Table 2

Estimated trends* in the prevalence of cigarette smoking by type of cigarette and age, 2004–2014

Estimated slopes‡
Prevalence (%)†2004–20102010–2014Test for difference in slopes 2004–2010 vs 2010–2014
200420102014Slopep ValueSlopep Valuep Value
12–17 years
18–25 years
26+ years
  • *Time trends estimated using piecewise linear regression with one inflexion point at year 2010.

  • †Prevalence estimates are predicted from model.

  • ‡Slopes measure the percentage point change in prevalence per year. Bolded slopes indicate statistically significant change between 2004 and 2010 and 2010–2014 (p<0.05).