First policy modification period 1–2 | Second policy modification period 1–3 | Third policy modification, period 1–4 | Fourth policy modification period 1–5 | Fifth policy modification period 1–6 | ||||||
---|---|---|---|---|---|---|---|---|---|---|
β (95% CI) | p Value | β (95% CI) | p Value | β (95% CI) | p Value | β (95% CI) | p Value | β (95% CI) | p Value | |
Number of non-smokers | 3546 | 5386 | 5814 | 6683 | 8694 | |||||
Non-smokers | −0.01 (−1.0 to 1.0) | 0.967 | −1.0 (−2.0 to −0.01) | 0.046 | −0.05 (−1.2 to 1.1) | 0.934 | 0.2 (−1.2 to 1.6) | 0.790 | −0.6 (−1.6 to 0.5) | 0.312 |
Number of smokers | 1886 | 2825 | 3037 | 3478 | 4470 | |||||
Smokers | −1.9 (−4.4 to 0.5) | 0.121 | 0.7 (−1.7 to 3.0) | 0.564 | −1.6 (−4.4 to 1.2) | 0.271 | −1.9 (−5.3 to 1.4) | 0.253 | −1.8 (−4.4 to 0.8) | 0.187 |
Results are expressed as β coefficient (g/day) and (95% CI) obtained from quantile regression. Adjusted for previous policy modification(s) (when appropriate), age, gender, body mass index, marital status, education, country of birth and secular trends.