Unadjusted and adjusted odds ratios of starting current smoking for the first time at year 8, year 9, year 10 and year 11 as a function of being a year 7 “one time trier” in relation to never smoking
| Unadjusted odds OR (95% CI) | Year 8 (n = 1900) | Year 9 (n = 1721) | Year 10 (n = 1514) | Year 11 (n = 1283) |
|---|---|---|---|---|
| Year 7 Smoking | ||||
| Never tried | 1 | 1 | 1 | 1 |
| Tried just once | 7.0*** (4.36 to 11.10) | 3.0*** (1.89 to 4.67) | 2.1** (1.27 to 3.41) | 1.1 (0.53 to 2.09) |
| Adjusted odds OR (95% CI) | Year 8 (n = 1888) | Year 9 (n = 1709) | Year 10 (n = 1503) | Year 11 (n = 1273) |
|---|---|---|---|---|
| *p<0.05; **p<0.01; ***p<0.0005. | ||||
| Year 7 smoking | ||||
| Never tried | 1 | 1 | 1 | 1 |
| Tried just once | 6.3*** (3.80 to 10.53) | 2.9*** (1.79 to 4.73) | 2.1** (1.22 to 3.51) | 1.0 (0.49 to 2.02) |
| Covariates | ||||
| Sex | ||||
| Boys | 1 | 1 | 1 | 1 |
| Girls | 2.8*** (1.68 to 4.59) | 2.0*** (1.37 to 2.85) | 1.4 (0.97 to 1.90) | 1.2 (0.83 to 1.71) |
| Deprivation | 0.94 (0.78 to 1.14) | 1.0 (0.86 to 1.15) | 0.90 (0.79 to 1.03) | 1.1 (0.96 to 1.28) |
| Ethnicity | ||||
| White | 1 | 1 | 1 | 1 |
| Black | 1.0 (0.54 to 1.87) | 0.41** (0.24 to 0.73) | 0.45** (0.26 to 0.77) | 0.40*** (0.21 to 0.65) |
| Asian | 0.91 (0.37 to 2.23) | 0.41* (0.20 to 0.83) | 0.62 (0.35 to 1.09) | 0.60 (0.32 to 1.03) |
| Other | 0.96 (0.20 to 4.52) | 0.46 (0.11 to 2.00) | 0.40 (0.09 to 1.72) | 0.65 (0.19 to 2.23) |
| Parental smoking | ||||
| Neither smoke | 1 | 1 | 1 | 1 |
| Father smokes | 0.96 (0.48 to 1.90) | 1.3 (0.81 to 2.06) | 1.4 (0.95 to 2.21) | 1.3 (0.83 to 2.07) |
| Mother smokes | 2.1 (1.00 to 4.22) | 1.8* (1.00 to 3.18) | 1.5 (0.81 to 2.72) | 1.3 (0.69 to 2.63) |
| Both smoke | 2.9** (1.52 to 5.42) | 1.2 (0.61 to 2.17) | 1.8* (1.06 to 3.19) | 0.73 (0.35 to 1.54) |
| Conduct problems score | 1.1 (0.94 to 1.22) | 1.1 (0.98 to 1.21) | 1.1* (1.00 to 1.22) | 1.1** (1.04 to 1.27) |