Prevalence of parental smoking by country in study subjects born 1945–72
| Country | No | Paternal smoking (%)* | Maternal smoking (%)* | Maternal smoking in pregnancy (%)* |
|---|---|---|---|---|
| *Subjects answering “don’t know” to question on paternal or maternal smoking are excluded. | ||||
| Iceland | 564 | 58 | 41 | 17 |
| Norway | 835 | 65 | 33 | 15 |
| Sweden | 1856 | 59 | 36 | 16 |
| Estonia | 431 | 63 | 10 | 2 |
| Ireland | 454 | 76 | 50 | 27 |
| Great Britain | 1579 | 68 | 43 | 20 |
| Netherlands | 1247 | 79 | 34 | 13 |
| Belgium | 1122 | 70 | 27 | 11 |
| Germany | 1983 | 67 | 27 | 5 |
| Switzerland | 853 | 57 | 21 | 4 |
| France | 2125 | 66 | 16 | 4 |
| Spain | 1942 | 71 | 3 | 1 |
| Italy | 894 | 71 | 17 | 5 |
| New Zealand | 1254 | 66 | 43 | 14 |
| Australia | 668 | 62 | 34 | 18 |
| USA | 723 | 63 | 44 | 24 |
| Denmark | 391 | 76 | 53 | 23 |
| Total | 18922 | 67 | 28 | 11 |