Summary regional and global changes in the prevalence of self-reported asthma symptoms (video questionnaire) between phase I and phase III in 13–14-year-old children: percentage change in symptom prevalence per year (and phase III symptom prevalence perentage)
| Centre | Phase I(n) | Phase III(n) | Current wheeze | Exercise wheeze | Night wheeze | Night cough | Severe wheeze |
|---|---|---|---|---|---|---|---|
| Africa | 14465 | 11467 | 0.33 (11.0) | 0.23 (14.6) | 0.16 (6.2) | 0.67 (19.7) | 0.29 (7.7) |
| Asia-Pacific | 53679 | 51196 | 0.11 (6.8) | 0.25 (10.7) | 0.02 (2.0) | 0.30 (10.4) | 0.05 (3.5) |
| Eastern Mediterranean | 6031 | 8851 | −0.05 (6.3) | 0.06 (8.8) | −0.03 (3.1) | 0.08 (8.8) | −0.04 (3.2) |
| Indian subcontinent | 12562 | 11552 | 0.32 (7.3) | 0.15 (4.8) | 0.30 (4.9) | 0.18 (4.8) | 0.00 (3.1) |
| Latin America | 18003 | 18599 | −0.04 (11.9) | −0.10 (14.2) | 0.00 (4.5) | 0.74 (20.6) | 0.01 (6.5) |
| North America | 5673 | 4895 | −0.26 (11.3) | −0.80 (18.6) | −0.11 (8.3) | 0.62 (17.7) | −0.44 (7.2) |
| Northern and Eastern Europe | 13970 | 13167 | 0.03 (2.7) | 0.15 (6.3) | 0.02 (1.6) | 0.23 (7.5) | 0.06 (1.7) |
| Oceania | 15408 | 13205 | −0.76 (11.2) | −1.64 (15.9) | −0.73 (5.1) | −0.32 (19.4) | −0.56 (7.4) |
| Western Europe | 33722 | 34581 | 0.00 (7.3) | −1.24 (13.2) | −0.18 (3.1) | 0.23 (16.0) | 0.07 (4.4) |
| Global total | 173513 | 167513 | 0.00 (7.9) | −0.21 (11.6) | −0.04 (3.4) | 0.25 (13.6) | 0.02 (4.5) |