Table 1

Interrupted time series regression results for the 2009 flavour ban in Canada

All cigars, B (95% CI)
n=48
No flavour descriptor, B (95% CI)
n=48
Flavour descriptor, B (95% CI)
n=48
Initial level (2004 first quarter) β 0 45.7 (37.3 to 54.2)**44.9 (39.9 to 50.0)**0.8 (−9.3 to 11.0)
Preintervention slope β 1 Tt 4.9 (4.3 to 5.5)**−0.8 (−1.4 to −0.3)*5.7 (5.0 to 6.5)**
Postintervention level
Change (2010 first quarter) β 2 Xt
−49.6 (−73.5 to −25.8)**9.6 (−1.3 to 20.5)−59.2 (−86.0 to −32.4)**
Postintervention
Change in trend β 3 XtTt
−6.9 (−8.1 to −5.7)**0.8 (0.2 to 1.3)*−7.7 (−8.9 to −6.5)**
  • Outcome wholesale volume sales of cigars (millions of units) per quarter, total, and by brands with or without flavour descriptors. n=48.

  • Flavour descriptor as identified by brand descriptor.

  • Enactment date of regulation: 8 October 2009.

  • All analyses control for seasonality by quarter.

  • *P<0.05, **p<0.001.