[Information and Counseling needs Regarding Parenthood Decisions: Are Existing Services Sufficient and what Role does Depression Play?] / Informations- und Beratungsbedarf bei Elternschaftsentscheidungen: Genügen bestehende Angebote und welche Rolle spielen Depressionen?

OBJECTIVE: Support needs in parenting decisions and the associated desire for information and counseling services are insufficiently researched, especially in relation to groups of people with mental health burdens. The aim of this study was to assess information and counseling needs in parenting decisions. In addition, we investigated whether more severe depressive symptomatology is associated with increased needs. METHODS: A sample of 187 individuals between the ages of 20 and 44 was surveyed in an online study. RESULTS: Not having enough information on the topic was expressed by 45% of participants, and the desire for information related to multiple topics. A larger offer of professional coun-seling was desired by 65% of the participants, 74% (rather) did not know where to get it. Existing counseling services were used infrequently in relation to needs and with predominantly moderate satisfaction. Greater depressive symptomatology was not associated with increased information or counseling needs. DISCUSSION AND CONCLUSION: Findings suggest an expansion of support services on parenting decisions. Further research into the needs of different groups and barriers to using existing services is essential.

Measuring Change in Attachment Insecurity Using Short Forms of the ECR-R: Longitudinal Measurement Invariance and Sensitivity to Treatment.

Attachment insecurity is important for psychotherapy both as an aspect influencing the therapeutic process as well as potential outcome variable of a treatment. Two German short forms of the Experiences in Close Relationships - Revised (ECR-R) have been proposed to assess individual differences in attachment anxiety and avoidance. In this research, we examined whether these questionnaires are suitable for measuring change in attachment anxiety and avoidance by testing longitudinal measurement invariance in two independent clinical samples (N1 = 493, N2 = 273) using a pre-post design. Results indicated that strict longitudinal measurement invariance can be assumed for both measures. Thus, changes in scale scores before and after treatment can be interpreted as changes in the latent dimensions of attachment anxiety and avoidance. Both questionnaires were also sensitive to treatment in that attachment insecurity was overall reduced after therapy. Although both measures appear to be generally suitable for investigating treatment effects, they exhibited consistent problems with structural validity across samples that should be reexamined in future research.

Measuring personality functioning with the 12-item version of the OPD-Structure Questionnaire (OPD-SQS): reliability, factor structure, validity, and measurement invariance in the general population.

Background: The assessment of personality functioning is at the core of current dimensional models of personality disorders. A variety of measures from different clinical and research traditions aim to assess basic psychological capacities regarding the self and others. While some instruments have shown reliability and validity in clinical or other selected samples, much less is known about their performance in the general population. Methods: In three samples representative of the German adult population with a total of 7,256 participants, levels of personality functioning were measured with the short 12-item version of the Operationalized Psychodynamic Diagnosis - Structure Questionnaire (OPD-SQS). We addressed questions of factor structure, reliability, validity, factorial invariance, and provide norm values. Results: Confirmatory factor analysis indicated a satisfactory to good model fit. OPD-SQS models were mostly unaffected by variables such as gender, age, or measurement time. As expected, personality functioning was associated with general psychopathology as well as indices of occupational functioning. Conclusion: The OPD-SQS is a viable measure to assess personality functioning in the general population.

Periodontal maintenance: individual patient responses and discontinuations.

AIM: There is a lack of data on long-term impact of different psychological variables on periodontitis. Aim of the current study was to investigate the impact of psychological factors in patients with chronic periodontitis (CP; according to the 1999 Classification of Periodontal Diseases) to explain adherence to or discontinuation of supportive periodontal therapy (SPT) in a university setting. METHODS: A sample of n = 119 patients were examined in a questionnaire-based, cross-sectional survey. All patients had received active periodontal treatment (APT) and were reevaluated in a university setting (Kiel) before 2016 [T1: start SPT]. Patients who showed sufficient adherence to SPT of ≥ 2 years (maximum ± 6 months of deviation between SPT intervals, last visit and questionnaire at T2) were assigned to the adherence group (AG: n = 58), or, if they interrupted SPT or stopped treatment altogether, to the non-adherence group (NAG: n = 61). In addition to dental parameters, we assessed socio-demographic, treatment-related (critical attitudes/complaints), dental as well as psychological variables (especially psychological attachment, but also dental fear, patient participation style, personality functioning) and examined between-group differences as well as possible mediating factors of non-adherence to treatment continuation. RESULTS: For both groups we found similar average observation time (NAG/AG: 15.9(8.9)/14.9(10.6)years). There were significant differences in age, critical attitudes, dental fear, and patient participation style between the groups. With the help of exploratory sequential mediation models, we found a significant indirect pathway of the impact of attachment anxiety on discontinuation of treatment mediated through dental fear and number of critical attitudes/complaints. CONCLUSION: Considering the limitations, dentists should be aware of personality-related risk-factors such as attachment anxiety as well as their interplay with levels of dental fear and critical attitudes which may influence adherence to SPT. TRIAL REGISTRATION: The clinical trial was retrospectively registered in the DRKS-German Clinical Trials Register ( https://www.drks.de ) with registration DRKS00030092 (26/08/2022).

