4.1. Differences between EMS domains and body esteem variables between the examined groups
We conducted a comparative analysis among the BPD, MD, and HC groups across the 5 domains of EMSs. In Disconnection and Rejection, Impaired Autonomy and Performance, Impaired Limits and Other-Directedness significant differences emerged among the groups under examination. The BPD group attained the highest score, followed by the MD group and finally the HC group. Regarding Overvigilance, only the psychiatric groups differed from the HC group. These findings partially corroborate prior studies indicating a positive association between elevated levels of EMSs and increased depression severity (13). Furthermore, a greater level of EMS was found in BPD patients than in HCs (42). To date, only one study has compared MD and BPD in terms of EMS, and contrary to our results, in the majority of the studies, no significant difference was found between the examined groups (27). Nevertheless, researchers obtained this result after adjusting for the level of distress. Both the previous study and our findings affirm the hypothesis that EMSs play a significant role in both mental disorders. Simultaneously, discerning any distinction between the two psychiatric groups regarding schemas undoubtedly necessitates considering numerous factors and warrants further investigation.
Regarding body esteem variables in the case of general body esteem, all the examined groups differed from each other. These findings are in line with previous findings where higher levels of body dissatisfaction and disturbed body image were found in BPD (9, 10) and MD (11, 17) patients. However, previous studies did not compare these two psychiatric disorders. The lower level of body esteem in BPD patients suggests that disturbances in identity, which are characteristic of BPD (43) and in which the body is an essential component, may have a more pronounced impact on body satisfaction than the negative self-esteem which was observed in individuals with MD (44). Significant differences in body function were found between the BPD and HC groups. Previously, no study has explored satisfaction with body functions in this context. One possible explanation is that borderline symptoms affect one's overall functioning, often including dissociative experiences (45). These symptoms might result not only in lower body esteem but also in a general perception of one's body as dysfunctional. Significant differences in head and upper body parameters were detected between the psychiatric patients and the control group. Notably, these variables have not been previously explored in psychiatric disorders. These findings suggest that dissatisfaction with these areas may be attributed to dysfunction in these specific regions, particularly the face. Consequently, our results support the notion of dysfunctional facial expression in patients with BPD (46) and MD (47) patients.
The variable others encompasses various anatomical features and characteristics that resist classification into distinct categories, thus contributing to a variable perspective concerning the entire body. These attributes include e.g. body defects, body hair, skin, and scars. The analysis of others revealed significant group disparities, particularly between the BPD group and the remaining groups. This finding suggests that individuals diagnosed with BPD may exhibit heightened sensitivity to bodily attributes such as weight or skin condition. These results are in line with previous studies in which higher body weight (48) and more severe and maladaptive eating patterns were found in BPD patients (49). Our findings are also in line with those studies in which a greater prevalence of skin-related body modifications (50) and scars (51) were found, supporting a lower level of satisfaction with these areas.
4.3. Effect of EMSs on body esteem variables in the BPD, MD and HC groups
The initial ANCOVA revealed a significant impact of Impaired Autonomy and Performance, as well as Impaired Limits, on general body esteem, alongside a significant group effect. These findings align with prior research indicating the substantial predictive value of these domains concerning body image (28). However, further examination identified the schema of Entitlement within Impaired Autonomy and Performance and the schema of Enmeshment within Impaired Limits as the contributing factors. In the post hoc analysis, within the BPD group, Enmeshment displayed a negative correlation, while within the MD group, Enmeshment exhibited a positive association with general body esteem.The relationship between general body esteem and Enmeshment in BPD suggests that although enmeshment is not typically associated with BPD symptoms (12), patients with a greater inclination toward attachment or enmeshment with another individual exhibit greater levels of dissatisfaction with their bodies, indicating a greater psychological distance from their own bodies. These findings provide an additional perspective on why patients with BPD may experience a poorer body image (10) and a diminished connection with their bodies, resulting a lower body ownership (52). Greater Entitlement was associated with better body esteem in the MD group, which is partially in line with Schwartz and Tylk’s study (53), where a positive relationship between self-assurance factor of Entitlement and body esteem was found among men. In comparison to this finding, our results indicate that an overestimation of the self and one's own rights is strongly associated with an overestimation of the body. Furthermore, it appears that these relationships are most pronounced in MD patients, possibly due to previous research identifying co-occurrences between vulnerable narcissists and depressive symptoms (54, 55)
Similar to general body esteem, initial ANCOVA revealed a significant impact of Impaired Autonomy and Performance, as well as Impaired Limits, on body function in addition to a significant group effect. Further examination identified the schema of Entitlement within Impaired Autonomy and Performance and the schema of Enmeshment within Impaired Limits as the contributing factors. According to the post hoc analysis, schema Enmeshment exhibited a significant negative correlation with body functions only within the BPD group. Currently, limited understanding exists regarding body functioning and its associated satisfaction in BPD patients. However, our findings align with prior research indicating impaired motor function and coordination in individuals with BPD (56). Given that our variable "body functions" encompass various aspects, including appetite and olfaction, in addition to motoric functioning, our results suggest the presence of nervous system impairments in BPD (57). Furthermore, these effects appear to be most pronounced in conjunction with features such as self-boundary instability and the inclination toward enmeshment with others.
ANCOVA revealed a significant effect of Impaired Autonomy on others, in addition to the effect of group. Further examination revealed that Vulnerability to Harm and Failure to Achieve were statistically significant. Post hoc analysis revealed that, in the BPD group, Vulnerability to Harm and in the MD group, Failure to Achieve exhibited significant negative associations with the dependent variable. These findings imply that within individuals diagnosed with BPD, perceptions of vulnerability are predominantly linked to discontent surrounding specific bodily characteristics such as weight, skin, or scars. Our results suggest that the fear of harm among BPD patients is associated with heightened dissatisfaction regarding weight or skin condition, potentially serving as a contributing factor to impulsive eating patterns (58), self-harming (e.g., skin scaring) behaviors (59), or body modification practices (50), all of which are typically observed in individuals with BPD. In the MD group, failure associated with the aforementioned body parts, which partially supports previous studies linking failure to achieve remission with higher weight, suggests that feelings of failure in performance are associated with feelings of failure in attaining an ideal body.
Although the upper body and head did not reveal a significant association in the post hoc analysis, the relationship with Impaired Limits of these variables highlights and strengthens the importance of this schema domain in body esteem disturbances.