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Introduction: Fatigue is one of the most common symptom reported by cancer patients. The Brief Fatigue Inventory (BFI; Mendoza, Wang, Cleeland, Morrissey, Johnson, Wendt, Huber, 1999) is a short and comprehensive instrument to assess severity of fatigue and fatigue-related impairment in cancer patients. Aim: The aim of the study was to evaluate the psychometric properties of the Polish version of the BFI, and to determine the structure of the tool and its reliability in a group of cancer patients. Ocena właściwości psychometrycznych polskiej wersji Brief Fatigue Inventory wśród chorych z rozpoznaniem nowotworu płuca The evaluation of psychometric properties of the Polish version of the Brief Fatigue Inventory among patients diagnosed with lung cancer Jolanta Życińska1, Maciej Januszek1, Magdalena Kudłacik2, Adam Pawlak2 1SWPS Uniwersytet Humanistycznospołeczny, Wydział Zamiejscowy w Katowicach 2Centrum Pulmonologii i Torakochirurgii w Bystrej Psychoonkologia 2016; 20 (2): 75–83 DOI: 10.5114/pson.2016.62133