| Unadjusted | Adjusted for sex and social grade and population-level policies | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
OR | 95%CI | p | BFs | OR | 95%CI | p | BFs | |||
Lower | Upper | Lower | Upper | |||||||
Current smoking | ||||||||||
 Trend | 0.982 | 0.956 | 1.008 | 0.179 |  | 0.979 | 0.954 | 1.006 | 0.127 |  |
 Level | 0.903 | 0.670 | 1.218 | 0.504 |  | 0.807 | 0.456 | 1.426 | 0.460 |  |
 Change in slope | 1.012 | 0.985 | 1.039 | 0.389 |  | 1.012 | 0.986 | 1.041 | 0.364 |  |
 Age (16–17 ref) | 1.922 | 1.523 | 2.426 | < 0.001 |  | 1.953 | 1.542 | 2.475 | < 0.001 |  |
 Level × age | 1.113 | 0.838 | 1.378 | 0.458 | 0.80 | 1.103 | 0.827 | 1.472 | 0.504 | 0.75 |
 Slope × age | 1.001 | 0.999 | 1.004 | 0.233 | 1.22 | 1.002 | 0.999 | 1.004 | 0.141 | 2.10 |
Ever smoking | ||||||||||
 Trend | 0.981 | 0.955 | 1.007 | 0.145 |  | 0.978 | 0.953 | 1.004 | 0.103 |  |
 Level | 0.950 | 0.713 | 1.267 | 0.727 |  | 0.899 | 0.520 | 1.552 | 0.702 |  |
 Change in slope | 1.012 | 0.986 | 1.039 | 0.358 |  | 1.012 | 0.985 | 1.040 | 0.374 |  |
 Age (16–17 ref) | 2.116 | 1.690 | 2.649 | < 0.001 |  | 2.139 | 1.703 | 2.686 | < 0.001 |  |
 Level × age | 1.044 | 0.785 | 1.371 | 0.755 | 0.52 | 1.036 | 0.786 | 1.366 | 0.803 | 0.50 |
 Slope × age | 1.002 | 1.000 | 1.005 | 0.040 | 2.10 | 1.003 | 1.000 | 1.005 | 0.019 | 4.20 |
Trend after 16–17 | 0.993 | 0.942 | 1.046 |  |  | 0.990 | 0.939 | 1.044 |  |  |
Trend after 18–24 | 0.995 | 0.942 | 1.052 |  |  | 0.993 | 0.939 | 1.049 |  |  |
Quit attempts | ||||||||||
 Trend | 0.985 | 0.945 | 1.027 | 0.485 |  | 0.984 | 0.944 | 1.027 | 0.464 |  |
 Level | 0.529 | 0.322 | 0.902 | 0.019 |  | 0.311 | 0.117 | 0.825 | 0.019 |  |
 Change in slope | 1.011 | 0.970 | 1.055 | 0.598 |  | 1.014 | 0.971 | 1.058 | 0.526 |  |
 Age (16–17 ref) | 0.587 | 0.394 | 0.874 | 0.009 |  | 0.585 | 0.393 | 0.872 | 0.009 |  |
 Level × age | 1.770 | 1.081 | 2.899 | 0.023 | 5.68 | 1.760 | 1.075 | 2.884 | 0.025 | 5.49 |
 Slope × age | 0.998 | 0.994 | 1.003 | 0.440 | 0.71 | 0.998 | 0.994 | 1.003 | 0.460 | 0.71 |
Level 16–17 | 0.529 | 0.322 | 0.902 |  |  | 0.311 | 0.117 | 0.825 |  |  |
Level 18–24 | 0.936 | 0.348 | 2.615 |  |  | 0.547 | 0.126 | 2.379 |  |  |