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. Author manuscript; available in PMC: 2020 Mar 1.
Published in final edited form as: Tob Control. 2019 Apr 1;29(2):207–216. doi: 10.1136/tobaccocontrol-2018-054584

Table 3. Odds ratios of linear and quadratic models for ever drunk alcohol and ever cannabis use between 1998-2015 for England, Scotland and Wales.

Ever drunk alcohol Ever used cannabis
Linear p Quadratic p Linear p Quadratic p
Whole sample
(n = 239,190;
239,457)		 Year 0.91 [0.90 to 0.91] <0.001 1.10 [1.08 to 1.12] <0.001 0.92 [0.92 to 0.92] <0.001 1.08 [1.07 to 1.10] <0.001
Year2 - - 0.99 [0.99 to 0.99] <0.001 - - 0.99 [0.99 to 0.99] <0.001
Level 0.90 [0.85 to 0.95] <0.001 0.85 [0.81 to 0.90] <0.001 0.98 [0.90 to 1.07] 0.661 1.01 [0.93 to 1.10] 0.761
Post-slope 0.96 [0.94 to 0.97] <0.001 1.17 [1.14 to 1.19] <0.001 1.00 [0.98 to 1.03] 0.667 1.21 [1.18 to 1.25] <0.001
Male only subgroup
(n = 119,989;
120,025)		 Year 0.91 [0.90 to 0.91] <0.001 1.06 [1.03 to 1.09] <0.001 0.93 [0.92 to 0.93] <0.001 1.06 [1.04 to 1.09] <0.001
Year2 - - 0.99 [0.99 to 0.99] <0.001 - - 0.99 [0.99 to 0.99] <0.001
Level 0.89 [0.82 to 0.96] 0.004 0.85 [0.79 to 0.92] <0.001 0.92 [0.82 to 1.04] 0.185 0.94 [0.84 to 1.06] 0.337
Post-slope 0.96 [0.94 to 0.98] <0.001 1.12 [1.09 to 1.16] <0.001 1.02 [0.99 to 1.05] 0.175 1.20 [1.15 to 1.24] <0.001
Female only subgroup
(n = 119,201;
119,432)		 Year 0.90 [0.90 to 0.91] <0.001 1.15 [1.12 to 1.18] <0.001 0.92 [0.91 to 0.92] <0.001 1.11 [1.08 to 1.14] <0.001
Year2 - - 0.99 [0.98 to 0.99] <0.001 - - 0.99 [0.99 to 0.99] <0.001
Level 0.91 [0.84 to 0.98] 0.016 0.85 [0.79 to 0.92] <0.001 1.06 [0.93 to 1.20] 0.396 1.11 [0.98 to 1.26] 0.110
Post-slope 0.96 [0.94 to 0.97] <0.001 1.22 [1.18 to 1.26] <0.001 0.99 [0.95 to 1.02] 0.359 1.23 [1.17 to 1.28] <0.001
13 year olds only
(n = 124,842;
123,608)		 Year 0.90 [0.90 to 0.90] <0.001 1.11 [1.08 to 1.13] <0.001 0.90 [0.89 to 0.90] <0.001 1.16 [1.12 to 1.21] <0.001
Year2 - - 0.99 [0.99 to 0.99] <0.001 - - 0.98 [0.98 to 0.99] <0.001
Level 0.88 [0.82 to 0.95] 0.001 0.84 [0.78 to 0.91] <0.001 1.07 [0.89 to 1.28] 0.480 1.14 [0.95 to 1.37] 0.165
Post-slope 0.95 [0.93 to 0.97] <0.001 1.17 [1.14 to 1.21] <0.001 0.99 [0.95 to 1.04] 0.746 1.34 [1.26 to 1.42] <0.001
15 year olds only
(n = 114,348;
115,849)		 Year 0.92 [0.91 to 0.92] <0.001 1.08 [1.05 to 1.11] <0.001 0.93 [0.92 to 0.93] <0.001 1.06 [1.04 to 1.08] <0.001
Year2 - - 0.99 [0.99 to 0.99] <0.001 - - 0.99 [0.99 to 0.99] <0.001
Level 0.92 [0.84 to 1.00] 0.049 0.87 [0.80 to 0.95] 0.002 0.96 [0.87 to 1.06] 0.432 0.99 [0.90 to 1.09] 0.776
Post-slope 0.96 [0.94 to 0.98] <0.001 1.13 [1.09 to 1.17] <0.001 1.01 [0.98 to 1.03] 0.645 1.17 [1.13 to 1.20] <0.001