Follow-up participants | Follow-up nonparticipants | p-value | |
Subjects N | 924 | 261 | |
Sex female | 464/924 (50.2) | 113/261 (43.3) | 0.05 |
Mean age years | 34.6 | 33.9 | 0.18## |
Erfurt Centre | 540/924 (58.4) | 127/261 (48.7) | 0.01 |
Asthma at baseline | 40/924 (4.3) | 6/261 (2.3) | 0.13 |
Nasal allergy at baseline | 157/924 (17.0) | 43/261 (16.5) | 0.84 |
Eczema at baseline | 329/924 (35.6) | 93261 (35.6) | 0.99 |
BHR at baseline | 153/778 (19.7) | 44/185 (23.8) | 0.21 |
Family history# | 245/914 (26.8) | 68/255 (26.7) | 0.96 |
Social status¶ | 0.02 | ||
≤16 years | 18/856 (2.1) | 12/233 (5.1) | |
17–23 years | 650/856 (75.9) | 179/233 (76.8) | |
23 years | 188/856 (22.0) | 42/233 (18.0) | |
Pet ownership at baseline | 276/924 (29.9) | 99/259 (38.2) | 0.01 |
Mould exposure ever | 208/916 (22.7) | 59/259 (22.8) | 0.98 |
Job exposure+ ever | 396/923 (42.9) | 120/261 (46.0) | 0.38 |
Current smoking at baseline | 352/924 (38.1) | 117/261 (44.8) | 0.05 |
Any positive SPT§ | 93/924 (10.1) | 25/261 (9.6) | 0.82 |
SPT cat | 27/924 (2.9) | 10/261 (3.8) | 0.46 |
SPT Dermatophagoides pteronyssinus | 46/924 (5.0) | 16/261 (6.1) | 0.46 |
SPT Cladosporium herbarum | 1/924 (0.1) | 0/291 (0.0) | 0.60 |
SPT birch | 56/924 (6.1) | 14/261 (5.4) | 0.67 |
Any positive RASTƒ | 318/924 (34.4) | 107/261 (41.0) | 0.05 |
RAST cat | 63/840 (7.5) | 11/212 (5.2) | 0.24 |
RAST D. pteronyssinus | 127/823 (15.4) | 30/205 (14.6) | 0.78 |
RAST C. herbarum | 50/838 (6.0) | 7/213 (3.3) | 0.12 |
RAST birch | 80/826 (9.7) | 18/208 (8.7) | 0.65 |
Contact with older children in early life | 709/924 (76.7) | 203/261 (77.8) | 0.72 |
Data are presented as n/N (%), unless otherwise stated. BHR: bronchial hyperresponsiveness; SPT: skin prick test; RAST: radioallergosorbent test. #: parental history of asthma, nasal or skin allergy, or eczema; ¶: age at the end of full time education; +: exposed to vapours, gas, dust or fumes in a job; §: at least one positive SPT; ƒ: at least one positive RAST; ##: unpaired t-test, α=5%.