The<unk>  <unk> , originally proposed by Sonja Hunt and Stephen McKenna, is a disease specific patient-reported outcome which assesses the impact that depression has on a patient's<unk>  of<unk> . It is the most commonly used measure of<unk>  of<unk>  in clinical trials and studies of depression. The<unk>  was developed as a measure to be used in future clinical trials of anti-depressant therapy. It is a 34 item self-rated questionnaire which consists of dichotomous response questions, with the response being either True/Not True. It is scored binomially (0-1) with higher scores on the<unk>  indicating a lower<unk>  of<unk> . Several tests of construct validity and internal consistency have found the<unk>  to be a good measure of<unk>  of<unk> . __TOC__ Needs-based model == The<unk>  is built around the generally accepted assumption that one's<unk>  of<unk>  can only be assessed subjectively.<unk>  of<unk>  tends to be greatly influenced by factors such as depression, anxiety, tension or fatigue. The<unk>  is based around the needs-based model of<unk>  of<unk> . This is derived from the assumption that<unk>  of<unk>  is dependent on a person’s ability to fulfil particular human needs. The<unk>  questions centre around a number of needs that were considered crucial in order to suffice a high<unk>  of<unk> . These include but are not limited to; food, sleep, sex, safety, love, enjoyment, self-esteem and self-actualization. The<unk>  uses a two-point response system with either True or Not True. The high number of items in the questionnaire allows the detection of moderately minor changes in<unk>  of<unk> . Items on the<unk>  are given a score of 1 when the question is applicable to the respondent and 0 when it is not applicable. The items are totalled to give a score ranging from 0-34. Low scores act as an indicator towards a high<unk>  of<unk> .
Quality of Life in Depression Scale
Rating scales for depression
Hamilton Rating Scale for Depression
Impact of Event Scale - Revised 
The Mood and Feelings Questionnaire
Hospital Anxiety and Depression Scale
Holmes and Rahe stress scale
Cook-Medley hostility scale