**2.2 The questionnaire**

The questionnaire used in the study is the VSP-A (Vécu et Santé Perçue de l'Adolescent), it is a self-administered French indicator of health-related quality of life that has been developed from the perspective of healthy and sick adolescents aged 11–17.

For adolescents, nine areas were explored:


Each response was rated from 1 to 5. The points were distributed as follows: 1 point for the answer that corresponded to "ill-being," 5 points for "well-being" with all the intermediate nuances. The "no answer" and "unconcerned" questions were not included in the questionnaire administered to adolescents and therefore do not correspond to any rating.

The questions corresponding to the same field were distributed throughout the questionnaire in order to limit the response bias. The questions were in the form of multiple choice answers. Five responses were received possible: never, not at all/rarely, a little/sometimes, moderately/often, much /always, and a lot.

In the questionnaires given to "parents," in addition to the previous items, a sixth proposal appeared: not concerned.
