Ever drunk alcohol | Ever used cannabis | ||||||||
Linear | P value | Quadratic | P value | Linear | P value | Quadratic | P value | ||
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 |