Table 1. Characteristics and measured exposure of the schools (latest measurement used).
| All school buildings: | Buildings measuredin fall 2009 | Buildings measuredin winter 2010 | |
| Number | 19 | 6 | 13 |
| Total number of classrooms | 123 | 88 | 35 |
| Moisture damaged school building | 8 | 3 | 5 |
| Age of the building (years, range) | 30 (2–79) | 36 (2–79) | 28 (12–69) |
| Number of floor levels (range) | 1–3 | 1–2 | 1–3 |
| Socioeconomic status (mean years education of parents, SD) | 14.4 (2.6) | 15.0 (1.5) | 13.6 (3.9) |
| Self-reported pet ownership per class (mean %) | 38% | 30% | 43% |
| Self-reported cat ownership per class (mean %) | 25% | 16% | 21% |
| Self-reported dog ownership per class (mean %) | 19% | 22% | 15% |
| Class room levels of: | |||
| β (1,3) glucans (ng/m2/week, GM (GSD)) | 1258 (1.88) | 1345 (2.33) | 1211 (1.72) |
| DM antigen (ng/m2/week, GM (GSD)) | 133.5 (2.59) | 257.5 (2.99) | 104.6 (2.23) |
| Cat allergen (ng/m2/week, GM (GSD)) | 60.6 (2.45) | 38.6 (3.46) | 74.3 (1.90) |
| Dog allergen (ng/m2/week, GM (GSD)) | 35.8 (3.34) | 14.3 (5.81) | 53.8 (1.85) |
| Mouse allergen (ng/m2/week, GM (GSD)) | 1.16 (3.04) | 1.0 (2.13) | 1.3 (3.33) |
SD: standard deviation.
GM: geometric mean.
GSD: geometric standard deviation.