A total of 199 adults with FM ( mean age 46.1 years , 95 % women ) who were enrolled in a randomized clinical trial wore a hip-mounted accelerometer for 1 week and completed self-report measures of physical function ( Fibromyalgia Impact Questionnaire-Physical Impairment [ FIQ-PI ] , Short Form 36 [ SF-36 ] health survey physical component score [ PCS ] , pain intensity and interference ( Brief Pain Inventory [ BPI ] ) , and depressive symptoms ( Patient Health Questionnaire-8 [ PHQ-8 ] ) as part of their baseline and followup assessments .