Table 1

Percentage of asthma cases attributable to atopy (defined as at least one positive skin prick test) in population based studies

  • 1-150 Estimated.

  • 1-151 West Germany.

  • 1-152 East Germany.

  • 1-153 Atopy definition based on skin prick index (no. of positive reactions × size of weals).

  • 1-154 Prospective study, age at end of follow up.

  • All studies are based on a source population of at least 600 subjects but some prevalence case-control studies involve smaller numbers of cases and controls.