Table 1

Prevalence of asthma and asthma morbidity symptoms in 1991 and 1999

Survey year
19911999% change (95% CI)p value
Wheeze in previous 12 months771/4563 (17.0%)932/4803 (19.4%)+2.51 (0.95 to 4.07)<0.01
Wheeze ever1376/4564 (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 ever811/4543 (17.9%)1428/4806 (29.7%)+11.86 (10.16 to 13.57)<0.001
Wheeze attacks 1–3/year438/4560 (9.6%)551/4766 (11.6%)+1.96 (0.71 to 3.20)<0.001
Wheeze attacks >3/year324/4560 (7.1%)353/4766 (7.4%)+0.30 (–0.75 to 1.35)NSD
Nocturnal wheeze at least once a week220/4548 (4.8%)251/4757 (5.3%)+0.44 (–0.45 to 1.33)NSD
Nocturnal cough at least once a week361/4435 (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 ever820/4523 (18.1%)1497/4809 (31.1%)+13.0 (11.27 to 14.72)<0.001
Hayfever ever554/4508 (12.3%)787/4802 (16.4%)+4.1 (2.68 to 5.2)<0.001
  • Data are shown as number/denominator (%).

  • CI = confidence interval; NSD = no significant difference.

  • 1-150 Defined by a positive answer to the question “Does your child have asthma at present?”