Fig. 4

Polysensitization in children and adults. A total of a 3155 adult patients and b 2154 children were also tested for Dermatophagoides pteronyssinus: house dust mite, Bos domesticus: cockroach, Cancer pagurus: crab, Penaeus monodon: shrimp, and Blattella germanica: cockroach. The figure shows the number of allergen-positive patients. c The distance between the points represents the relative strength of correlation between them, the shorter the distance between the two points, the higher the correlation. The optimal scale analysis shows that there is a close relationship between cockroach, crab and shrimp (Cronbach’s α = 0.891)