Inflammatory potential corrected by the TNF control of sampled dust from selected rooms of the 10 schools with low prevalence of symptoms and the 10 schools with high prevalence of symptoms, defined according to average prevalence of BRS
| Inflammatory potential (ng IL-8/mg dust), median (min–max) | ||
|---|---|---|
| Dust samples from: | 10 low prevalence schools | 10 high prevalence schools |
| Statistics: Mann Whitney U rank sum test. | ||
| Surface (p=0.8) (pooled samples) | 9.8 (3.6–14.9) (n=10) | 11.7 (1.1–28.6) (n=11) |
| Floor (p<0.0001) | 1.8 (0.1–6.1) (n=46) | 3.5 (0.8–11.8) (n=49) |
| Exhaust outlets (p=0.19) | 3.8 (0.2–30.5) (n=23) | 10.2 (0.7–20.6) (n=19) |