Description of the study population by migration status
| Nonmigrants | Immigrants | Emigrants | |
| Country of residence* | |||
| Australia | 532 | 137 | 20 |
| Belgium | 1080 | 42 | 14 |
| Denmark | 372 | 22 | 9 |
| Estonia | 431 | 0 | 1 |
| France | 1866 | 259 | 29 |
| Germany | 1939 | 44 | 93 |
| Iceland | 550 | 12 | 3 |
| India | 592 | 1 | 17 |
| Ireland | 410 | 44 | 11 |
| Italy | 882 | 12 | 69 |
| Netherlands | 1193 | 54 | 24 |
| New Zealand | 1011 | 243 | 11 |
| Norway | 784 | 51 | 18 |
| Spain | 1902 | 40 | 31 |
| Sweden | 1650 | 206 | 14 |
| Switzerland | 662 | 191 | 11 |
| UK | 1461 | 118 | 173 |
| USA | 521 | 202 | 33 |
| Sex | |||
| M | 8483 (48) | 781 (47) | 292 (50) |
| F | 9355 (52) | 897 (53) | 289 (50) |
| Age yrs* | |||
| 20–25 | 3064 (17) | 180 (11) | 58 (10) |
| 25–30 | 3517 (20) | 247 (15) | 85 (15) |
| 30–35 | 3513 (20) | 361 (22) | 115 (20) |
| 35–40 | 3487 (20) | 379 (23) | 125 (22) |
| 40–45 | 4257 (24) | 511 (30) | 198 (34) |
| Smoking status# | |||
| Non | 7853 (44) | 706 (45) | 255 (44) |
| Current | 6349 (36) | 535 (34) | 202 (35) |
| Ex | 3571 (20) | 326 (21) | 121 (21) |
| Social class*,# | |||
| Nonmanual | 8476 (61) | 591 (61) | 316 (66) |
| Manual | 4195 (30) | 317 (33) | 145 (30) |
| Others | 1174 (8) | 54 (6) | 17 (4) |
| Total | 17838 (100) | 1678 (100) | 581 (100) |
Data are presented as n and n (%)
M: male
F: female
#: Some figures do not add to totals due to nonresponse
*: p<0.05