Table 1
Prevalence of asthma and asthma morbidity symptoms in 1991 and 1999
| Survey year | ||||
|---|---|---|---|---|
| 1991 | 1999 | % change (95% CI) | p value | |
| Wheeze in previous 12 months | 771/4563 (17.0%) | 932/4803 (19.4%) | +2.51 (0.95 to 4.07) | <0.01 |
| Wheeze ever | 1376/4564 (30.3%) | 1720/4810 (35.8%) | +5.66 (3.76 to 7.56) | <0.001 |
| Current asthma1-150 | 466/4539 (10.3%) | 624/4800 (13.0%) | +2.73 (1.44 to 4.03) | <0.001 |
| Asthma ever | 811/4543 (17.9%) | 1428/4806 (29.7%) | +11.86 (10.16 to 13.57) | <0.001 |
| Wheeze attacks 1–3/year | 438/4560 (9.6%) | 551/4766 (11.6%) | +1.96 (0.71 to 3.20) | <0.001 |
| Wheeze attacks >3/year | 324/4560 (7.1%) | 353/4766 (7.4%) | +0.30 (–0.75 to 1.35) | NSD |
| Nocturnal wheeze at least once a week | 220/4548 (4.8%) | 251/4757 (5.3%) | +0.44 (–0.45 to 1.33) | NSD |
| Nocturnal cough at least once a week | 361/4435 (8.1%) | 392/4784 (8.2%) | +0.05 (–1.06 to 1.17) | NSD |
| Frequent exertional wheeze or cough | 174/4493 (3.9%) | 217/4901 (4.4%) | +0.55 (–0.25 to 1.36) | NSD |
| Speech limiting wheeze in last year | 136/4558 (3.0%) | 125/4749 (2.6%) | –0.4 (–1.04 to 0.30) | NSD |
| Eczema ever | 820/4523 (18.1%) | 1497/4809 (31.1%) | +13.0 (11.27 to 14.72) | <0.001 |
| Hayfever ever | 554/4508 (12.3%) | 787/4802 (16.4%) | +4.1 (2.68 to 5.2) | <0.001 |
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Data are shown as number/denominator (%).
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CI = confidence interval; NSD = no significant difference.
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↵1-150 Defined by a positive answer to the question “Does your child have asthma at present?”
