Relation of maternal, paternal and parental smoking with active smoking for the 519 participants in this study
| Mother smoked at child's birth | Father smoked at child's birth | Any parent smoked at child's birth | |||||||
|---|---|---|---|---|---|---|---|---|---|
| No | Yes | p Value | No | Yes | p Value | No | Yes | p Value | |
| N | 443 | 76 | 380 | 139 | 351 | 168 | |||
| YR16 (N=387) | |||||||||
| % Participants smoked at age 16 | 9.6 | 21.8 | 0.008 | 9.1 | 17.6 | 0.02 | 9.2 | 16.0 | 0.05 |
| Usual N cigarettes smoked at age 16* median (IQR) | 3 (0.4–8) | 7 (4.5–10) | 0.04 | 3 (1–6.5) | 6 (1–10) | 0.22 | 3 (1–8) | 6 (1–10) | 0.35 |
| YR22 (N=499) | |||||||||
| % Participants smoked at age 22 | 25.5 | 45.1 | 0.001 | 24.1 | 39.6 | 0.001 | 22.3 | 40.7 | <0.001 |
| Usual N cigarettes smoked at age 22* median (IQR) | 7 (2–12) | 10 (5–12) | 0.11 | 7 (2–13.5) | 10 (4–11) | 0.39 | 7 (1.5–13.5) | 10 (3–12) | 0.26 |
| YR26 (N=464) | |||||||||
| % Participants smoked at age 26 | 21.7 | 41.2 | 0.001 | 21.2 | 33.3 | 0.007 | 20.2 | 33.6 | 0.002 |
| Usual N cigarettes smoked at age 26* median (IQR) | 5 (2–15) | 8.5 (5–11) | 0.35 | 5 (2–15) | 9 (4–13) | 0.20 | 5 (2–15) | 8.5 (4–13) | 0.28 |
| YR16 to YR26 (N=519) | |||||||||
| % Participants ever smoked between age 16 and 26 | 31.6 | 52.6 | <0.001 | 30.8 | 45.3 | 0.002 | 29.1 | 46.4 | <0.001 |
| N pack-years smoked by age 26 years* median (IQR) | 2.9 (0.8–7.0) | 3.7 (1.7–6.6) | 0.25 | 2.7 (0.8–6.9) | 3.8 (1.4–7.0) | 0.22 | 2.7 (0.8–7.0) | 3.7 (1.2–6.7) | 0.25 |
*Computed only among active smokers.
YR16, age 16 years; YR22 age 22 years; YR26, age 26 years.