Table 1 Descriptive statistics
3–6 grade pupils | 7–9 grade pupils | |||
|---|---|---|---|---|
(n = 8775) | (n = 3410) | |||
n | % | n | % | |
Age (years) | Mean = 10.7, SD = 1.22 | Mean = 14.2, SD = 0.95 | ||
7–8 (3–6 grade) / 13 (7–9 grade) | 35 | 0.40 | 989 | 29.0 |
9–10 (3–6 grade) / 14 (7–9 grade) | 4079 | 46.5 | 1083 | 31.8 |
11–12 (3–6 grade) / 15 (7–9 grade) | 4182 | 47.7 | 1085 | 31.8 |
13–14 (3–6 grade) / 16–17 (7–9 grade) | 479 | 2.5 | 253 | 7.4 |
Female sex | 4523 | 51.5 | 1786 | 52.4 |
Asthma | 530 | 6.0 | 211 | 6.2 |
Hay fever | 1122 | 12.8 | 754 | 22.1 |
Atopic rash | 852 | 9.7 | 427 | 12.5 |
Smoking | 2271 | 25.9 | 934 | 27.4 |
Attending Swedish-speaking school | 865 | 9.9 | 595 | 17.5 |
Symptomsa | ||||
Respiratory | 1861 (619) | 21.2 (7.1) | 583 (245) | 17.1 (7.2) |
Lower respiratory | 212 (82) | 2.4 (0.9) | 320 (77) | 9.4 (2.3) |
Eye | 627 (376) | 7.2 (4.3) | 569 (280) | 16.7 (8.2) |
Skin | 743 (339) | 8.5 (3.9) | 207 (56) | 6.1 (1.6) |
General | 1800 (1070) | 20.5 (12.2) | 1974 (1012) | 57.9 (29.7) |