Table 1.
Demographics, categorised according to mothers’ exposure during pregnancy into seven categories: high-molecular weight (HMW), low-molecular weight/irritants (LMW), mixed (a mixture of HMW and LMW), farmers, unclassifiable, students and references
| During pregnancy Mother |
HMW n=409 |
LMW n=3705 |
Mixed n=7722 |
Farmer n=330 |
Unclassifiable n=2405 |
Student n=3867 |
Reference n=23286 |
Missing (%) |
|---|---|---|---|---|---|---|---|---|
| Age, years, median (10%; 90%) | 29 (24; 35) | 29 (24; 35) | 30 (25; 36) | 30 (24; 36) | 31 (26; 36) | 27 (23; 33) | 30 (26;36) | 0 |
| BMI, median (10%; 90%) | 23.0 (19.5; 31.6) | 23.1 (19.4; 30.5) | 22.6 (19.4; 29.0) | 22.7 (19.7; 28.4) | 22.3 (19.4; 27.3) | 22.0 (19.1; 27.5) | 22.4 (19.4;28.2) | 1.6 |
| Parity | 0.1 | |||||||
| 0 | 50.6 | 48.2 | 48.6 | 45.3 | 53.9 | 66.6 | 51.5 | |
| 1 or 2 | 46.5 | 49.5 | 48.0 | 48.0 | 44.6 | 31.8 | 46.7 | |
| 3+ | 2.9 | 2.4 | 3.4 | 6.7 | 1.5 | 1.6 | 1.8 | |
| Use of medicine | ||||||||
| Acetyl Salicylic Acid | 4.9 | 4.5 | 4.1 | 4.9 | 5.2 | 4.4 | 4.3 | 5.4 |
| Paracetamol | 45.4 | 47.2 | 52.3 | 39.6 | 41.3 | 43.4 | 44.3 | 5.4 |
| Antibiotics | 19.1 | 16.5 | 18.8 | 14.9 | 17.5 | 17.7 | 17.3 | 5.3 |
| Folic acid | 55.5 | 56.0 | 56.1 | 52.1 | 55.4 | 58.3 | 58.3 | 5.2 |
| Rural residence | 15.4 | 8.0 | 7.4 | 44.2 | 6.4 | 3.9 | 5.6 | 0.0 |
| Furry animals* | 63.6 | 49.1 | 41.4 | 67.6 | 34.6 | 29.6 | 35.5 | 0.0 |
| Smoking | 0.0 | |||||||
| No use of tobacco | 75.3 | 67.1 | 77.3 | 82.1 | 85.3 | 79.1 | 81.5 | 0.0 |
| 1–10 cigarettes/day | 9.5 | 15.4 | 11.8 | 7.9 | 8.0 | 10.9 | 10.4 | 0.0 |
| >10 cigarettes/day | 15.2 | 17.4 | 10.9 | 10.0 | 6.7 | 10.0 | 8.2 | 0.0 |
| Atopy† | 15.2 | 19.9 | 22.1 | 17.3 | 21.7 | 23.8 | 21.0 | 0.0 |
| Child | ||||||||
| Boy | 50.1 | 51.1 | 51.5 | 50.3 | 51.7 | 51.8 | 51.2 | 0.0 |
| Birth weight, kg, median (10%; 90%) | 3.60 (2.90; 4.30) | 3.58 (2.88; 4.25) | 3.60 (2.95; 4.25) | 3.65 (2.95; 4.29) | 3.60 (2.98; 4.26) | 3.58 (2.95; 4.21) | 3.60 (2.95; 4.25) | |
| Small for gestational age | 9.6 | 10.8 | 8.7 | 7.9 | 8.5 | 9.7 | 8.7 | 0.3 |
| At 7-year follow-up | ||||||||
| Maternal smoking | 19.3 | 27.5 | 17.5 | 13.9 | 10.7 | 16.1 | 15.1 | 0.0 |
| Paternal smoking | 27.9 | 31.1 | 22.8 | 18.5 | 18.2 | 21.5 | 20.4 | 0.0 |
| Child atopy defined as ever atopic dermatitis | 16.6 | 16.5 | 19.0 | 17.3 | 18.6 | 18.1 | 18.1 | 0.0 |
| Child ETS exposure | 37.4 | 43.6 | 31.5 | 26.4 | 23.8 | 30.0 | 28.1 | 0.0 |
*Ownership of furry animals during pregnancy.
†Atopic status of the women.
The numbers are presented as % unless otherwise stated.
BMI, body mass index; ETS, environmental tobacco smoke.