Allergen concentrations in house dust samples from three different sampling locations expressed as ng per gram of dust
| Allergen | Sampling location | ||
| Mattress | Bedroom floor* | Living room floor# | |
| Total subjects n | 405 | 365 | 405 |
| Der p 1 | 169 (125–228) | 55 (41–75) | 26 (21–33) |
| Der f 1 | 421 (305–581) | 188 (141–252) | 83 (64–108) |
| Der p 1+Der f 1 | 1403 (1041–1890) | 212 (165–273) | 523 (392–700) |
| Fel d 1 | 424 (313–573) | 469 (342–644) | 575 (425–776) |
| Endotoxin | NM | NM | 2274 (2030–2547) |
Data are presented as geometric means (GM) with 95% confidence intervals (CI) in parentheses unless otherwise stated.
Der p 1: Dermatophagoides pteronyssinus antigen 1
Der f 1: D. farinae antigen 1
Fel d 1: cat antigen d 1
NM: not measured
*: there were no separate bedrooms in 40 homes
#: rooms used as both bedroom and living room were defined as living rooms. Concentrations less than the detection limit were estimated by one-half of the detection limit