... analysisAn individual analysis was made of each of the ques-tionnaires, taking into account their original correctingrule s, along with a reliability study of the correspondingscales and, where applicable, ... othercomorbidities, and the utilization of health care andnon-health care resour ces, laboral status and a stimatedcost of the fibromyalgia impact during the year before.An eva luation was also made of patient ... maximum validity and reliability of the results obtained, and constitutes a safe startingpoint for examining the usefulness of the tool. On the other hand, the tool includes the main evaluativedomains...