Abstract
ObjectivesTo explore which modifiable lifestyle behaviors contribute to illness intrusiveness in persons with multiple sclerosis (MS). DesignCohort study. SettingCommunity-based comprehensive MS center. ParticipantsAdults with MS (N=154) who completed an online battery of self-report questionnaires. InterventionsNot applicable. Main Outcome MeasuresIllness intrusiveness was measured with the 13-item Illness Intrusiveness Ratings Scale. Lifestyle behaviors were measured using the respective components of the Simple Lifestyle Indicator Questionnaire (ie, Diet, Physical Activity, Alcohol, Smoking, and Life Stress) and self-reported body mass index (BMI). ResultsAfter controlling for age, race, sex, disease duration, and level of physical disability (“disability”), life stress was associated with greater illness intrusiveness (b=4.65, P<.001), and physical activity was associated with less illness intrusiveness (b=-0.67, P=.009). Exploratory mediation analyses revealed physical activity had an indirect effect on illness intrusiveness through disability (b=-0.39, 95% CI: -0.68, -0.16). Conversely, disability also displayed an indirect effect on illness intrusiveness through physical activity (b=0.57, 95% CI: 0.12, 1.16). ConclusionsLife stress and physical activity are 2 modifiable lifestyle behaviors that contribute to illness intrusiveness, with the latter also having an indirect effect through disability. These findings may help inform future behavioral interventions for improving health-related quality of life in persons with MS.
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