The Relationship Between Patients' Personality Traits, the Alliance, and Change in Interpersonal Distress in Intensive Group Treatment for Personality Dysfunction.

This study examined patients' personality traits as operationalized by the five-factor model in relation to early alliance and reduction of interpersonal distress through an intensive group treatment program for personality dysfunction. A sample of 79 consecutively admitted psychiatric outpatients with personality dysfunction who attended an 18-week intensive group treatment program completed the NEO Five-Factor Inventory at pretreatment, the Inventory of Interpersonal Problems at pre- and posttreatment, and the Edmonton Therapeutic Alliance Scale, a measure of the therapeutic alliance with the program therapist, at Session 5. Results indicated that patients who were relatively extraverted tended to rate the alliance with their program therapist higher and subsequently reported more improvement of interpersonal distress. The presence of a personality disorder did not moderate this mediation. Patients' extraversion likely promotes a bonding with the therapist and facilitates the interpersonal group work necessary for improvement. Assessing patients' level of extraversion before starting intensive group treatment might indicate which intervention strategies could be useful with that patient within the program frame.

Associations Between Personality Functioning, Childhood Trauma and Non-adherence in Cardiovascular Disease: A Psychodynamically-Informed Cross-Sectional Study.

Objective: Although treatment adherence and lifestyle changes significantly improve the prognosis of cardiovascular disease, many patients do not comply with clinician recommendations. Personality functioning appears to be of importance and is hypothesized to be superior to symptom-based measures in explaining individual differences in non-adherence. Methods: 194 cardiology inpatients (mean age = 70.6 years, 60% male) were assessed using self-report measures in a cross-sectional design. Patients were assessed using the short version of the Operationalized Psychodynamic Diagnosis Structure Questionnaire (OPD-SQS) to measure personality functioning, as well as the Childhood Trauma Screener (CTS), the Patient Health Questionnaire (PHQ-9) for symptoms of depression, and the Generalized Anxiety Disorder Scale-7 (GAD-7). To assess non-adherence we introduced a brief, novel scale. Results: Non-adherence correlated significant with personality functioning (r = 0.325), childhood trauma (r = 0.204) and depressiveness (r = 0.225). In a stepwise multiple regression analysis with socio-demographic variables inputted into the model, higher deficits in personality functioning, higher levels of childhood trauma, and male gender were associated with non-adherence (adjusted R2 = 0.149, F (3,190) = 12.225, p < 0.01). Level of depressive symptoms, anxiety, age, education, and income showed no significant additional predictive value and were excluded from the model. Conclusion: In cardiovascular disease, personality functioning, childhood trauma and male gender are associated with non-adherence and appear to be more important than symptom reports of depression and anxiety. This highlights the relevance of basic impairments in intra- and interpersonal functioning in chronic disease, where the patient's adherence is central.

Eating disorder psychopathology: The role of attachment anxiety, attachment avoidance, and personality functioning.

OBJECTIVE: Although the relationship between insecure attachment patterns and eating disorder (ED) psychopathology has repeatedly been demonstrated, the underlying mechanisms of this association are not fully understood. Therefore, the current study aimed to examine personality functioning, defined as an impairment in self and interpersonal functioning, as a mediator between attachment insecurity and ED psychopathology. METHODS: In a representative population-based sample (N = 2508; age range 14-92 years) ED symptomatology, personality functioning, and attachment insecurity (anxiety and avoidance) were assessed. Besides descriptive uni-/bivariate analysis, path analysis was used to test a mediation model while controlling for the effects of age, gender, mental distress, and BMI. RESULTS: ED symptomatology was associated with lower levels of personality functioning (r = 0.22) and higher levels of attachment anxiety (r = 0.14) but did not correlate with attachment avoidance (r = 0.02). Path analysis revealed that personality functioning fully mediated the effect of attachment anxiety on ED symptomatology: The indirect effect via personality functioning (ß = 0.04, p < .001) accounted for 77% of the total effect. Fit indices were excellent. Sensitivity analyses revealed that the main results were mainly applicable to women and the middle age group. CONCLUSION: The present findings contribute to the growing body of research using dimensional conceptualizations of personality functioning, suggesting that it provides an informative, overarching framework for understanding and treating ED psychopathology. Findings indicate that underlying individual differences, e.g., with respect to insecure attachment configurations, have relevant implications for symptom manifestations. Potential clinical implications and avenues for future research are discussed.

