Childhood Maltreatment and Psychosocial Flourishing among Emerging Adults: Roles of Psychological Suzhi and Self-Esteem

Studies have shown that childhood maltreatment can negatively predict psychosocial flourishing among emerging adults. However, few studies have revealed the factors that can protect the psychosocial flourishing of emerging adults who experienced maltreatment during childhood. Based on theoretical and empirical considerations, this study investigated whether and how psychological suzhi (a positive quality that can facilitate individuals’ adaptation to environment) plays a protective role in the relationship between childhood maltreatment and psychosocial flourishing among emerging adults. A total of 2863 Chinese emerging adults (Mage = 19.96 years) completed the self-report measures of the Childhood Trauma Questionnaire, Psychological Suzhi Questionnaire, Rosenberg Self-esteem Scale, and Flourishing Scale. The moderated analyses showed that childhood maltreatment had a less negative impact on psychological flourishing in high psychological suzhi emerging adults than in low psychological suzhi emerging adults. Part of the moderating effect of psychological suzhi is mediated through self-esteem. These results demonstrated that psychological suzhi plays a buffering effect between childhood maltreatment and psychosocial flourishing, and part of the effect is achieved by mediated variable self-esteem. These findings are discussed, and practical implications are presented.


Introduction
Childhood maltreatment refers to individuals' adverse experiences during childhood, including physical, sexual, and emotional abuse and neglect [1]. Recent studies have shown that childhood maltreatment can significantly reduce the well-being of emerging adults (from 18 to 29-years old) [2], such as subjective well-being [3], psychological well-being [4], social well-being [5], and psychosocial flourishing [6]. Psychosocial flourishing is a more comprehensive indicator of well-being. Flourishing individuals show self-acceptance, positive interpersonal relationships, competence, meaning, purpose in life and contribute to the well-being of others [7]. These psychosocial resources will help emerging adults solve many challenges they face in life, such as academic pressure, establishing intimate relationships, maintaining good interpersonal relationships, and employment pressure [8]. Therefore, it is necessary to reveal the factors that play a protective role in the relationship between childhood maltreatment and psychosocial flourishing among emerging adults, which previous studies have not addressed. Answering this question will have significant implications for alleviating the negative impact of childhood maltreatment on psychosocial flourishing.

Psychological Suzhi as a Moderator
Differential susceptibility theory states that some people are more susceptible to positive and negative environmental conditions than others [9]. In adverse environments (e.g., childhood maltreatment), individuals' positive characteristics are considered protective factors that can buffer the negative effect of adversity on development [10,11]. Therefore, we assumed that the effect of childhood maltreatment on psychosocial flourishing may be contingent upon the positive characteristics of individuals such as psychological suzhi.
Psychological suzhi is based on physiological conditions; it involves the internalization of externally obtained stimuli as stable, basic, and derivative psychological qualities, which are closely related to individuals' adaptation and development [12]. Psychological suzhi includes three dimensions: cognitive quality, individuality, and adaptability [13]. Cognitive qualities refer to the qualities that an individual exhibits in cognitive activities, including thinking qualities (e.g., agility, fluency, and flexibility) and metacognition. Individuality comprises the psychological characteristics that an individual exhibits in practical activities, including conscientiousness, optimism, and volition (e.g., independence and persistence). Adaptability is the notion of emotional and interpersonal skills and is flexible in different social contexts, so it governs individuals' ability to achieve harmony between themselves and the environment. Psychological suzhi is a concept that combines content elements (e.g., cognitive quality and personality) and functional elements (e.g., adaptability). Taken together, psychological suzhi reflects the positive psychological traits that facilitate students' positive adaptation to the school and social environment [14].
Zhang and Wang [15] proposed that psychological suzhi can buffer the negative effects of early adverse experiences on individuals' adaptation and development. Research has found that psychological suzhi moderates the impact of bullying victimization on children's social anxiety, that is, compared with children with high psychological suzhi, low psychological suzhi children show higher social anxiety after being bullied and victimized [16]. In another study, the negative impact of using multiple media tools on sleep quality among adolescents with low psychological suzhi was significantly greater than its impact on adolescents with high psychological suzhi [17]. Based on previous findings, this study hypothesizes that psychological suzhi may play a moderating role between childhood maltreatment and psychosocial flourishing, that is, childhood maltreatment, has a less negative impact on the psychosocial flourishing of emerging adults with high psychological suzhi than adults with low psychological suzhi.

