Table 1.
Characteristics of the study population
| Inner city | Suburb of city | Small town | Village in rural area | Farm without livestock | Farm with livestock | All analysed | Missing, N (%) | |
|---|---|---|---|---|---|---|---|---|
| Subjects, N | 2,086 | 4,047 | 3,206 | 1,905 | 311 | 1,821 | 13,376 | 0 (0%) |
| Age in 2011±SD | 52.6 (±7.0) | 50.8 (±7.1) | 51.2 (±7.0) | 53.1 (±7.2) | 51.6 (±6.7) | 54.7 (±6.7) | 52.1 (±7.1) | 308 (2%) |
| Sex, N (%F) | 1,042 (50%) | 2,093 (52%) | 1,688 (53%) | 1,075 (57%) | 153 (49%) | 1,023 (56%) | 7,074 (53%) | 16 (1%) |
| Smoking status | 4,249 (31%) | |||||||
| Current smoker, N (%) | 166 (12%) | 323 (12%) | 199 (9%) | 101 (7%) | 20 (10%) | 75 (6%) | 884 (10%) | |
| Ex-smoker, N (%) | 452 (34%) | 876 (33%) | 698 (31%) | 467 (34%) | 65 (32%) | 394 (32%) | 2,952 (32%) | |
| Never smoker, N (%) | 719 (54%) | 1,492 (55%) | 1,365 (60%) | 818 (59%) | 120 (58%) | 777 (62%) | 5,291 (58%) | |
| Parental smoking in childhood | 537 (4%) | |||||||
| No parental smoking, N (%) | 516 (26%) | 1,198 (30%) | 1,036 (33%) | 642 (35%) | 92 (30%) | 779 (45%) | 4,263 (33%) | |
| Mother smoked, N (%) | 159 (8%) | 313 (8%) | 234 (8%) | 113 (6%) | 26 (9%) | 89 (5%) | 934 (7%) | |
| Father smoked, N (%) | 604 (30%) | 1,237 (32%) | 886 (29%) | 626 (35%) | 97 (32%) | 637 (37%) | 4,087 (32%) | |
| Both parents smoked, N (%) | 708 (36%) | 1,153 (30%) | 937 (30%) | 434 (24%) | 88 (29%) | 235 (13%) | 3,555 (28%) | |
| Parental asthma | 76 (1%) | |||||||
| Mother, N (%) | 186 (9%) | 338 (8%) | 254 (8%) | 142 (7%) | 29 (9%) | 151 (8%) | 1,100 (8%) | |
| Father, N (%) | 100 (5%) | 194 (5%) | 149 (5%) | 98 (5%) | 19 (6%) | 93 (5%) | 653 (5%) | |
| Both parents asthma, N (%) | 12 (1%) | 24 (1%) | 13 (1%) | 15 (1%) | 2 (1%) | 10 (1%) | 76 (1%) | |
| Centre | 0 (0%) | |||||||
| Aarhus, N (%) | 430 (18%) | 713 (31%) | 548 (24%) | 319 (14%) | 33 (1%) | 281 (12%) | 2,324 (17%) | |
| Reykjavik, N (%) | 350 (18%) | 792 (42%) | 507 (27%) | 80 (4%) | 20 (1%) | 158 (8%) | 1,907 (14%) | |
| Bergen, N (%) | 432 (18%) | 741 (32%) | 621 (27%) | 92 (4%) | 168 (7%) | 284 (12%) | 2,338 (18%) | |
| Gothenburg, N (%) | 297 (18%) | 764 (45%) | 275 (16%) | 224 (13%) | 19 (1%) | 117 (7%) | 1,696 (13%) | |
| Umeå, N (%) | 105 (5%) | 166 (9%) | 531 (28%) | 597 (31%) | 34 (2%) | 495 (25%) | 1,928 (14%) | |
| Uppsala, N (%) | 303 (16%) | 434 (22%) | 525 (27%) | 418 (22%) | 31 (2%) | 213 (11%) | 1,924 (14%) | |
| Tartu, N (%) | 169 (13%) | 437 (34%) | 199 (16%) | 175 (14%) | 6 (1%) | 273 (22%) | 1259 (9%) | |
| Pets at birth | 3,241 (24%) | |||||||
| Yes | 172 (12%) | 551 (19%) | 466 (19%) | 629 (41%) | 89 (36%) | 1,196 (79%) | 3,103 (31%) | |
| Pets in early childhood | 2,570 (19%) | |||||||
| Yes | 779 (49%) | 1,728 (54%) | 1,535 (59%) | 1,189 (73%) | 185 (74%) | 1,391 (90%) | 6,807 (63%) |
SD, standard deviation.