Does clinically relevant psychopathology in adolescents necessarily require treatment or does it "grow out"?

OBJECTIVE: To determine the treatment effect of psychodynamic therapy for adolescents in comparison to normative developmental progression in two groups without treatment: healthy adolescents and adolescents with juvenile diabetes. RESEARCH DESIGN AND METHODS: In a 3-wave longitudinal study, n = 531 adolescents (n = 303 treated adolescents, n = 119 healthy, n = 109 with diabetes) and their parents filled out psychopathology questionnaires (Youth Self-Report [YSR] and Child Behaviour Checklist [CBCL]). Growth curve modeling (GCM) was used to examine within-person change in psychopathology while controlling for stable between-person differences. RESULTS: GCM analyses revealed significant within-person reductions in patients' YSR and CBCL (d = 1.02-1.99) at the end of treatment. When accounted for the control groups' developmental progression (d = .14-.94), patients' within-person change remained significantly higher (d = .48-.82). In all three groups, parents rated the severity of psychopathology significantly lower, and within-person change significantly higher than the adolescents him/herself. CONCLUSIONS: Psychodynamic therapy led to a significant symptom reduction in treated adolescents and was superior to development-related symptom changes occurring in the two control groups. Hence, clinically relevant symptoms in adolescents do not "grow out", but require psychotherapeutic treatment. Differences between adolescents and their parents in the evaluation of symptom severity and change require attention in psychotherapy treatment and research.

Structural impairment and conflict load as vulnerability factors for burnout - A cross-sectional study from the German working population.

Introduction: Individual vulnerability and resilience factors are increasingly studied in burnout research. This is especially true for clinical variables that translate directly into intervention programs from a psychodynamic perspective. For example, few studies have examined the relationship between structural impairment and the individual spectrum of motivational conflicts according to the Operationalized Psychodynamic Diagnosis system (OPD) in relation to burnout. To substantiate previous findings, we hypothesized that structural impairment as well as motivational conflicts are related to burnout, but that structural impairment explained additional variance and mediated a possible relationship between conflicts and burnout. Method: The present cross-sectional study was carried out on a sample of the German working population (N = 545). Questionnaires were used to measure structural impairment (OPD-SQS), the conflict-modes along with the category K0 (OPD-CQ), as well as burnout (BOSS-I/-II). Results: Structural impairment, a number of conflict modes, and burnout were significantly associated. Moreover, structural impairment explained additional variance in burnout. The requirements for the conflict-specific mediation models were given for 9 of the 12 OPD conflict modes. In these models the impact of the conflict modes on burnout was mediated by structural impairment. Discussion: The current study broadens the comprehension of the relations between structural impairment, the conflict modes and burnout. In addition it higlights the role of structural impairment in predicting burnout risk and possible prevention approaches.

Defense Mechanisms and Repressive Coping Among Male Breast Cancer Patients.

Objectives: The concept of defense mechanisms has undergone extensive revision and expansion since Freud first described these processes. Initially formulated as an unconscious repression of unpleasant memories, with further development focusing on the role of defense mechanisms in the regulation of internal conflicts, the concept shifted and evolved to incorporate the adaptation to external demands, including intrapsychic and interpersonal handling of burden of illness. In addition to defense mechanisms, coping provides another perspective on human adjustment to difficult life events. While there is substantial research on both coping and defense mechanisms in various psychiatric and somatic diseases, including cancer, little is known about defensive regulation, coping, and their interaction in male breast cancer patients. Methods: The present study is part of the N-Male project conducted between 2016 and 2018 in Germany (Male breast cancer: patients' needs in prevention, diagnosis, treatment, rehabilitation, and follow-up care). Semi-standardized interviews with 27 male breast cancer patients were analyzed with regard to defense mechanisms. In addition, fear of progression and repressive coping was assessed by self-report. Results: There was considerable variety in levels of defensive functioning as well as repressive coping in our sample. We found no difference in overall levels of defensive functioning between men with vs. without repressive coping. However, patients with repressive coping demonstrated a decopupled association between fear of progression and defensive functioning as compared to patients without repressive coping. Discussion: The study provides the first evidence of disease processing in male breast cancer patients Knowledge of patients' defense patterns and repressive coping seems promising for better planning targeted intervention strategies.

