Since the questionnaire relies on client self-report, all responses should be verified by the clinician, and a definitive diagnosis is made on clinical grounds taking into account how well the client understood the questionnaire, as well as other relevant information from the client.
Certain symptoms of grief have been shown (a) to be distinct from bereavement-related depression and anxiety, and (b) to predict long-term functional impairments. The authors termed these symptoms of “complicated grief” and developed the Inventory of Complicated Grief (ICG) to assess them.
Complicated grievers are respondents whose scores on the Inventory of Complicated Grief (ICG) are >25; uncomplicated grievers are respondents whose ICG scores are ≤25.