From: Effect of Massachusetts House Bill No. 4196 on electronic cigarette use: a mixed-methods study
 | 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 |