Self-Esteem as a Mediator
If the predictive effect of childhood maltreatment on psychosocial flourishing is moderated by psychological suzhi, the next question that needs to be answered is related to how psychological suzhi works: what are the underlying mechanisms of the moderating effect of psychological suzhi? To answer this question, a mediated moderation model is proposed in this study. In this model, at least a partial moderating effect is explained by a mediator variable.
If a variable plays a mediating role in the moderating effect of psychological suzhi, two aspects of the evidence are required [18]. First, psychological suzhi can moderate the association between childhood maltreatment and this variable. Second, this variable can significantly predict psychosocial flourishing. If a variable can meet the above conditions, then it is the variable that mediates the moderating effect of psychological suzhi. According to ecological theory [19], compared with environmental variables such as childhood maltreatment, individual variables may be proximal variables affecting psychosocial flourishing. Therefore, we supposed that an individual variable might be a mediated variable.
Self-esteem, defined as a general sense of one's worth, is an important individual variable [20]. Individuals with high self-esteem have a positive attitude towards themselves and believe that they are capable and respected [20]. Self-determination theory states that competence and relatedness are basic psychological needs essential for well-being [21]. In addition, self-acceptance is an important manifestation of psychosocial flourishing [7]. Based on these theoretical considerations, high self-esteem should be a prerequisite for psychosocial flourishing. Indeed, previous studies have found that self-esteem can significantly positively predict psychosocial flourishing among adolescents [22] and emerging adults [6,23]. A longitudinal study also found that self-esteem could promote psychosocial flourishing [24].
Evidence is also needed to support the moderating role of psychological suzhi in the relationship between childhood maltreatment and self-esteem. As a positive indicator of personal development, self-esteem is the core of mental health [25,26]. The negative impact of adverse environments on individual adaptation and development can be buffered by psychological suzhi [15]. Therefore, psychological suzhi should protect the development of self-esteem when an individual experiences childhood maltreatment. Taken together, we hypothesized that the moderating effect of psychological suzhi in the association between childhood maltreatment and psychosocial flourishing may be achieved through mediated variable self-esteem. Specifically, we assumed that the self-esteem of individuals with high psychological suzhi was less damaged by childhood maltreatment than those with low psychological suzhi, and self-esteem could significantly positively predict psychosocial flourishing.

The Hypotheses of the Study
In summary, this study intends to reveal the factor that can buffer the negative effect of childhood maltreatment on psychosocial flourishing among emerging adults, and the underlying mechanism of the buffering effect. The first hypothesis is that psychological suzhi can moderate the negative effect of childhood maltreatment on psychosocial flourishing; that is, childhood maltreatment has a less negative impact on the psychosocial flourishing of emerging adults with high psychological suzhi than adults with low psychological suzhi. The second hypothesis is that self-esteem mediates part of the moderating effect of psychological suzhi (Figure 1).

Participants and Procedure
This study conducted a questionnaire survey on 2992 undergraduate students from 14 universities in eight provinces of China. A total of 2863 participants were included in data analyses (M age = 19.96 years, SD = 1.78 years; 1716 female and 1147 male). Data for 129 participants were excluded due to missing or extreme values. These participants are 4.3% of the sample, and it will have little influence on the result obtained [27]. These number of freshmen, sophomores, juniors, and seniors were 1073 (35.9%), 703 (23.5%), 548 (18.3%) and 539 (18.0%), respectively.
Participants completed a set of questionnaires by the Questionnaire Star program in quiet classrooms. The researcher explained the instructions for filling out the questionnaires to participants, and participants' names do not need to be filled in the measures to ensure data quality. All questionnaires can be completed in about 10 min. Each participant will get cash compensation after the survey is over. This study was approved by the institutional review board of Shanghai Normal university. The procedures used in this study adhere to the tenets of the Declaration of Helsinki. All participants provided oral consent.

