Table 1.
Characteristics of study population.
| Characteristic | 0-4 years (n = 556 872) | 5-11 years (n = 882 787) | 12-15 years (n = 401 044) | 16-18 years (n = 276 740) | All (n = 2 117 443) |
|---|---|---|---|---|---|
| Male sex | 286 370 (51·4) | 453 893 (51·4) | 206 299 (51·4) | 142 333 (51·4) | 1 088 895 (51·4) |
| Maternal smoking during pregnancy | 17 491 (4·4) | 49 634 (6·1) | 28 482 (7·9) | 26 632 (10·3) | 122 239 (6·6) |
| Siblings, mean (SD) | 1·1 (1·1) | 1·5 (1·0) | 1·4 (1·1) | 1·0 (1·1) | 1·3 (1·1) |
| Highest parental education | |||||
| Primary school (9 years) | 31 739 (5·8) | 36 252 (4·1) | 11 562 (2·9) | 7 845 (2·8) | 87 398 (4·2) |
| Secondary school (12 years) | 177 524 (32·4) | 281 647 (32·1) | 136 820 (34·2) | 104473 (37·8) | 700 464 (33·3) |
| Tertiary education (>12 years) | 338 810 (61·8) | 559 769 (63·8) | 251 369 (62·9) | 163 767 (59·3) | 1 313 715 (62·5) |
| Parental region of birth | |||||
| Both parents born in Sweden | 347 345 (62·4) | 606 312 (68·7) | 298 997 (74·6) | 212 806 (76·9) | 1 465 460 (69·2) |
| One parent born in Sweden | 82 615 (14·8) | 123 740 (14·0) | 50 495 (12·6) | 32 572 (11·8) | 289 422 (13·7) |
| Both parents born abroad | 126 912 (22·8) | 152 735 (17·3) | 51 552 (12·9) | 31 362 (11·3) | 362 561 (17·1) |
| Comorbidities | |||||
| Asthma | 6 033 (1·1) | 98 436 (11·2) | 53 172 (13·3) | 37 155 (13·4) | 194 796 (9·2) |
| Autoimmune disease | 409 (0·1) | 7 120 (0·8) | 8 830 (2·2) | 10 444 (3·8) | 26 803 (1·3) |
| Chromosomal anomalies | 751 (0·1) | 2 409 (0·3) | 1 295 (0·3) | 906 (0·3) | 5 361 (0·3) |
| Chronic lung disease | 2 815 (0·5) | 5 245 (0·6) | 1 765 (0·4) | 1 219 (0·4) | 11 044 (0·5) |
| Chronic heart disease | 11 168 (2·0) | 22 281 (2·5) | 9 717 (2·4) | 6 305 (2·3) | 49 471 (2·3) |
| Life-limiting condition | 5 876 (1·1) | 19 014 (2·2) | 11 025 (2·8) | 8 510 (3·1) | 44 425 (2·1) |
| Obesity | 611 (0·1) | 15 643 (1·8) | 13 040 (3·3) | 9 347 (3·4) | 38 641 (1·8) |
Number presented as n (column %) if not otherwise specified.