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Table 2 E-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 4.140104 3.051848 1.36 0.177 − 1.898052 10.17826
 USA 95.65063 3.482517 27.47 0.000* 88.76039 102.5409
EVALI
 GBA − 3.6925 0.6550 − 5.6369 0.0000* − 4.9885 − 2.3964
 USA − 3.0662 0.8282 − 3.7021 0.0003* − 4.7049 − 1.4275
 Difference − 0.6263 0.6432 − 0.9737 0.3320 − 1.8988 0.6463
MA ban
 GBA − 2.2510 0.7901 − 2.8490 0.0051* − 3.8142 − 0.6878
 USA − 0.4350 0.7573 − 0.5745 0.5667 − 1.9334 1.0633
 Difference − 1.8159 0.6195 − 2.9312 0.0040* − 3.0417 − 0.5902
After ban ended
 GBA 0.5744 0.6246 0.9196 0.3595 − 0.6614 1.8102
 USA − 0.4180 0.5692 − 0.7343 0.4641 − 1.5442 0.7082
 Difference 0.9924 0.2911 3.4086 0.0009* 0.4164 1.5684
COVID-19
 GBA − 0.5267 0.5933 − 0.8877 0.3763 − 1.7005 0.6471
 USA − 0.7272 0.6887 − 1.0559 0.2930 − 2.0899 0.6355
 Difference 0.2006 0.6068 0.3305 0.7415 − 0.9999 1.4010
MA tax
 GBA − 0.9344 0.4942 − 1.8907 0.0609 − 1.9122 0.0434
 USA − 2.1260 0.5320 − 3.9965 0.0001* − 3.1785 − 1.0735
 Difference 1.1916 0.4405 2.7051 0.0078* 0.3201 2.0631
  1. The post-trend regression coefficients for e-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