An Explanatory Model of Health Promotion and Quality of Life in Chronic Disabling Conditions

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Abstract
Although previous studies have examined selected factors influencing health-promoting behaviors or quality of life, the complex interplay of these variables in persons with chronic disabling conditions has not been investigated. To test an explanatory model of variables influencing health promotion and quality of life (Stuifbergen & Rogers, 1997) in persons living with the chronic disabling condition of multiple sclerosis (MS). A sample of 786 persons with MS (630 women and 156 men) completed a battery of instruments measuring severity of illness-related impairment, barriers to health-promoting behaviors, resources, self-efficacy, acceptance, health-promoting behaviors, and perceived quality of life. The proposed model was assessed and modified using the weighted least squares procedure (WLS), which is implemented by LISREL8 (Joreskog & Sorbom, 1993). The initial model was modified to obtain a recursive model with adequate fit, χ2 (8, N = 786) = 77, p < 0.05; GFI = 0.96; IFI = 0.98; CFI = 0.98. The antecedent variables accounted for 58% of the variance in the frequency of health-promoting behaviors and 66% of the variance in perceived quality of life. The effects of severity of illness on quality of life were mediated partially by health-promoting behaviors, resources, barriers, self-efficacy and acceptance. The final model supports the hypothesis that quality of life is the outcome of a complex interplay among contextual factors (severity of illness), antecedent variables (Stuifbergen & Rogers, 1997), and health-promoting behaviors. The strength of direct and indirect paths suggests that interventions to enhance social support, decrease barriers, and increase specific self-efficacy for health behaviors would result in improved health-promoting behaviors and quality of life. Further research using a longitudinal design is needed to clarify the effects of the interaction between health-promoting behaviors and trajectory of illness on quality of life for persons with chronic disabling conditions.

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