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Table 4 Combustible cigarette post-trend estimated coefficients, standard errors, t values, p values, and confidence intervals

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
  1. 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