Fig. 1

The procedure of oral food challenge tests (OFC). The dose of the baseline OFC was based on the extent of ingestion, specific IgE antibody titer, total IgE value, and the history of allergic symptoms. When the OFC was negative in step 1 or 2, the next step OFC was promptly performed. Conversely, the OFC was stepped down depending on the results of the first step 2 or 3 OFC. Preparation of foods used for the challenge is shown in Table 1