Table 2

Percentage of asthma cases attributable to atopy based on number of positive skin prick tests and specific skin prick tests

Skin prick tests2-150% Non asthmatics atopic (n =399)% Asthmatics atopic (n =315)Relative risk% of cases attributable to atopy
No. of positive tests
Specific skin prick tests
 Any positive test35.157.12.534
 Rye grass23.444.42.627
 House dust mite19.443.73.230
Aspergillus fumigatus
  • 2-150 Defined as the development of weals at least 2 mm greater than negative control.

  • Adapted from Sears et al.22