Table 4.

Age and sex standardised prevalences (numbers of participants) of asthma (“asthma” and “asthma and/or wheeze”) in never smokers by hay fever status, and prevalence ratios in 1996 compared with 1972-6

Asthma definition1972-6 (n=540)1996 (n=495)Prevalence ratio adjusted for all covariatesP value
Asthma:
With hay fever1.3 (8)3.0 (19)2.65 (0.99 to 7.09)0.052
Without hay fever1.7 (12)5.2 (23)2.43 (1.13 to 5.19)0.023
All3.0 (20)8.2 (42)2.60 (1.41 to 4.80)0.002
Asthma and/or wheeze:
With hay fever1.4 (9)3.2 (20)2.52 (1.01 to 6.28)0.048
Without hay fever5.0 (28)5.3 (24)1.00 (0.53 to 1.90)0.996
All6.4 (37)8.5 (44)1.40 (0.83 to 2.36)0.203
  • Standardisation for age differences means that percentages differ from estimates based on raw numerators and denominators.