Abstract
OBJECTIVES: To examine the construct validity of the International FItness Scale (IFIS) (ie, self-reported fitness) against objectively measured physical fitness in women with fibromyalgia and in healthy women; and to study the test-retest reliability of the IFIS in women with fibromyalgia. DESIGN: Cross-sectional study. SETTING: Fibromyalgia patient support groups. PARTICIPANTS:
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