Participation and prevalence of symptoms by centre
| Country and centre | Participation rhinitis questionnaire | Prevalence of symptoms in the past year | Participation skin-prick test | |||
| Children n | Participation rate | Rhinitis with conjunctivitis | Rhinitis without conjunctivitis | Children n | Participation rate | |
| Albania | ||||||
| Tirana# | 1045 | 94.3 | 6.7 | 14.6 | 929 | 84.0 |
| Brazil | ||||||
| Uruguaiana# | 1971 | 96.3 | 21.0 | 9.9 | 1192 | 96.2 |
| China | ||||||
| Beijing# | 4207 | 92.3 | 7.5 | 23.2 | 1044 | 90.8 |
| Guangzhou# | 3502 | 93.1 | 7.0 | 29.1 | 1078 | 36.1 |
| Hong Kong | 3010 | 96.7 | 12.4 | 15.2 | 1324 | 63.8 |
| Ecuador | ||||||
| Pichincha province# | 894 | 100.0 | 1.5 | 2.7 | 894 | 99.9 |
| Estonia | ||||||
| Tallinn# | 966 | 83.4 | 5.6 | 11.4 | 642 | 55.5 |
| France¶ | ||||||
| Créteil | 1373 | 64.8 | 14.6 | 15.4 | ||
| Georgia | ||||||
| Tbilisi# | 951 | 82.7 | 7.0 | 9.6 | 173 | 75.9 |
| Germany | ||||||
| Dresden | 3013 | 82.5 | 12.1 | 9.9 | 2259 | 61.6 |
| Munich | 3271 | 86.7 | 12.8 | 8.3 | 2317 | 60.6 |
| Ghana | ||||||
| Kintampo# | 1354 | ND | ND | ND | 1322 | ND |
| Greece | ||||||
| Athens | 985 | 85.3 | 4.8 | 12.9 | 985 | 85.3 |
| Thessaloniki | 1018 | 63.0 | 7.1 | 12.7 | 1018 | 63.0 |
| Iceland | ||||||
| Reykjavik | 935 | 46.5 | 11.2 | 6.3 | 633 | 38.0 |
| India | ||||||
| Bombay# | 1656 | ND | 4.9 | 5.3 | 1556 | ND |
| Italy | ||||||
| Rome | 1346 | 82.9 | 9.6 | 11.5 | 1307 | 62.3 |
| Latvia | ||||||
| Riga# | 906 | 87.3 | 8.6 | 15.7 | 295 | 30.8 |
| Netherlands | ||||||
| Utrecht | 3527 | 64.4 | 9.7 | 15.3 | 1286 | 43.3 |
| New Zealand | ||||||
| Hawkes Bay | 1320 | 84.3 | 22.3 | 12.8 | 1288 | 82.2 |
| Norway | ||||||
| Tromsø | 3675 | 81.5 | 12.6 | 7.4 | 722 | 60.2 |
| Palestine | ||||||
| Ramallah# | 2293 | 84.8 | 6.9 | 10.1 | 221 | 65.0 |
| Spain | ||||||
| Almeria | 1127 | 49.9 | 24.5 | 13.4 | 1075 | 47.7 |
| Cartagena | 1402 | 53.7 | 15.4 | 9.5 | 1030 | 39.6 |
| Madrid | 964 | 35.2 | 18.7 | 13.4 | 653 | 23.9 |
| Valencia | 1349 | 40.1 | 12.6 | 10.4 | 1023 | 30.5 |
| Sweden | ||||||
| Linköping | 904 | 81.4 | 13.8 | 5.1 | 857 | 77.0 |
| Östersund | 1193 | 85.9 | 12.2 | 8.9 | 991 | 71.4 |
| Turkey | ||||||
| Ankara# | 2966 | 87.3 | 11.8 | 17.7 | 2747 | 81.0 |
| UK | ||||||
| West Sussex | 1055 | 78.5 | 16.2 | 7.4 | 898 | 66.7 |
Data are presented as %, unless otherwise stated. ND: no data available. #: centres in countries with a gross national income per capita <US$9,200 in 2001 (nonaffluent countries); ¶: the core standard allergens were not licensed in France, where allergens from Stallergènes (Antony, France) were tested in 1,451 children.