Table 1.
Description of the 390 homes in the case–control study.
| No. of buildings with different characteristics (%)
|
||||
|---|---|---|---|---|
| Building characteristicsa | Single-family houses | Chain houses | Multifamily houses | Total |
| No. of buildings in the study | 323 (82.8) | 23 (5.9) | 44 (11.3) | 390 (100) |
| Flooring material in child’s bedroom | ||||
| PVC | 167 (52.0) | 12 (52.2) | 32 (72.7) | 211 (54.4) |
| Wood/parquet | 108 (33.6) | 7 (30.4) | 5 (11.4) | 120 (30.9) |
| Laminate | 34 (10.6) | 2 (8.7) | 3 (6.8) | 39 (10.1) |
| Linoleum | 8 (2.5) | 1 (4.3) | 4 (9.1) | 13 (3.4) |
| Wall-to-wall carpet | 3 (0.9) | 1 (4.3) | 0 (0) | 4 (1.0) |
| Other | 1 (0.3) | 0 (0) | 0 (0) | 3 (0.8) |
| Wall material in child’s bedroom | ||||
| Wallpaper | 230 (71.2) | 12 (52.2) | 39 (88.6) | 281 (72.0) |
| Painted wallpaper | 41 (12.7) | 5 (21.7) | 4 (9.1) | 50 (12.8) |
| Painted glass fiber | 27 (8.3) | 4 (17.4) | 0 (0) | 31 (7.9) |
| Vinyl | 29 (9.0) | 4 (17.4) | 4 (9.1) | 37 (9.5) |
| Wood | 11 (3.4) | 0 (0) | 0 (0) | 11 (2.8) |
| Textile | 1 (0.3) | 0 (0) | 0 (0) | 1 (0.2) |
| Construction period | ||||
| Before 1940 | 101 (31.1) | 1 (4.3) | 7 (15.9) | 109 (27.9) |
| 1940–1960 | 58 (18.0) | 2 (8.7) | 10 (22.7) | 70 (17.9) |
| 1961–1970 | 34 (10.5) | 4 (17.4) | 13 (29.5) | 51 (13.1) |
| 1971–1976 | 46 (14.2) | 6 (26.1) | 3 (6.8) | 55 (14.1) |
| 1977–1983 | 48 (14.9) | 2 (8.7) | 1 (2.3) | 51 (13.1) |
| 1984–1993 | 29 (9.0) | 6 (26.1) | 7 (15.9) | 42 (10.8) |
| After 1993 | 7 (2.2) | 2 (8.7) | 3 (6.8) | 12 (3.1) |
| Ventilation system | ||||
| Natural including kitchen fan | 233 (74.4) | 6 (28.6) | 10 (22.7) | 249 (65.9) |
| Mechanical exhaust | 51 (16.3) | 11 (52.4) | 30 (68.2) | 92 (24.3) |
| Mechanical exhaust and supply | 29 (9.3) | 4 (19.0) | 4 (9.1) | 37 (9.8) |
| Self-reported water leakageb | ||||
| Yes, during previous 3 years | 68 (21.5) | 8 (34.8) | 7 (16.7) | 83 (21.7) |
| No | 222 (70.0) | 13 (56.5) | 28 (66.7) | 263 (68.8) |
| Don’t know | 27 (8.5) | 2 (8.7) | 7 (16.7) | 36 (9.4) |
a
Data from inspections of the buildings in DBH phase 2 except for flooding, which was collected in the first questionnaire in DBH phase 1.
b
Data from questionnaire investigation in DBH phase 1, which was collected 18 months before the exposure measurements were conducted.