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Table 1 Response rates by study centres at baseline and follow-up stages a

From: Longterm follow-up in European respiratory health studies – patterns and implications

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%) -
  1. 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.
  2. Response rates are calculated based on those invited to baseline for baseline populations, and based on those participating in baseline for follow-up populations.
  3. bResponse rate for 20-yrs follow-up in Italian ECRHS is calculated based on original response rate in Verona.