Evaluation of a short version of the Experiences in Close Relationships-Revised questionnaire (ECR-RD8): results from a representative German sample.

BACKGROUND: Attachment insecurity is a prominent risk factor for the development and course of psychiatric and psychosomatic disorders. The Experiences in Close Relationships - Revised (ECR-R) questionnaire is a widely used self-report to assess attachment related anxiety and avoidance. However, its length has the potential to restrict its use in large, multi-instrument studies. The aim of this study was to develop and evaluate a brief version of the ECR-R, and provide norm values for the German population. METHODS: A screening version of the original ECR-R was developed through principal components analysis of datasets from several previous studies. In a representative sample of 2428 randomly selected individuals from the German population, we compared fit indices of different models by means of confirmatory factor analyses (CFA). We investigated the convergent validity of the screening version in an independent convenience sample of 557 participants. Correlations between the short and the full scale were investigated in a re-analysis of the original German ECR-R evaluation sample. RESULTS: CFA indicated a satisfactory model fit for an eight-item version (ECR-RD8). The ECR-RD8 demonstrated adequate reliability. The subscales correlated as expected with another self-report measure of attachment in an independent sample. Individuals with higher levels of attachment anxiety, but especially higher levels of attachment avoidance were significantly more likely to not be in a relationship, across all age groups. Correlations between the short and the full scale were high. CONCLUSIONS: The ECR-RD8 appears to be a reliable, valid, and economic questionnaire for assessing attachment insecurity. In addition, the reported population-based norm values will help to contextualize future research findings.

Assessing Psychodynamic Conflicts and Level of Personality Functioning in Women Diagnosed With Vaginismus and Dyspareunia.

Knowledge on etiological and risk factors of genito-pelvic pain/penetration disorder, formerly classified as dyspareunia and vaginismus, is limited. The Operationalized Psychodynamic Diagnosis (OPD) system offers a valuable basis for developmental considerations, and has not yet been used to research sexual pain difficulties in women. We conducted an exploratory pilot study of psychodynamic motivational conflicts and level of personality functioning as defined by the OPD system by means of an anonymous online survey among 24 women who had been diagnosed with dyspareunia or vaginismus. We matched them with 24 healthy controls and compared groups using paired-samples t-tests and Wilcoxon tests. Effect sizes were calculated using Pearson's r. Large effect sizes were found for mean or median differences of several OPD Structure Questionnaire (OPD-SQ) scales (self-reflection, p = 0.002/r = 0.59; affect differentiation, p = 0.007/r = 0.53; self-perception, p = 0.002/r = 0.58; impulse control, p = 0.007/r = 0.53; self-worth regulation, p = 0.008/r = 0.52; self-regulation, p = 0.004/r = 0.56; experiencing affect, p = 0.009/r = 0.53; bodily self, p = 0.008/r = 0.54; OPD-SQ total score, p = 0.007/r = 0.52; internal communication, p = 0.001/r = 0.63) and OPD Conflict Questionnaire (OPD-CQ) scales (guilt conflict active, p = 0.004/r = 0.60; Oedipal conflict passive, p = 0.009/r = 0.51; individuation versus dependency conflict active, p = 0.01/r = 0.52; guilt conflict passive, p < 0.001/r = 0.70; self-worth conflict passive, p = 0.001/r = 0.70; passive mode, p < 0.001/r = 0.68). The problems with personality functioning and more pronounced types of conflicts participants displayed suggest proneness for self-invalidation, internalization and restricted self-perception.

Personality functioning as a mediator of adult mental health following child maltreatment.

