The mediating role of psychological capital between post-traumatic growth and uncertainty in illness among patients with Parkinson's disease

With the application of positive psychology in health management, many studies have confirmed the close relationship between post-traumatic growth, psychological capital and uncertainty in illness. However, there is still a lack of attention to the positive psychology of patients with Parkinson's disease, and previous studies have not clarify the specific relationship. Therefore, the present study sought to explore the multiple mediating roles of psychological capital between post-traumatic growth and uncertainty in illness among patients with Parkinson's disease. We conducted a cross-sectional survey, a total of 268 patients with Parkinson's disease were investigated by the Post-Traumatic Growth Inventory, the Positive Psychological Capital Questionnaire and the Mishel Uncertainty in Illness Scale - Adults from November 2021 to June 2022 in the Parkinson's specialist outpatient department of three 3a-grade hospitals in Tianjin, China. The results showed that the score of post-traumatic growth was (51.78±17.872), the score of uncertainty in illness was (68.08±17.555), and the score of self-efficacy, resilience, hope, and optimism dimensions of psychological capital were (28.93±10.511), (28.79±11.553), (27.57±8.558) and (25.35±9.768). Post-traumatic growth was negatively correlated with uncertainty in illness and positively correlated with all four dimensions of psychological capital (p < 0.01), and uncertainty in illness was negatively correlated with all four dimensions of psychological capital (p < 0.01). Bootstrap test showed that the direct effect of post-traumatic growth on uncertainty in illness of patients with Parkinson's disease was not significant; the total indirect effect of psychological capital between post-traumatic growth and uncertainty in illness was significant. The mediating effects of resilience and hope were significant, accounting for 53.07% and 19.41% of the total indirect effects, respectively. Based on the research results, psychological capital played a completely mediating role between post-traumatic growth and uncertainty in illness of patients with Parkinson's disease. Post-traumatic growth affected uncertainty in illness through two dimensions: resilience and hope. Healthcare professionals should pay attention to the level of psychological capital of patients with Parkinson's disease and implement targeted positive psychological interventions focusing on the two dimensions of resilience and hope, to enhance post-traumatic growth and reduce the level of uncertainty in illness.