Table 1 Participation and reasons for non-participation in ISAAC Phase Two, SOLAR I and SOLAR II
From: Study on Occupational Allergy Risks (SOLAR II) in Germany: Design and methods
| Â | Total | Munich | Dresden |
|---|---|---|---|
| Â | n (%) | n (%) | n (%) |
ISAAC Phase Two Questionnaire study | 6399 (85.3)1 | 3354 (87.6) | 3045 (83.0) |
SOLAR I | 3785 (77.4)2 | 2043 (81.5) | 1742 (73.0) |
of these: | Â | Â | Â |
Agreed to be re-contacted | 3053 (80.7) | 1534 (75.1) | 1519 (87.2) |
SOLAR II | Â | Â | Â |
Drop-outs in total | 149 (4.9) | 85 (5.5) | 64 (4.2) |
Address could not be found via population registries | 143 (4.7) | 82 (5.3) | 61 (4.0) |
Deceased | 6 (0.2) | 3 (0.2) | 3 (0.2) |
Eligible study population | 2904 (100.0) | 1449 (100.0) | 1455 (100.0) |
Refusals in total | 853 (29.4) | 441 (30.4) | 412 (28.3) |
of these | Â | Â | Â |
Could not be reached by phone/no phone number available | 454 (53.3) | 184 (41.7) | 270 (65.5) |
Lack of interest/time | 262 (30.7) | 146 (33.0) | 116 (28.2) |
Absence from study location during the entire field phase | 59 (6.9) | 41 (9.3) | 18 (4.4) |
Other reasons | 78 (9.1) | 70 (15.8) | 8 (1.9) |
Response: questionnaire part | 2051 (70.6) | 1008 (69.6) | 1043 (71.1) |
Response: clinical study | 1167 (40.2) | 568 (39.2) | 599 (41.2) |