Prevalence of symptoms of asthma, rhinitis and eczema for ISAAC (2003) and GAN (2019) studies with 95% CIs
| Written questionnaire | ISAAC 2003 | GAN 2019 | Dif. | ||
| n | % (95% CI) | n | % (95% CI) | P value | |
| Asthma symptoms | |||||
| Wheeze ever | 1134 | 37.6 (35.9 to 9.4) | 303 | 12.7 (11.4 to 14.1) | <0.001 |
| Wheeze in the past 12 months | 535 | 17.8 (16.4 to 9.2) | 156 | 6.5 (5.6 to 7.6) | <0.001 |
| Four or more attacks of wheeze in the past 12 months | 76 | 2.5 (2.0 to 3.1) | 19 | 0.8 (0.4 to 1.1) | <0.001 |
| Sleep disturbance from wheeze, one or more nights a week in the past 12 months | 41 | 1.4 (1.0 to 1.8) | 16 | 0.7 (0.3 to 1.0) | 0.017 |
| Speech limited by wheeze in the past 12 months | 89 | 3 (2.4 to 3.6) | 60 | 2.5 (1.8 to 3.2) | 0.413 |
| Asthma ever | 207 | 6.9 (6.0 to 7.8) | 110 | 4.6 (3.8 to 5.4) | 0.001 |
| Wheeze during or after exercise in the past 12 months | 319 | 10.6 (9.5 to 11.7) | 440 | 18.5 (16.9 to 20.0) | <0.001 |
| Night cough in the past 12 months | 233 | 7.7 (6.8 to 8.7) | 670 | 28.2 (26.3 to 30.0) | <0.001 |
| Doctor diagnosis of asthma | 80 | 3.4 (2.6 to 4.0) | |||
| Rhinitis | |||||
| Nose symptoms ever | 1446 | 48 (46.2 to 49.7) | 1343 | 56.4 (54.4 to 58.4) | <0.001 |
| Nose symptoms in the past 12 months | 1102 | 36.6 (34.8 to 38.3) | 1091 | 45.8 (43.8 to 47.8) | <0.001 |
| Nose and eye symptoms in the past 12 months | 697 | 23.1 (21.6 to 24.6) | 664 | 27.9 (26.0 to 29.7) | <0.001 |
| Nose symptoms affecting activities a lot in the past 12 months | 26 | 0.9 (5.9 to 12.6) | 100 | 4.2 (3.3 to 5.0) | <0.001 |
| Rhinitis ever | 282 | 11.8 (10.5 to 13.1) | |||
| Doctor diagnosis of rhinitis | 203 | 8.5 (7.4 to 9.6) | |||
| Eczema | |||||
| Rash ever | 918 | 30.5 (28.8 to 32.1) | 418 | 17.6 (16.0 to 19.0) | <0.001 |
| Rash in the past 12 months | 675 | 22.4 (20.9 to 23.9) | 330 | 13.9 (12.4 to 15.2) | <0.001 |
| Flexural symptoms | 599 | 19.9 (18.5 to 21.3) | 247 | 10.4 (9.1 to 12.1) | <0.001 |
| Complete clearance of rash in the past 12 months | 356 | 11.8 (10.7 to 13.0) | 259 | 10.9 (9.6 to 12.1) | 0.448 |
| Sleep disturbance from rash, one or more nights a week in the past 12 months | 72 | 2.4 (1.9 to 3.0) | 42 | 1.8 (1.2 to 2.2) | 0.144 |
| Eczema ever | 354 | 11.7 (10.6 to 12.9) | 85 | 3.6 (2.8 to 4.3) | <0.001 |
| Doctor diagnosis of eczema | 53 | 2.2 (1.6 to 2.8) | |||
Dif, Difference; GAN, Global Asthma Network; ISAAC, International Study of Asthma and Allergies in Childhood.