Bryce B. Reeve|Angela M. Stover|Catherine M. Alfano|Ashley Wilder Smith|Rachel Ballard?Barbash|Leslie Bernstein|Anne McTiernan|Kathy B. Baumgartner|Barbara F. Piper
The Piper Fatigue Scale-12 (PFS-12): psychometric findings and item reduction in a cohort of breast cancer survivors
University of North Carolina at Chapel Hill|University of North Carolina at Chapel Hill|National Coalition for Cancer Survivorship|National Cancer Institute|National Cancer Institute|National Cancer Institute|City of Hope|Fred Hutch Cancer Center|University of Louisville|University of Arizona
brief valid measures fatigue prevalent distressing cancer symptom needed use research studys primary aim create shortened version revised piper fatigue scale pfsr based data diverse cohort breast cancer survivors secondary aim determine whether pfs captured multiple distinct aspects fatigue multidimensional model single overall fatigue factor unidimensional model breast cancer survivors n 799 stages situ iiia ages 2986 years recruited three seer registries new mexico western washington los angeles ca part health eating activity lifestyle heal study fatigue measured approximately 3 years postdiagnosis using 22item pfsr four subscales behavior affect sensory cognition confirmatory factor analysis used compare unidimensional multidimensional models six criteria used make item selections shorten pfsr scales content validity items relationship fatigue content redundancy differential item functioning race andor education scale reliability literacy demand factor analyses supported original 4factor structure also evidence bifactor model dominant underlying fatigue factor six items tested positive differential item functioning africanamerican caucasian survivors four additional items either showed poor association local dependence content validity concerns removing 10 items reliability pfs12 subscales ranged 087 089 compared 090094 prior item removal newly developed pfs12 used assess fatigue africanamerican caucasian breast cancer survivors reduces response burden without compromising reliability validity first study determine pfs literacy demand compare pfsr responses africanamericans caucasian breast cancer survivors testing diverse populations warranted