BACKGROUND: The broad range of adverse health outcomes following child maltreatment (child maltreatment) underscores the need to investigate shared trajectories that contribute to associated physical and mental health problems. Previous research focused on different mechanisms, such as emotion regulation or attachment. In the present study, we propose personality functioning, comprising self- and interpersonal regulation and perception, to mediate between child maltreatment and mental and physical health. METHODS: In a German representative sample (N = 2,508), we assessed remembered child maltreatment, levels of personality functioning, and different health outcomes in adulthood, namely somatic symptoms, general mental distress, and body dysmorphic concern. We conducted path analyses to investigate mediation effects in the total sample as well as in female and male subsamples. RESULTS: Child maltreatment significantly predicted the assessed health outcomes and showed significant associations with lower levels of personality functioning. Personality functioning partially mediated all health outcomes assessed by significant indirect effects and lowered direct effects of child maltreatment on health outcomes. An exploratory analysis of different facets of personality functioning revealed a pronounced impact of identity perception and self-reflective capacities in mediating between child maltreatment and physical and mental health. Comparable results were found in female and male participants. LIMITATIONS: Major limitations of the study are the reliance on cross-sectional data and the use of a screening measure to assess experienced child maltreatment. CONCLUSION: Personality functioning may represent a transdiagnostic link to different somatic and psychological symptoms in the aftermath of child maltreatment.

Intraindividual dynamics between alliance and symptom severity in long-term psychotherapy: Why time matters.

Objective: The association between alliance and therapy outcome is one of the most investigated factors in psychotherapy research. However, even studies using advanced methods estimate effects over a specific time period (interval) between measurement occasions. Thus, it remains unknown how the magnitude and direction of effects depend on the considered time interval, resulting in limited comparability across studies. The current study examines the influence of time on the within-person relationship between alliance and symptom severity. Method: Alliance (WAI-SR) and symptom severity (SCL-K11) were assessed every fifth session in N = 650 patients receiving up to 100 weekly sessions (mode = 55; M = 41.03; SD = 27.23) of individual psychotherapy in a German outpatient clinic. Bivariate continuous-time (CT) structural equation modeling (SEM) was used to estimate within-person cross- and auto-effects. Results: Analysis revealed significant reciprocal within-person cross-effects with stronger relative effects of SCL-K11 on WAI-SR (a21) than vice versa (a12). CT analysis showed that both cross-lagged effects increased for longer time intervals with strongest effects for time intervals of about 40 sessions (a21 = -.47; a12 = -.19). Conclusions: Alliance and symptom severity showed a reciprocal relationship. Expanding current evidence, our analysis showed how the magnitude of these effects depends on the considered time interval. Applying CT-SEM on longitudinal data of the alliance outcome association complements current cross-lagged panel analysis and allows to compare results of studies which are based on different time intervals between measurement occasions. Methodological, theoretical, and clinical implications are discussed. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Different Dimensions of Affective Processing in Patients With Irritable Bowel Syndrome: A Multi-Center Cross-Sectional Study.

Objective: Deficits in affective processing are associated with impairments in both mental and physical health. The role of affective processing in patients with functional somatic complaints such as irritable bowel syndrome (IBS) remains unclear. Most studies have focused on the capacity for emotional awareness and expression, but neglect other dimensions of affective processing. Therefore, this study aimed to systematically analyze differences in six different dimensions of affective processing between patients with IBS and healthy controls (HCs). Additionally, we exploratively investigated the impact of IBS symptom severity, psychological distress, and attachment styles on affective processing in IBS. Methods: A controlled cross-sectional multi-center study was conducted. Overall, 127 patients with IBS were compared with 127 matched HCs using multivariate analysis of variances. Affective processing was operationalized in line with the affect cascade model on six specific dimensions: emotional experience, emotional awareness, affect tolerance, affect differentiation, affect regulation, and emotional communication. They were measured using two subscales of the Mentalizing Questionnaire (MZQ) and four subscales of the Operationalized Psychodynamic Diagnosis-Structure Questionnaire (OPD-SQ). Linear regression analysis was used to investigate the influence of IBS symptom severity (IBS-Severity Scoring System, IBS-SSS), depression (Patient Health Questionnaire, PHQ-9), anxiety (General Anxiety Disorder, GAD-7), and anxious and avoidant attachment styles (Experiences in Close Relationships Scale, ECR-RD12) on the different dimensions of affective processing in IBS. Results: Patients with IBS compared to HCs showed deficits in all six dimensions of affective processing. Deficits were largest for affect tolerance (d = 0.849) and lowest for emotional experience (d = 0.222) and emotional awareness (d = 0.420). Moderate effect sizes were found for affect differentiation (d = 0.773), emotional communication (d = 0.665), and affect regulation (d = 0.552). Moreover, explorative analyses indicated that affective processing in patients with IBS was significantly influenced by levels of anxiety and insecure attachment. Conclusion: The results indicate a specific pattern of affective processing abilities in patients with IBS. The deficits in affective processing are more prominent in the area of understanding and tolerating difficult affective states than experiencing affective states. This opens interesting perspectives for the development of specific psychotherapeutic interventions. Clinical Trial Registration: DRKS00011685.

