Total | 15 243 (100.0) | 425 (100.0) | 15 668 (100.0) |
Age | | | |
<30 years | 5320 (34.9) | 93 (21.9) | 5413 (34.6) |
30–38 years | 5041 (33.1) | 138 (32.5) | 5179 (33.1) |
≥38 years | 4879 (32.0) | 194 (45.6) | 5073 (32.4) |
Age years | 33.7 (27.6–39.9) | 37.2 (30.9–42.1) | 33.8 (27.6–40.0) |
Age at follow-up years | 43.1 (37.0–49.0) | 46.3 (40.6–51.2) | 43.2 (37.1–49.1) |
Sex | | | |
Males | 7413 (48.6) | 247 (58.1) | 7660 (48.9) |
Females | 7830 (51.4) | 178 (41.9) | 8008 (51.1) |
Asthma | | | |
No | 13 301 (87.6) | 192 (45.7) | 13 493 (86.4) |
Early onset¶ | 796 (5.2) | 110 (26.2) | 906 (5.8) |
Late onset+ | 1092 (7.2) | 118 (28.1) | 1210 (7.8) |
Smoking | | | |
Never | 6454 (43.0) | 127 (30.7) | 6581 (42.7) |
Former | 3114 (20.7) | 73 (17.6) | 3187 (20.7) |
Current | | | |
0–10 pack-years | 2382 (15.9) | 49 (11.8) | 2431 (15.8) |
10–20 pack-years | 1634 (10.9) | 57 (13.8) | 1691 (11.0) |
>20 pack-years | 1426 (9.5) | 108 (26.1) | 1534 (9.9) |
Atopy§ | 4532 (33.8) | 206 (54.6) | 4738 (34.3) |
Age on completing education | | | |
>22 years | 3741 (26.3) | 86 (22.5) | 3827 (26.2) |
18–22 years | 4366 (30.7) | 83 (21.7) | 4449 (30.5) |
≤18 years | 6105 (43.0) | 214 (55.9) | 6319 (43.3) |
Childhood factors | | | |
Maternal asthma | 1013 (6.9) | 49 (12.2) | 1062 (7.0) |
Paternal asthma | 896 (6.3) | 72 (18.4) | 968 (6.6) |
Paternal atopy | 2086 (15.2) | 76 (20.2) | 2162 (15.3) |
Maternal atopy | 3049 (21.5) | 76 (19.8) | 3125 (21.5) |
Infection <5 years of age | 1554 (10.9) | 82 (21.4) | 1636 (11.1) |
Maternal smoking | 3822 (25.4) | 129 (31.4) | 3951 (25.6) |
Country | | | |
Australia | 715 (4.7) | 42 (9.9) | 757 (4.8) |
Belgium | 787 (5.2) | 22 (5.2) | 809 (5.2) |
Estonia | 476 (3.1) | 9 (2.1) | 485 (3.1) |
France | 2076 (13.6) | 40 (9.4) | 2116 (13.5) |
Germany | 1673 (11.0) | 28 (6.6) | 1701 (10.9) |
Iceland | 592 (3.9) | 17 (4.0) | 609 (3.9) |
Italy | 897 (5.9) | 13 (3.1) | 910 (5.8) |
The Netherlands | 387 (2.5) | 4 (0.9) | 391 (2.5) |
Norway | 751 (4.9) | 22 (5.2) | 773 (4.9) |
Spain | 2105 (13.8) | 69 (16.2) | 2174 (13.9) |
Sweden | 2057 (13.5) | 37 (8.7) | 2094 (13.4) |
Switzerland | 907 (6.0) | 38 (8.9) | 945 (6.0) |
UK | 1380 (9.1) | 76 (17.9) | 1456 (9.3) |
USA | 440 (2.9) | 8 (1.9) | 448 (2.9) |
Participation in ECRHS | | | |
Only ECRHS I | 7044 (46.2) | 171 (40.2) | 7215 (46.0) |
Both ECRHS I and II | 8199 (53.8) | 254 (59.8) | 8453 (54.0) |