Table 1.
Response rates by study centres at baseline and follow-up stages a
| Study center | Baseline | 10-yrs follow-up | 20-yrs follow-up |
|---|---|---|---|
| RHINE |
|
|
|
| Aarhus |
3614 (85%) |
2 589 (72%) |
1959 (54%) |
| Bergen |
3449 (82%) |
2 506 (73%) |
1833 (53%) |
| Gothenburg |
2861 (83%) |
2 175 (76%) |
1496 (52%) |
| Reykjavik |
2899 (84%) |
1 967 (68%) |
1572 (54%) |
| Tartu |
2449 (85%) |
1 705 (70%) |
1066 (44%) |
| Umea |
3273 (92%) |
2 621 (80%) |
1745 (53%) |
| Uppsala |
3114 (89%) |
2 543 (82%) |
1770 (57%) |
| TOTAL |
21 659 (86%) |
16 106 (75%) |
11 441 (53%) |
| Italian ECRHS |
|
|
|
| Verona |
2711 (92%) |
1737 (64%) |
1338 (49%) |
| Pavia |
816 (86%) |
701 (86%) |
- |
| Turin |
2502 (84%) |
1443 (58%) |
- |
| TOTAL |
6 029 (88%) |
3 881 (64%) |
1338 (49%)b |
| ISAYA |
|
|
|
| Verona |
2158 (74%) |
1421 (66%) |
- |
| Sassari |
2053 (70%) |
810 (39%) |
- |
| TOTAL | 4 211 (72%) | 2 231 (53%) | - |
aSubjects who have answered one or more of the following questions at each of the relevant study stages: asthma, hay fever, wheeze. Baseline: 1989–92 in RHINE, 1991–93 in Italian ECRHS, 1998–2000 in ISAYA. 10-yrs follow-up: 1999–2000 in RHINE, 1998-2000 in Italian ECRHS, 2008–09 in ISAYA. 20-yrs follow-up: 2010–12 in RHINE, 2008–09 in Italian ECRHS.
Response rates are calculated based on those invited to baseline for baseline populations, and based on those participating in baseline for follow-up populations.
bResponse rate for 20-yrs follow-up in Italian ECRHS is calculated based on original response rate in Verona.