Odds ratios of linear and quadratic models for smoking attitudes among students in England and Scotland (trying smoking is ‘OK’, from 1999 to 2015) and England only (smoking weekly is ‘OK’, from 2003 to 2014)
Trying smoking is OK* (don’t know=not OK) | Smoking weekly is OK† (don’t know=not OK) | ||||||||
Linear | P value | Quadratic | P value | Linear | P value | Quadratic | P value | ||
Whole sample (n=165 199; 35 890) | Year | 0.91 (0.91 to 0.92) | <0.001 | 0.87 (0.85 to 0.89) | <0.001 | 0.91 (0.90 to 0.92) | <0.001 | 0.72 (0.65 to 0.81) | <0.001 |
Year2 | – | – | 1.00 (1.00 to 1.00) | <0.001 | – | – | 1.01 (1.01 to 1.02) | <0.001 | |
Level | 1.03 (0.97 to 1.10) | 0.330 | 1.05 (0.98 to 1.12) | 0.143 | 1.15 (1.00 to 1.32) | 0.045 | 1.10 (0.96 to 1.27) | 0.152 | |
Post-slope | 0.92 (0.90 to 0.93) | <0.001 | 0.88 (0.86 to 0.90) | <0.001 | 0.95 (0.90 to 1.00) | 0.032 | 0.82 (0.75 to 0.89) | <0.001 | |
Male only subgroup (n=82 270; 18 042) | Year | 0.92 (0.91 to 0.93) | <0.001 | 0.84 (0.81 to 0.87) | <0.001 | 0.92 (0.91 to 0.94) | <0.001 | 0.67 (0.57 to 0.79) | <0.001 |
Year2 | – | – | 1.01 (1.00 to 1.01) | <0.001 | – | – | 1.02 (1.01 to 1.03) | <0.001 | |
Level | 1.08 (0.99 to 1.18) | 0.090 | 1.11 (1.01 to 1.22) | 0.024 | 1.33 (1.10 to 1.62) | 0.004 | 1.27 (1.04 to 1.54) | 0.020 | |
Post-slope | 0.91 (0.89 to 0.93) | <0.001 | 0.84 (0.81 to 0.88) | <0.001 | 0.88 (0.82 to 0.94) | <0.001 | 0.71 (0.62 to 0.81) | <0.001 | |
Female only subgroup (n=82 929; 17 848) | Year | 0.90 (0.90 to 0.91) | <0.001 | 0.89 (0.86 to 0.93) | <0.001 | 0.90 (0.88 to 0.91) | <0.001 | 0.77 (0.66 to 0.91) | 0.001 |
Year2 | – | – | 1.00 (1.00 to 1.00) | 0.492 | – | – | 1.01 (1.00 to 1.02) | 0.067 | |
Level | 0.98 (0.90 to 1.07) | 0.718 | 0.99 (0.90 to 1.08) | 0.789 | 1.02 (0.84 to 1.22) | 0.866 | 0.99 (0.82 to 1.19) | 0.917 | |
Post-slope | 0.93 (0.91 to 0.95) | <0.001 | 0.92 (0.88 to 0.95) | <0.001 | 1.01 (0.95 to 1.08) | 0.720 | 0.92 (0.81 to 1.04) | 0.180 | |
13 year olds only (n=85 713; 18 721) | Year | 0.90 (0.89 to 0.91) | <0.001 | 0.89 (0.86 to 0.92) | <0.001 | 0.90 (0.89 to 0.92) | <0.001 | 0.78 (0.65 to 0.94) | 0.007 |
Year2 | – | – | 1.00 (1.00 to 1.00) | 0.459 | – | – | 1.01 (1.00 to 1.02) | 0.107 | |
Level | 0.95 (0.86 to 1.05) | 0.321 | 0.95 (0.87 to 1.05) | 0.349 | 1.22 (0.97 to 1.53) | 0.086 | 1.19 (0.94 to 1.49) | 0.145 | |
Post-slope | 0.94 (0.92 to 0.97) | <0.001 | 0.93 (0.90 to 0.97) | <0.001 | 0.93 (0.85 to 1.01) | 0.092 | 0.84 (0.73 to 0.98) | 0.022 | |
15 year olds only (n=79 486; 17 169) | Year | 0.93 (0.92 to 0.94) | <0.001 | 0.86 (0.83 to 0.89) | <0.001 | 0.91 (0.90 to 0.93) | <0.001 | 0.70 (0.60 to 0.80) | <0.001 |
Year2 | – | – | 1.00 (1.00 to 1.01) | <0.001 | – | – | 1.01 (1.01 to 1.02) | <0.001 | |
Level | 1.09 (1.01 to 1.19) | 0.034 | 1.13 (1.04 to 1.23) | 0.006 | 1.11 (0.94 to 1.32) | 0.218 | 1.06 (0.90 to 1.26) | 0.473 | |
Post-slope | 0.89 (0.87 to 0.91) | <0.001 | 0.83 (0.80 to 0.86) | <0.001 | 0.96 (0.90 to 1.02) | 0.144 | 0.80 (0.71 to 0.89) | <0.001 |
*Available for England and Scotland only.
†Available for England only.