0.001*
Trend change	0.7737937	0.4751412	1.63	0.106
After tax
GBA
Level change	− 13.61722	3.55943	− 3.83	0.000*
Trend change	− 0.4348779	0.687841	− 0.63	0.528
USA
Level change	− 0.5232736	1.81891	− 0.29	0.774
Trend change	− 1.124816	0.4704655	− 2.39	0.018*

Regression coefficients for the level and trend changes in cigarette purchasing in the Greater Boston area and the USA at the baseline and after the four intervention points, along with the standard error, t statistics, and p values corresponding to each value. Asterisks (*) indicate significance at p < 0.05