Table 1.
The occurrence of AR versus year of construction of the house currently inhabited and the presence of central heating
| Factor | Self-reported allergic rhinitis | Odds ratio (OR*) | 95% confidence interval (CI) for OR | P-value of χ2 test | |||
|---|---|---|---|---|---|---|---|
| No | Yes | ||||||
| Year of construction of building (age of building): | |||||||
| 1900–1945 | 1243 | 334 | |||||
| 1946–1970 | 3298 | 955 | 1.0776 | 0.9362 | 1.2403 | 0.2972 | |
| 1971–1990 | 4769 | 1474 | 1.1502 | 1.005 | 1.3154 | 0.0407 | |
| > 1990 | 2708 | 818 | 1.1241 | 0.9735 | 1.2981 | 0.1108 | |
| Central heating | No | 1711 | 449 | ||||
| Yes | 12657 | 3743 | 1.1253 | 1.0079 | 1.2563 | 0.0355 | |
*
ORs for year of construction were calculated against data for 1900–1945.