The impact of psychological attachment on the relationship between periodontal health and dental fear in patients with versus without psoriasis: a questionnaire-based, cross-sectional study.

BACKGROUND: While there is increasing evidence for the relevance of psychosocial variables such as dental fear or psychological attachment in dentistry, much less is known about the mechanisms that determine the strength of those associations. One potential moderator is the occurrence of a comorbid chronic disease such as psoriasis, which is linked to relevant disease parameters such as periodontal inflammation. The aim of the study was to test a moderation model of the relationship between dental fear, psychological attachment and psoriasis on periodontal health. METHODS: A total of 201 patients (100 with psoriasis, 101 without psoriasis) were included in a questionnaire-based, cross-sectional study. Dental status was measured with the Community Periodontal Index (CPI), dental fear was measured with the Hierarchical Anxiety Questionnaire (HAQ), and psychological attachment was measured with the Relationship Questionnaire (RQ). In addition to the examination of main effects, bootstrapping-based analyses were conducted to test the moderating influence of psychological attachment on the association between CPI and dental fear, gain moderated by group (with vs. without psoriasis). RESULTS: Controlling for several covariates, higher CPI scores were associated with higher levels of dental fear only in individuals without psoriasis under conditions of higher levels of psychological attachment anxiety and lower levels of attachment avoidance. CONCLUSION: In individuals without psoriasis, psychological attachment can moderate the association between periodontal health and dental fear. This may provide a useful framework for reducing dental fear through interventions on the level of the dentist-patient relationship.

The Validity of Somatic Symptom Disorder in Patients With Gastrointestinal Complaints.

BACKGROUND AND GOAL: The current diagnostic concept of somatic symptom disorder (SSD) aims to capture psychological burden due to bodily complaints independent of the medical cause. The aim of this study was to compare patients with chronic gastrointestinal (GI) complaints with SSD (SSD+) and without SSD (SSD-) along sociodemographic, clinical, and psychological characteristics. STUDY: This cross-sectional study included 199 patients (n=92 SSD+ and n=107 SSD-) with distressing and chronic abdominal/lower GI complaints (≥6 mo) recruited from several primary, secondary, and tertiary medical care units. SSD+ patients were separated from SSD- patients by psychobehavioral positive criteria. Psychological distress (somatization, depression, anxiety, and illness anxiety) and risk factors (adverse childhood experiences, insecure attachment, mentalizing capacity, and levels of personality functioning) were measured. Nonparametric group comparisons were performed to analyze the differences of sociodemographic, clinical, and psychological characteristics between SSD+ and SSD- patients. RESULTS: About half of the SSD+ patients had a functional GI disorder and a third had an inflammatory bowel disease. SSD+ patients reported higher GI pain severity, higher health-related and work-related impairment, and higher psychological distress, especially illness anxiety, as well as higher mentalizing and personality functioning deficits. CONCLUSIONS: Overall, psychobehavioral positive criteria of SSD seem to be a valid identifier of patients exhibiting a high psychological burden, independent of the medical explanation of the GI complaints. There is a substantial overlap of SSD and general mental burden, but also evidence for a specific disease entity.

Applying Item Response Theory to the OPD Structure Questionnaire: Identification of a Unidimensional Core Construct and Feasibility of Computer Adaptive Testing.

Recent developments in the dimensional assessment of personality functioning have made the implementation of latent measurement models increasingly attractive. In this study, we applied item response theory (IRT) to a well-established personality functioning instrument (the OPD Structure Questionnaire) to identify a unidimensional latent trait and to evaluate the feasibility of computer adaptive testing (CAT). We hypothesized that the use of IRT could reduce the test burden - compared to a fixed short form - while maintaining high precision over a wide range of the latent trait. The OPD-SQ was collected from 1235 patients in a psychosomatic clinic. IRT assumptions were fulfilled. A 9-factor model yielded sufficient fit and unidimensionality in exploratory factor analysis with bifactor rotation. Items were iteratively reduced, and a graded-response IRT model was fitted to the data. Simulations showed that a CAT with approximately 7 items was able to capture an OPD-SQ global severity score with an accuracy similar to that of a fixed 12-item short form. The final item bank and CAT yielded satisfactory content validity. Strong correlations with depression and anxiety replicated previous results on the OPD-SQ. We concluded that IRT applications could be useful to reduce the test burden of personality functioning instruments.