Table 2.
The odds ratios for any of the suicide related behaviors (intentional self-injury and/or suicide ideation) at age 22 according to tobacco use behavior in a population-based sample of twins.
| Model 1 (Adjusted for age and sex) |
Model 2 (Adjusted for age, sex, baseline school achievement, depression, impulsivity, alcohol, and parental education) |
|||||
|---|---|---|---|---|---|---|
| Age of regular tobacco use initiation (n=674 females)3 | OR | 95%CI | p-value | AOR | 95%CI | p-value |
| Never | 1.00 | 1.00 | ||||
| Late onset tobacco use1 | 1.79 | 1.23,2.60 | .002 | 1.92 | 1.27,2.92 | .002 |
| Early onset tobacco use2 | 3.53 | 1.67,7.45 | .001 | 3.97 | 1.73,9.13 | .001 |
| Cigarette smoking at baseline (n=1265) | OR | 95%CI | p-value | AOR | 95%CI | p-value |
| Never | 1.00 | 1.00 | ||||
| Experimenting | 1.30 | 0.59,1.76 | .091 | 1.33 | 0.96,1.85 | .090 |
| Occasional | 1.23 | 0.64,2.37 | .535 | 1.42 | 0.67,3.00 | .365 |
| Daily | 1.79 | 1.06,3.01 | .029 | 2.13 | 1.12,4.07 | .022 |
1
Late-onset tobacco use = ≥ 14 years of age
2
Early–onset tobacco use = <14 years of age
3
Sex interaction: Likelihood-ratio test LR chi2 (2) = 7.08; p=.029