The present investigation examined the incremental predictive validity of mindfulness-based processes, indexed by the Kentucky Inventory of Mindfulness Skills, in relation to posttraumatic stress symptom severity among individuals without any axis I psychopathology. Participants included 239 adults who endorsed exposure to traumatic life events. Results indicated that the Accepting without Judgment subscale was significantly incrementally associated with posttraumatic stress symptoms; effects were above and beyond the variance accounted for by negative affectivity and number of trauma types experienced. The Acting with Awareness subscale was incrementally associated with only posttraumatic stress-relevant re-experiencing symptoms; and no other mindfulness factors were related to the dependent measures. Findings are discussed in relation to extant empirical and theoretical work relevant to mindfulness and posttraumatic stress. Keywords mindfulness; acceptance; trauma; posttraumatic stress Recent proliferation of mindfulness and acceptance-based treatments has underscored importance of advancing more basic knowledge about the clinically-relevant mechanisms underlying associations between mindfulness and acceptance and various psychological symptoms (Eifert & Forsyth, 2005;Hayes, Strosahl, & Wilson, 1999;Kabat-Zinn, Lipworth, Burney, & Sellers, 1987;Linehan, 1993;Parks, Anderson & Marlatt, 2001;Walser & Westrup, 2007). However, despite promise of mindfulness for improved psychological functioning, there is a lack of consensus on an overarching theoretical Correspondence concerning this article should be addressed to Michael J. Zvolensky, Ph.D. Dr. Zvolensky can be contacted at The University of Vermont, Department of Psychology, 2 Colchester Avenue, John Dewey Hall, Burlington,; electronic mail may be sent to Michael.Zvolensky@uvm.edu. Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
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NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript framework, and by extension, operationalization of the construct (Bishop et al., 2004;Zvolensky, Feldner, Leen-Feldner, & Yartz, 2005). Bishop et al. (2004) offer one promising two-component definition, whereby mindfulness is defined as (1) self-regulation of attention on the internal and external events in the present moment, and (2) maintenance of an acceptance-based stance toward one's present experience.Without a universally accepted definition of the construct, each mindfulness-based treatment has defined and indexed the construct and corresponding approach to skills training slightly differe...