Figure 1.

Variables significantly linked to a positive CA-test (A) When CA-positive and CA-negative patients were compared, the former were more often female and had a higher rate of reactions triggered by cold ambient air or immersion in cold water, a higher rate of reactions aggravated by increased humidity levels in the summer, and a higher frequency of angioedema triggered by ingestion of cold foods or drinks. (B) When CA-positive and CA-negative patients were compared, the former also had lower UCT scores, lower erythrocyte counts, lower hemoglobin concentrations, higher thrombocyte counts, and lower monocyte counts. CA, cold agglutinin; UCT, Urticaria Control Test.