Number of subjects randomly selected for the second stage of the European Community Respiratory Health Survey and number (%) of participants
| Country | Centre | Subjects selected | Participants | |
|---|---|---|---|---|
| N | n | % | ||
| Spain | Barcelona | 534 | 393 | 73.6 |
| Galdakao | 576 | 486 | 84.4 | |
| Albacete | 658 | 435 | 66.1 | |
| Oviedo | 522 | 357 | 68.4 | |
| Huelva | 478 | 271 | 56.7 | |
| France | Bordeaux | 2936 | 544 | 18.5 |
| Grenoble | 1165 | 485 | 41.6 | |
| Montpellier | 3736 | 456 | 12.2 | |
| Paris | 3113 | 652 | 20.9 | |
| Italy | Pavia | 816 | 312 | 38.2 |
| Turin | 518 | 244 | 47.1 | |
| Verona | 504 | 354 | 70.2 | |
| Switzerland | Basel | 1210 | 853 | 70.5 |
| Germany | Hamburg | 3312 | 1252 | 37.8 |
| Erfurt | 1076 | 731 | 67.9 | |
| Belgium | Antwerp South | 800 | 558 | 69.7 |
| Antwerp City | 867 | 564 | 65.1 | |
| The Netherlands | Groningen | 599 | 427 | 71.3 |
| Bergen-op-Zoom | 638 | 496 | 77.7 | |
| Geleen | 671 | 439 | 65.4 | |
| Denmark | Aarhus | 652 | 394 | 60.4 |
| Sweden | Goteborg | 772 | 682 | 88.3 |
| Umea | 611 | 552 | 90.3 | |
| Uppsala | 709 | 625 | 88.2 | |
| Norway | Bergen | 969 | 969 | 100.0 |
| Iceland | Reykjavik | 672 | 570 | 84.8 |
| Ireland | Dublin | 599 | 454 | 75.8 |
| UK | Cambridge | 527 | 277 | 52.6 |
| Ipswich | 682 | 448 | 65.7 | |
| Norwich | 655 | 473 | 72.2 | |
| USA | Portland | 1604 | 734 | 45.8 |
| Australia | Melbourne | 1644 | 669 | 40.7 |
| New Zealand | Wellington | 741 | 481 | 64.9 |
| Christchurch | 712 | 459 | 64.5 | |
| Hawkes Bay | 549 | 316 | 57.6 | |
| Total | 36827 | 18412 | 50.0 | |