Measures
Participants were asked to complete demographic details and information about their anaphylaxis. These data were also extracted from their clinical records and cross-checked with the self-report data. Severity of anaphylaxis was rated by the allergy research nurse using the Brown grading system20. Participants completed four validated scales to assess QoL and mental health. These were the World Health Organisation Quality of Life Scale, Brief version (WHOQoL BREF)21 to measure generic QoL, the Anaphylaxis Quality of Life Scale for adults (A-QoL-Adults)12 to measure anaphylaxis specific QoL, the Hospital Anxiety and Depression Scale (HADS)22 to measure anxiety and depression and the Perceived Stress Scale (PSS)23 to measure stress. All scales have excellent reliability and validity. Further details of each scale can be found in the online supplement (S1).