Absolute changes in prevalence from the laboratory study between 1992–1993 and 1998–1999 for symptoms, physician diagnosis and treatment, by atopic status#
| Nonatopic | Atopic | |
| Wheezing ever | 10.4 | 9.0 |
| Wheezing in last year | 4.7 | 8.7 |
| Woken wheezing in last year | 3.5 | 6.6 |
| Woken breathless in last year | 0 | 1.5 |
| Woken with chest tightness in last year | −0.8 | 5.2 |
| Woken coughing in last year | 7.0 | 3.0 |
| Asthma attack in last year | 1.7 | 3.9 |
| Mean change in prevalence rates | 3.8 | 5.4 |
| Current asthma medication | 1.4 | 3.1 |
| Asthma ever diagnosed by doctor | 2.5 | 5.7 |
| Overall mean increase | 3.4 | 5.2 |
| Hay fever ever | 6.9 | 13.9 |
Data are presented %.
#: participant numbers, nonatopic versus atopic: 1992–1993, 471 versus 155; 1998–1999, 424 versus 191