The 5-level EQ-5D version (EQ-5D-5L) was introduced by the EuroQol Group in 2009 to improve the instrument's sensitivity and to reduce ceiling effects, as compared to the EQ-5D-3L.

The descriptive system comprises five dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension has 5 levels: no problems, slight problems, moderate problems, severe problems and extreme problems. The patient is asked to indicate his/her health state by ticking the box next to the most appropriate statement in each of the five dimensions. This decision results in a 1-digit number that expresses the level selected for that dimension.

The EQ VAS records the patient's self-rated health on a vertical visual analogue scale, where the endpoints are labelled 'The best health you can imagine' and 'The worst health you can imagine'. The VAS can be used as a quantitative measure of health outcome.

A more precise measure of personal stress can be determined by using a variety of instruments that have been designed to help measure individual stress levels. The first of these is called the Perceived Stress Scale. The Perceived Stress Scale (PSS) is a classic stress assessment instrument. The tool, while originally developed in 1983, remains a popular choice for helping us understand how different situations affect our feelings and our perceived stress. The questions in this scale ask about your feelings and thoughts during the last month. In each case, you will be asked to indicate how often you felt or thought a certain way. Although some of the questions are similar, there are differences between them and you should treat each one as a separate question. The best approach is to answer fairly quickly. That is, don't try to count up the number of times you felt a particular way; rather indicate the alternative that seems like a reasonable estimate.

The Patient Health Questionnaire 9-item depression scale (PHQ-9) and 7-item Generalized Anxiety Disorder scale (GAD-7) are among the best validated and most commonly used depression and anxiety measures, respectively.20-25 They have been used in hundreds of research studies, incorporated into numerous clinical practice guidelines, and adopted by a variety of medical and mental health care practice settings. Importantly, the PHQ-9 and GAD-7 are public domain measures available in more than 80 translations, many of which can be freely downloaded at www.phqscreeners.com. This paper uses data from 3 clinical trials to examine the reliability and convergent, construct, and factor structure validity as well as sensitivity to change of the Patient Health Questionnaire Anxiety-Depression Scale (PHQ-ADS) - a 16-item scale comprising the PHQ-9 and GAD-7 - as a composite measure of depression and anxiety.

This test consists of 21 multiple-choice questions, where the subject in question who takes the test must assess on a scale of 0 to 3 the degree to which he personally identifies with the answer he has answered in it (where 0 is that you do not identify at all, being able to conclude that you do not present the symptoms on which the question is concerned; and 3 is that there is an absolute identification, for which, the subject would suffer from the symptoms). It is a test that is easy to perform, in which the subject would not spend more than 10 or 15 minutes doing it.

Test that measures the number of times you can get up and sit down in a chair in 30 seconds.