Multidimensional daily diary of fatigue-fibromyalgia-17 items (MDF-fibro-17). part 1: development and content...

Area of Science:

• Rheumatology
• Clinical Psychology
• Psychometrics

Background:

• Fibromyalgia (FM) affects over five million Americans, characterized by chronic widespread pain.
• Fatigue is a primary, disabling symptom for many FM patients.
• Existing fatigue measures lack the comprehensiveness required by regulatory bodies like the FDA.

Purpose of the Study:

• To develop a comprehensive, multidimensional Patient Reported Outcome (PRO) measure for FM-related fatigue.
• To create a tool suitable for assessing FM fatigue in clinical trials to support product claims.

Main Methods:

• Reviewed qualitative and quantitative data from three prior studies involving FM patients in the US, Germany, and France.
• Conducted concept elicitation interviews, cognitive debriefing, and pilot testing of a preliminary item pool.
• Utilized a methodology study to explore initial psychometrics of the item pool.

Main Results:

• Identified five key domains of FM fatigue: Global Experience, Cognitive, Physical, Motivation, and Impact on Function.
• Selected 17 items from an initial pool of 23 to represent these five dimensions.
• Developed the Multidimensional Daily Diary of Fatigue-Fibromyalgia-17 (MDF-Fibro-17) PRO measure.

Conclusions:

• Qualitative and preliminary quantitative data support the multidimensional nature of FM fatigue.
• The MDF-Fibro-17 demonstrates strong content validity for assessing FM-related fatigue.
• Further quantitative evaluation of the MDF-Fibro-17's psychometric properties is reported separately.