Table 1.
Interrupted Time-Series Regression Results for the 2017 Menthol Ban in Canada. Outcome Wholesale Sales of Cigarettes (Millions of Units) per Month, Total and by Brands With or Without Menthol Descriptors. Sales Levels Centered on October 2012 Baseline. N = 160
| All cigarettes β (95% CI) | Nonmenthol cigarettes β (95% CI) | Menthol cigarettes β (95% CI) | |
|---|---|---|---|
| BC initial level (2012 October) β0 | −32 (−65.7 to 1.8) | −24.6 (−57.3 to 8.0) | −7.9 (−15.9 to 0.1) |
| BC pre Intervention trend β1Tt | −0.5 (−1.3 to 0.3) | −0.9* (−1.7 to −0.1) | 0.4* (0.1 to 0.7) |
| ON difference in baseline level vs. BC | −15.9 (−63.8 to 31.9) | −14.6 (−58.8 to 29.6) | −0.1 (−11.2 to 10.9) |
| ON difference in baseline trend vs. BC | −1.0 (−2.5 to 0.4) | −1.1 (−2.5 to 0.3) | 0 (−0.5 to 0.6) |
| BC post-intervention level change β2Xt | 17.9 (−35.2 to 71.0) | 7.5 (−49.8 to 64.7) | 10.5 (−4.4 to 25.3) |
| BC post-intervention change in trend β3XtTt | −4.3 (−14.0 to 5.3) | −2.8 (−13.1 to 7.5) | −1.6 (−4.0 to 0.8) |
| ON difference in post-intervention level vs. BC | −127.8** (−208.2 to −47.4) | −72.8 (−155.6 to 10.0) | −55.0*** (−78.5 to −31.5) |
| ON difference in post-intervention change in trend vs. BC | 23.0*** (10.3 to 35.6) | 23.8*** (10.2 to 37.4) | −0.8 (−2.9 to 1.3) |
BC = British Columbia, ON = Ontario. Implementation date of regulation: January 1, 2017. All analyses control for seasonality by month.
*p < .05,**p < .01,***p < 0.001.