Fig. 3From: Evaluating the psychometric properties of the fatigue severity scale using item response theoryResults for the synchronous effects model. Note. N = 125. MFI: Multidimensional Fatigue Inventory, FSS: Fatigue Severity Scale, PHQ-9: Patient Health Questionnaire, t1: Time 1, t2: Time 2. *** p < .001Back to article page