Table 2.
The occurrence of SAR versus year of construction of the house currently inhabited and the presence of central heating
| Factor | Recognized seasonal allergic rhinitis nasal | The odds ratio (OR) | 95% confidence interval (CI) | P-value | |||
|---|---|---|---|---|---|---|---|
| No | Yes | ||||||
| Year of construction of a building (age of building): | |||||||
| 1900–1945 | 237 | 30 | |||||
| 1946–1970 | 389 | 72 | 1.46221 | 0.9272 | 2.3058 | 0.1006 | |
| 1971–1990 | 676 | 133 | 1.55428 | 1.0183 | 2.3723 | 0.0397 | |
| > 1990 | 497 | 101 | 1.60543 | 1.0382 | 2.4826 | 0.0321 | |
| Central heating in the building | No | 268 | 35 | ||||
| yes | 1,928 | 366 | 1.45358 | 1.0044 | 2.1034 | 0.0461 | |
*ORs for year of construction were calculated against data for 1900–1945.