Table 1.
Prevalence of asthma symptoms and atopic sensitisation in schoolchildren from three cities in China
|
Hong Kong (n=3110)
|
Beijing (n=4227)
|
Guangzhou (n=3565)
|
||||
|---|---|---|---|---|---|---|
| Characteristic | No of children | Prevalence (95% CI) | No of children | Prevalence (95% CI) | No of children | Prevalence (95% CI) |
| Mean (SD) age (years) | 10.3 (0.7) | 10.4 (0.6) | 10.1 (0.4) | |||
| No (%) boys | 1648 (52.9) | 2156 (51.0) | 1783 (50.0) | |||
| Symptoms in past year: | ||||||
| Wheeze: | 179 | 5.8 (4.9 to 6.6) | 159 | 3.8 (3.2 to 4.3) | 121 | 3.4 (2.8 to 4.0) |
| ≥4 attacks | 40 | 1.3 (0.9 to 1.7) | 33 | 0.8 (0.5 to 1.1) | 18 | 0.5 (0.3 to 0.7) |
| Speech limiting | 54 | 1.7 (1.3 to 2.2) | 20 | 0.5 (0.3 to 0.7) | 16 | 0.4 (0.2 to 0.7) |
| Exercise induced | 239 | 7.7 (6.7 to 8.6) | 193 | 4.6 (3.9 to 5.2) | 109 | 3.1 (2.5 to 3.6) |
| Current asthma | 104 | 3.3 (2.7 to 4.0) | 98 | 2.3 (1.9 to 2.8) | 75 | 2.1 (1.6 to 2.6) |
| Skin prick test*: | n=1341 | n=1044 | n=1098 | |||
| Atopic† | 552 | 41.2 (38.5 to 43.8) | 249 | 23.9 (21.3 to 26.4) | 337 | 30.8 (28.1 to 33.5) |
| Dermatophagoides pteronysinnus | 457 | 34.1 (31.5 to 36.6) | 78 | 7.5 (5.9 to 9.1) | 219 | 20.0 (17.6 to 22.4) |
| Dermatophagoides farinae | 347 | 25.9 (23.5 to 28.2) | 59 | 5.7 (4.3 to 7.1) | 196 | 17.9 (15.6 to 20.2) |
| Cat | 50 | 3.7 (2.7 to 4.7) | 58 | 5.6 (4.2 to 6.9) | 47 | 4.3 (3.1 to 5.5) |
| Cockroach | 154 | 11.5 (9.8 to 13.2) | 139 | 13.3 (11.3 to 15.4) | 186 | 17.0 (14.8 to 19.2) |
*
Sensitivities <3% not shown.
†
One or more positive test results.