Mindfulness' effects on stress, coping, and mood: A daily diary goodness-of-fit study.

Dispositional mindfulness is often linked to higher positive affect and lower negative affect, and coping with stress has been hypothesized to mediate these links. However, few studies have explicitly tested the ways in which stress appraisals, coping strategies, or coping flexibility (i.e., fit of coping to controllability appraisals) uniquely relate to mindfulness and well-being. Drawing on a stress and coping framework, the present study tested the degree to which (a) lower stress appraisals mediate mindfulness' effects on daily positive and negative affect; (b) daily coping mediates mindfulness' impact on daily positive and negative affect, above and beyond the effects of stress appraisals; and (c) coping flexibility mediates mindfulness' impact on positive and negative affect, above and beyond the effects of stress appraisals and average daily coping. Participants were 157 undergraduate students (mean age = 17.81; 79% women), completing daily diary questionnaires regarding stress appraisals, coping, and affect for 1 week. Results demonstrate that lower average stress appraisals mediated 19% of mindfulness' effects on negative affect; further, average use of some "mindful" emotion-focused coping strategies (i.e., non-self-blame and acceptance) independently mediated 3%-13% of mindfulness' effects on positive and negative affect. Although mindfulness was associated with greater "fit" of problem-focused versus acceptance coping to high controllability appraisals, coping flexibility did not appear to mediate mindfulness' effects on either positive or negative affect. Thus, mindfulness-based stress management interventions may be most effective by promoting mindful coping to complement, rather than replace, problem-focused coping.