Table 2 Background characteristics of study subjects in Sollentuna, Sweden 1997.
| n (%) | Mean (SD) | |
|---|---|---|
| Age (years) | 48 (16) | |
| Sex | ||
| Male | 310 (46) | |
| Female | 357 (54) | |
| Smoking | ||
| Never smokers | 341 (52) | |
| Former smokers | 187 (28) | |
| Number of cigarettes | 14 (8) | |
| Current smokers | 131 (20) | |
| Number of cigarettes | 13 (8) | |
| Occupation | ||
| Within the working force* | 465 (73) | |
| Retired | 100 (15) | |
| Otherwise outside the working force† | 74 (12) | |
| Type of residence | ||
| Apartment | 278 (42) | |
| Single family house | 384 (58) | |
| Duration of residence (years) | ||
| <1 | 75 (11) | |
| 1–10 | 293 (44) | |
| >10 | 297 (45) | |
| Window type | ||
| Triple glazing | 418 (65) | |
| Double glazing | 228 (35) | |
| Building year | ||
| Up to 1975 | 423 (66) | |
| After 1975 | 215 (34) | |
| Bedroom window | ||
| Facing the street | 331 (51) | |
| Facing other | 318 (49) |
*Employed, self‐employed, on parental leave, student.
†Homemakers, unemployed, on disability or sick leave.