Anthropometric measures and proportional size are given by tobacco exposure groups for 2313 newborn infants
| Subjects | Tobacco exposure during pregnancy# | ||||
| Never | Snus only | Smoke/dual | p-value | ||
| Anthropometric measures | 2061 (89.1) | 150 (6.5) | 102 (4.4) | ||
| Birthweight g | 2252 | 3577 (3556–5598) | 3662 (3591–3733) | 3575 (3472–3678) | 0.11 |
| Length cm | 2181 | 50.5 (50.4–50.6) | 50.8 (50.4–51.1) | 50.4 (49.9–50.9) | 0.26 |
| Head circumference cm | 2238 | 35.2 (35.1–35.3) | 35.5 (35.3–35.8) | 35.3 (34.9–35.6) | 0.029 |
| Thoracic circumference cm | 2157 | 34.0 (33.9–34.1) | 34.2 (33.9–34.5) | 34.2 (33.7–34.7) | 0.30 |
| Abdominal circumference cm | 2156 | 32.8 (32.7–32.8) | 32.9 (32.5–33.3) | 32.7 (32.2–33.2) | 0.79 |
| Left mid upper arm circumference cm | 2166 | 11.1 (11.1–11.2) | 11.3 (11.2–11.5) | 11.2 (11.0–11.4) | 0.15 |
| Proportional size | |||||
| Abdominal/head circumference | 2102 | 0.94 (0.93–0.94) | 0.92 (0.92–0.94) | 0.93 (0.91–0.94) | 0.45 |
| Thoracic/abdominal circumference | 2151 | 1.04 (1.037–1.04) | 1.04 (1.04–1.05) | 1.05 (1.04–1.06) | 0.14 |
| Thoracic/head circumference | 2103 | 0.97 (0.965–0.97) | 0.96 (0.96–0.97) | 0.97 (0.96–0.98) | 0.68 |
| Birthweight/placenta weight | 1729 | 5.6 (5.5–5.7) | 5.5 (5.4–5.7) | 5.7 (5.5–6.0) | 0.54 |
Data are presented as n (%), n or mean (95% CI), unless otherwise stated. The reference group “never” includes all females who did not report use of tobacco or nicotine during pregnancy. The “smoke/dual” group includes dual smokers and snus users during pregnancy. Most of these subjects (>90%) quit snus use or smoking by 6 weeks of pregnancy. #: includes four females who answered “yes” to ever-use of other nicotine products (nicotine replacement therapy or electronic cigarettes); one was a daily user during pregnancy at 18 weeks and three quit when recognising pregnancy.