Childhood Maltreatment
Childhood maltreatment was measured by the Childhood Trauma Questionnaire-Short Form (CTQ-SF) [1]. The CTQ-SF is a widely used instrument that measures maltreatment in childhood. The CTQ-SF contains the subscales of emotional abuse, physical abuse, and sexual abuse, emotional neglect, and physical neglect. Each subscale was assessed by five items scored on a 5-point Likert scale ranging from 1 (never) to 5 (very often). A sample item on physical abuse is as follows: "My parents hit me enough to see doctor". To measure the prevalence of each type of childhood maltreatment, the criteria used in this study were: emotional abuse ≥ 9, emotional neglect ≥ 10, physical abuse ≥ 8, physical neglect ≥ 8, and sexual abuse ≥ 6. This criterion was also used in Chinese samples by several studies [28][29][30]. This study used the validated Chinese vision of CTQ-SF [31]. In the present study, the Cronbach's alpha coefficient was 0.73 for the whole scale.

Psychological Suzhi
Psychological Suzhi was measured by the simplified version of the Psychological Suzhi Questionnaire for Undergraduate Students (PSQUS) [13]. The PSQUS contains 27 items examining three dimensions: cognitive quality (e.g., "I can think of a variety of uses for an item"), individuality (e.g., "I always feel that life is full of fun"), and adaptability (e.g., "I have clear goals and know what I should do every day"). Each dimension was assessed by nine items scored on a 5-point Likert scale ranging from 1 (totally disagree) to 5 (totally agree). In the present study, the Cronbach's alpha coefficient for the whole scale was 0.94.

Self-Esteem
Self-esteem was measured by the Rosenberg Self-esteem Scale (RSES) [20]. All 10 items were scored on a 4-point Likert scale (1 = strongly disagree; 4 = strongly agree). Sample item from RSES is "I can do things well like most people". In this study, the Cronbach's alpha coefficient was 0.91.

Psychosocial Flourishing
Psychosocial flourishing was measured by the Flourishing Scale [7]. This scale consists of eight items describing important aspects of human positive functioning as follows: positive interpersonal relationships, self-acceptance, competence, meaning and purpose in life, and contributing to the well-being of others. A Sample item from the Flourishing Scale is "I am competent in the activities that are important to me". Each item is answered on a 7-point Likert scale (1 = strongly disagree; 7 = strongly agree). In the present study, the Cronbach's alpha coefficient was 0.94.

Data Analysis
The skewness and kurtosis of psychosocial flourishing, childhood maltreatment, psychological suzhi, and self-esteem fell within the acceptable range (skewness < 2.0 and kurtosis < 7.0) [32]. What's more, the bootstrapping method was used to calculate estimators, so the normality of data distribution has little effect on it [33]. The Statistical Package for Social Sciences (SPSS) 21.0 software was used to conduct common method deviation test, descriptive statistics and correlation analysis on the data. Gender and grade differences in psychosocial flourishing were analyzed using an independent samples t-test and analysis of variance (ANOVA), respectively. Following the method of model analysis [18], SPSS PROCESS plug [34] and Bootstrap test method (5000 sampling with replacement) were adopted to estimate the parameters of three regression equations to test whether the mediated moderation holds. In each equation, all the predictors were centralized to reduce any multicollinearity [35].

Common Method Deviation Test
The Harman's single factor test was used to test for common method deviation. The result showed that the eigenvalues of 14 factors were greater than one. The explanatory variation of the most important factor was 22.5%, which is less than the critical standard of 40% [36]. Therefore, there is no obvious common method deviation in the present study.

