Table 1.
Baseline characteristics of ARIES subsample of adolescents from the ALSPAC by current weekly smoking status
| Variable | ARIES (n = 968) |
Current weekly smokers (n = 73) | Nonweekly smokers (n = 761) | P-value difference |
|---|---|---|---|---|
| Sex (% Male) (n) | 48.2 (467) | 21.9 (16) | 48.8 (371) | <0.001 |
| Passive smoke exposure (% yes) (n) | 49.3 (477) | 58.9 (43) | 43.1 (328) | 0.009 |
| Age at DNA methylation collection [mean (SD)] | (n = 968) | (n = 71) | (n = 737) | |
| 17.1 (1.1) | 17.0 (1.2) | 17.2(1.0) | 0.111 | |
| Maternal smoking during pregnancy (% yes) (n) | (n = 945) | (n = 66) | (n = 725) | |
| 10.3 (97) | 22.7 (15) | 8.1 (59) | <0.001 | |
| Manual occupationsa [% (n)] | (n = 879) | (n = 60) | (n = 684) | |
| 14.2 (125) | 21.7 (13) | 13.0 (89) | 0.062 | |
| Regular alcohol consumption (%yes) (n) | (n = 964) | (n = 73) | (n = 752) | |
| 50.4 (486) | 79.4 (58) | 48.9 (368) | <0.001 | |
| Substance use | (n = 968) | (n = 73) | (n = 761) | |
| Regular cannabis use (%yes) (n) | 5.2 (50) | 27.4 (20) | 1.2 (9) | <0.001 |
| Any substance use (%yes) (n) | 43.4 (420) | 89.0 (65) | 34.0 (259) | <0.001 |
Missing current weekly smoking data (n = 134).
aBased on the 1991 OPCS classification.