INZICHT, validation of the Utrecht Symptom Diary - four dimensional

The validation of the USD-4D is performed in multiple studies 1) What do patients need to use the USD-4D in daily care Qualitative data from individual interviews with 13 patients 2) What do healthcare professionals need to work with the USD4D in daily care Quantitative data from a 49-item survey completed by 122 healthcare professionals 3) Content validity of the USD-4D from the patient perspective Qualitative data from interviews with 12 patients 4) Content validity of the USD-4D from the health care professional perspective Quantitative data from a survey completed by 601 healthcare professionals 5) Construct validity of the USD-4D using hypotheses testing Quantitative data were used from two cohorts of patients with life limiting illness.