Preliminary Analysis
The results of descriptive statistics and Pearson's bivariate correlation for all variables are shown in Table 1. In the sample of this study, the proportion of participants with an average CTQ-SF score greater than 1 (that is, subjects who experienced abuse or neglect) was 82.4%. The proportion of participants who reached the critical standard was 48.2%. The detection rate was 6% for physical abuse, 15% for emotional abuse, 27.5% for physical neglect, 21.9% for emotional neglect, and 15.4% for sexual abuse.
The ANOVA found grade effects on psychosocial flourishing, childhood maltreatment, psychological suzhi, and self-esteem, while all effect sizes are small (partial η 2 < 0.01). Therefore, these grade effects have no practical significance. Gender differences in selfesteem, psychological suzhi, and childhood maltreatment were tested to be significant, but all effect sizes are small (d < 0.2). Thus, these gender effects have no practical significance. In addition, there was no significant difference in psychosocial flourishing between boys and girls, t (2861) = 1.55, p = 0.12, d = 0.06. Therefore, grade and gender were not included as control variables in subsequent model tests.

Testing for Mediated Moderation
The parameters for three regression equations were estimated to test the mediated moderation hypothesis [18]. Regression Equation (1) was conducted by the model 1 of SPSS PROCESS plugin [34], and the regression coefficients of psychosocial flourishing on childhood maltreatment, psychological suzhi, and their interaction were estimated. Regression Equations (2) and (3) were conducted by the model 8 of SPSS PROCESS plugin [34]. The regression coefficients of self-esteem on childhood maltreatment, psychological suzhi, and their interaction were estimated in Equation (2). The regression coefficients of psychosocial flourishing on childhood maltreatment, psychological suzhi, and their interaction and self-esteem were estimated in Equation (3). The regression coefficients of the three regression equations and mediated moderation model are presented in Table 2 and Figure 2, respectively. If both of the regression coefficients of the interaction of childhood maltreatment and psychological suzhi in Equations (1) and (2) are significant, and the predictive effect of self-esteem on psychosocial flourishing in Equation (3) is significant, then there is a mediated moderating effect [18]. Table 2. Testing the mediated moderation effects of childhood maltreatment on psychosocial flourishing (n = 2863).

