Table 1. Keyword grouping themes relevant to research questions

Theme	Research question relevance	Keywords
Discharge letter content items	Research question 1	follow (up), medication(s), drugs, investigations, tests, diagnosis(es), admission, renal, CT, results, plan, action, acronyms, blood(s), medical, appointment, clinical, information, discharge(d), hospital, GP(s)
Patients receiving discharge letters	Research question 2	Patient(s), cop(ies), communication
Discharge letters forms/types	Research question 2	Summary(ies), template, outpatient, written, handwritten, letter(s), clinic
Practitioners writing discharge letters	Research question 2	doctor(s)