Estimated slopes‡ | ||||||||
---|---|---|---|---|---|---|---|---|

Prevalence (%)† | 2004–2010 | 2010–2014 | Test for difference in slopes 2004–2010 vs 2010–2014 | |||||

2004 | 2010 | 2014 | Slope | p Value | Slope | p Value | p Value | |

12–17 years | ||||||||

Menthol | 4.6 | 4.3 | 2.5 | −0.04 | 0.28 | −0.46 | <0.01 | <0.01 |

Non-menthol | 6.3 | 3.5 | 2.2 | −0.46 | <0.01 | −0.33 | <0.01 | 0.13 |

18–25 years | ||||||||

Menthol | 12.9 | 15.7 | 14.8 | 0.47 | <0.01 | −0.23 | 0.13 | <0.01 |

Non-menthol | 26.9 | 18.0 | 14.0 | −1.48 | <0.01 | −1.01 | <0.01 | <0.05 |

26+ years | ||||||||

Menthol | 7.1 | 7.3 | 7.8 | 0.04 | 0.28 | 0.11 | <0.05 | 0.34 |

Non-menthol | 17.4 | 15.4 | 13.4 | −0.33 | <0.01 | −0.50 | <0.01 | 0.26 |

*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).