Discussion
This study aimed to reveal the factors that play a protective role in the relationship between childhood maltreatment and psychosocial flourishing among emerging adults and to examine its potential mechanisms. Based on the theory of differential susceptibility, this study examined a mediated moderation model. In this model, we assume that psychological suzhi moderates the negative effect of childhood maltreatment on psychosocial flourishing and that self-esteem mediates the moderating effect.
Consistent with Hypothesis 1, the study results found that psychological suzhi plays a moderating role between childhood maltreatment and psychosocial flourishing. Specifically, compared with the high psychological suzhi group, the negative predictive effect of childhood maltreatment on psychosocial flourishing was stronger in the low psychological suzhi group. This result reveals that psychological suzhi can moderate the strength of the association between childhood maltreatment and psychosocial flourishing, expanding the existing research on the relationship between childhood maltreatment and well-being [3,5,6]. This finding enriches the differential susceptibility theory by revealing important individual factors (e.g., psychological suzhi) that interact with environmental factors (e.g., childhood maltreatment) in developing psychosocial flourishing among emerging adults. Consistent with our findings, previous studies have found a moderating effect of psychological suzhi. Specifically, the negative effect of school climate on alcohol use among low psychologically suzhi adolescents was significantly greater than its effect on high psychologically suzhi adolescents [17]. Compared with children with low psychological suzhi, bullying victimization has less impact on social anxiety in children with high psychological suzhi [16]. Taken together, these results suggest that psychological suzhi can weaken the risk effect of childhood maltreatment on psychosocial flourishing among emerging adults.
This research further reveals the potential mechanisms of the moderating effect of psychological suzhi. Consistent with Hypothesis 2, the results showed that psychological suzhi significantly moderated the relationship between childhood maltreatment and self-esteem, and self-esteem had a significant positive predictive effect on psychosocial flourishing. Specifically, childhood maltreatment had a less negative impact on self-esteem in high psychological suzhi emerging adults than in low psychological suzhi emerging adults. These findings demonstrate that self-esteem mediates the moderating effect of psychological suzhi on the association between childhood maltreatment and psychosocial flourishing. These findings also expand previous research that did not address how psychological suzhi protects against the risk of consequences from adverse environmental factors [16,37]. These findings are probably because high psychological suzhi emerging adults use more adaptive cognition and coping strategies (e.g., positive emotion regulation strategies) [38] when they experience maltreatment. Therefore, they can maintain a good state and have a positive self-worth evaluation, enhancing psychosocial flourishing. Indeed, studies have shown that middle school students with high psychological suzhi use more cognitive reappraisal emotion regulation strategies [39] and show higher levels of self-esteem [40]. In addition, the results found that the interaction effect between childhood maltreatment and psychological suzhi on psychosocial flourishing was significant when self-esteem was included in Equation (3), indicating that self-esteem partly accounted for the moderating effect found between childhood maltreatment and psychological suzhi. Taken together, these findings suggest that psychological suzhi can protect self-esteem and psychosocial flourishing among maltreated emerging adults, supporting the view that psychological suzhi can facilitate Chinese students' positive adaptation to the environment [12].
This study has some limitations, and recommendations are presented for future research. First, the cross-sectional design used in this study cannot infer causal relationships among the examined variables and a longitudinal study design should thus be conducted to test it. Second, all variables were measured by self-reported scales; future studies should include information from relevant others (e.g., parents, teachers, and peers) and use a wider variety of data collection methods (e.g., observations and interviews) to increase the validity of research results. Third, the sampling of this study takes undergraduate students to represent emerging adults; future research can expand the sampling scope and improve the representativeness of the sample.
Psychological suzhi was proposed within the context of Chinese quality-oriented education [12]. It is a positive psychological trait which overlaps with the concept of resilience proposed by Western psychologists [41]. Previous studies have found that both psychological suzhi and resilience can alleviate the negative impact of bullying on children's social anxiety [16]. Therefore, the protective effects of psychological suzhi found in this study should also apply to emerging adults from different cultural backgrounds. The findings of this study extend our understanding of the impact of childhood maltreatment on emerging adults' psychosocial flourishing, which has significant implications for prevention efforts. Specifically, enhancing psychological suzhi should focus on preventive interventions to mitigate the negative impact of childhood maltreatment on psychosocial flourishing among emerging adults. Zhang and colleagues have developed some effective training models and implementation strategies to enhance psychological suzhi, including specific problem-oriented training models, subject infiltration, computer-assisted training models, home-school cooperation, and aesthetic edification [42]. The results also suggest that treatments designed to cultivate self-esteem may also be promising for enhancing psychosocial flourishing. Studies have shown that mindfulness positively affects self-esteem [43,44]. Mindfulness saves individuals from negative beliefs or critical feelings that represent low self-esteem [45,46]. Therefore, meditation or mindfulness training that increases the level of mindfulness will be beneficial for individuals' self-esteem.

Conclusions
In conclusion, this study examined the role of psychological suzhi and self-esteem in the relationship between childhood maltreatment and psychosocial flourishing among emerging Chinese adults. Psychological suzhi can buffer the negative impact of childhood maltreatment on psychosocial flourishing; that is, compared with high psychological suzhi emerging adults, childhood maltreatment is more likely to damage psychosocial flourishing in low psychological suzhi emerging adults. Self-esteem partly mediates the moderating effect between childhood maltreatment and psychological suzhi. These findings have important implications for prevention efforts to alleviate the negative effects of childhood maltreatment on psychosocial flourishing.  Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.

Data Availability Statement:
The data of the present study supporting the conclusions will be made available on request by the corresponding authors.

Conflicts of Interest:
The authors declare that they have no conflicts of interest.