The BFI is a brief, easy-to-administer questionnaire that typically takes less than 5 minutes to complete. It consists of nine items, including a series of numerical rating scales from 0 to 10. Patients rate their fatigue at its worst, least, average, and current levels over the past 24 hours. Additionally, they assess the impact of fatigue on various aspects of their life, such as general activity, mood, walking ability, normal work, relations with others, and enjoyment of life.
