Statistics
Statistical analysis was performed using IBM SPSS Statistics 25 (Chicago, IL, USA).
Basic frequency distributions were used to describe different characteristics: demographic data, atopic history, co-factors, symptoms, severity and timing of reactions, pre-hospital and medically administered care, long-term management. Mann-Whitney U test was used for comparison between the 2 subgroups; a p value <0.05 was considered to be statistically significant.