Consenting participants (relatives) will be approached after inclusion of the patient and asked to estimate their own health related quality of life (HRQOL) 2 weeks prior to the time point for patient ICU admission through a HRQOL questionnaire. This self-reported HRQOL data will be used as proxy for baseline data. Three months after ICU discharge, relatives to ICU survivors will receive the following questionnaires by postal mail; Caregiver Burden Index, HRQOL questionnaire, a questionnaire screening for symptoms of anxiety and depression and a questionnaire screening for symptoms of posttraumatic stress.