Table 1.
Participation in the SOLAR study phases.
| Total | Munich | Dresden | |
|---|---|---|---|
| n (%) | n (%) | n (%) | |
|
ISAAC Phase II (Questionnaire study) |
6,399 (85.3)a | 3,354 (87.6) | 3,045 (83.0) |
| SOLAR I | 3,785 (77.4)b | 2,043 (81.5) | 1,742 (73.0) |
| Agreed to be re-contacted | 3,053 (80.7) | 1,534 (75.1) | 1,519 (87.2) |
| SOLAR II | 2,051 (70.6)c | 1,008 (69.6) | 1,043 (71.1) |
| SOLAR III | |||
| Contacted | 3,053 (100.0) | 1,534 (100.0) | 1,519 (100.0) |
| Lost participants | 182 (6.0) | 46 (3.0) | 136 (9.0) |
| No valid address available | 153 (5.0) | 33 (2.2) | 120 (7.9) |
| Deceased | 15 (0.5) | 6 (0.4) | 9 (0.6) |
| Participant refused further contact | 14 (0.5) | 7 (0.5) | 7 (0.5) |
| Eligible sample | 2,871 (94.0) | 1,488 (97.0) | 1,383 (91.0) |
| Response | 1,359 (47.3)d | 585 (39.3) | 774 (56.0) |
| of these | |||
| Participation in SOLAR II | 1,143 (84.1) | 496 (84.8) | 647 (83.6) |
| No participation in SOLAR II | 216 (15.9) | 89 (15.2) | 127 (16.4) |
| Online questionnaire | 787 (57.9) | 323 (55.2) | 464 (59.9) |
| Paper questionnaire | 572 (42.1) | 262 (44.8) | 310 (40.1) |
a
6,399 of 7,498 invited children.
b
3,785 of 4,893 invited adolescents who could be re-contacted.
c
2,051 of 2,904 invited adults who could be re-contacted.
d
1,359 of 2,871 eligible participants.