Diabetes mellitus (DM) is a chronic noncommunicable disease with widespread prevalence[1]. In recent years, the prevalence of diabetes has increased dramatically with the change in lifestyle[2]. It has become a public health problem of wide concern and poses a threat to global health problems[3]. With a long course of diabetes and many complications, the disease is complicated, and the recovery is poor, which makes the patients suffer from long-term psychological pressure, thus affecting the quality of life of the patients[4]. Relevant research results show that their quality of life of diabetes patients is generally low, and the prolongation of diabetes is associated with a decline in quality of life[5]. Therefore, the study on the quality of life of diabetes patients is particularly important.
Quality of life (QoL) is a concept that comprehensively evaluates the merits of life and represents an individual's view of how well functioning is physically, psychologically, and socially[6]. QoL is a significant health outcome in its own right, representing the ultimate goal of all health interventions[7]. QoL is measured by physical and social functioning and perceived physical and mental health[8]. Studies have shown that the QoL of people with diabetes is reduced compared to those without diabetes[9]. Maintaining the QoL of people with diabetes is a decisive outcome variable for diabetes treatment[10]. It should be used as an essential quality indicator to evaluate the efficacy and effectiveness of therapeutic measures.
Up to now, QoL's relevant factors and influencing mechanisms have yet to be made clear. However, previous studies on the internal mechanism of quality of life have shown that one of the influencing factors is psychological resilience(PR)[11]. As an individual's ability to actively cope with difficult situations, PR can help individuals maintain a relatively stable physiological and psychological level in an unfavorable environment[12]. Individuals with higher levels of PR have been reported to have stronger positive social orientation abilities, can positively participate in social activities, and have a higher QoL than patients with the same disease[13, 14].
1.1.The Mediating Role of Stigma
The potential mechanism of PR on QoL needs to be further explored, and stigma may play a mediating role in it. Stigma refers to negative emotional experiences such as negative self-cognition, self-blame, and self-depreciation caused by patients being discriminated against, excluded, and alienated by the public due to a certain disease[15]. Diabetes is usually stereotyped and considered to be caused by poor eating habits and lifestyles, which can easily lead to negative psychology, such as stigma[16, 17]. At the same time, studies had shown that stigma affects the level of PR and QoL of individuals and has a negative impact on the construction of individual PR and QoL[18]. Stigma itself has a negative connotation and is closely related to the patient's negative emotions[19]. In the face of adversity or stressful events, diabetes with high levels of PR can accept the disease with a good attitude, actively face negative emotions, and have a lighter degree of stigma, which is conducive to the improvement of QoL[20]. Conversely, patients with low levels of PR tend to respond to difficulties in an avoidant manner, which increases the burden of disease and stigma and leads to a decline in QoL. Therefore, hypothesis 1 was proposed that PR had a direct predictive effect on the quality of life, and stigma partially mediated the relationship.
1.2. The Moderating Role of Empowerment
Psychological resilience's direct and indirect effects on QoL may also be moderated by other variables, such as empowerment[21]. Empowerment refers to the process by which patients gain the necessary knowledge and self-awareness to influence their and others' behavior to improve their QoL[22]. Patient empowerment interventions can improve the capabilities of patients, giving them greater control over their disease-related parameters and lifestyle[23, 24]. Empowerment boosts confidence, awareness, and decision-making skills for physical and mental health and healthcare[25]. However, most diabetes patients have a reduced level of PR due to a lack of disease knowledge, poor glycemic control, and increased disease burden, which is not conducive to improving stigma[26]. Therefore, hypothesis 2 proposed that empowerment has a moderating effect on the relationship between PR and stigma. Studies had shown that empowerment education interventions could effectively improve glycemic control, blood glucose levels, and QoL in people with diabetes[27]. Diabetes has many complications and poor recovery, and long-term drug treatment causes irreversible functional damage to the kidneys and other organs, which would aggravate the patient's experience of stigma and lead to a decline in QoL[28]. Therefore, to improve patients' enthusiasm for treatment, alleviate clinical symptoms, and thus improve their QoL, it is necessary to carry out empowerment education for patients[29]. Therefore, hypothesis 3 proposed that empowerment also moderates the relationship between stigma and QoL.
1.3.The present study
To further explore the relationship between PR, stigma, empowerment, and QoL, this study proposed a moderate mediation model to study the relationship between PR and QoL in patients with diabetes. This study proposed the following hypotheses :(H1) the mediating role of stigma between PR and QoL; (H2) Empowerment moderates the first half of "PR→ stigma → QoL"; (H3) Empowerment moderates the latter part of "PR→ stigma → QoL."