Type 1 diabetes is associated with alexithymia in nondepressed, non-mentally ill diabetic patients: A case-control study

Objective

Alexithymia refers to difficulty in identifying and expressing emotions, and it is a characteristic common to several psychiatric and medical conditions, including autoimmune disorders. Type 1 diabetes (T1D) is an autoimmune disorder with increased psychiatric comorbidity. Previously reported associations between alexithymia and T1D may have been confounded by the presence of depression. The central aim of this study was to examine alexithymia levels in psychiatrically uncomplicated T1D outpatients with that of nondiabetic controls.

Methods

Ninety-six T1D patients without any DSM-IV Axis I diagnoses and 105 age- and sex-matched healthy controls entered the study. Alexithymia and depressive symptoms were assessed with the Toronto Alexithymia Scale (TAS-20) and the Beck Depression Inventory (BDI-21), respectively. Multivariate regression models were used to evaluate the association of alexithymia with the presence of diabetes, duration of diabetes, diabetes control, parameters of treatment intensification, and diabetic complications.

Results

T1D was positively associated with the TAS-20 “identifying feelings” (β coefficient=2.64, P=.003) and “externally oriented thinking” (β coefficient=1.73, P=.011) subscales. The prevalence of overall alexithymia (TAS-20 total score, ≥60) was 22.2% in T1D patients and 7.6% in the controls (OR, 4.6; 95% CI, 1.7-12.8). TAS-20 scores were positively associated with diabetes duration and negatively with treatment intensification parameters.

Conclusions

Alexithymia is higher in psychiatrically uncomplicated T1D patients than in healthy controls even after adjustment for confounding depressive symptoms; it is greater with longer diabetes duration and is associated with some reduced parameters of treatment intensification but not with worse outcome in terms of glycemic control or somatic complications.     

Alexithymia and pain in temporomandibular disorder

Objective

To clarify the relationship of global alexithymia and its facets with pain, assessed prospectively using experience sampling methods (ESMs), in temporomandibular disorder (TMD).

Methods

People with painful TMD (n=49), pain-free somatic controls (24 people with disk displacement), and healthy controls (n=28) completed measures of alexithymia (Toronto Alexithymia Scale-20 [TAS-20]) and depressed mood. Patients with painful TMD used ESM to record jaw pain multiple times daily for a week.

Results

The somatic and the healthy controls were equivalent on alexithymia and were combined. The painful TMD group had higher difficulty in identifying feelings but lower externally oriented thinking (EOT); only the latter effect remained after covarying depressed mood. Among patients with painful TMD, the TAS-20 total and EOT correlated positively with pain severity after controlling for depressed mood.

Conclusion

Findings highlight the complex relationships of alexithymia and its facets to TMD pain. Research should examine alexithymia facets separately and distinguish between methods that compare groups on alexithymia (e.g., pain patients versus controls) and those that correlate alexithymia with pain severity within a group.     

Validation of a Greek adaptation of the 20-item Toronto Alexithymia Scale

Background

The purpose of the current investigation was (1) to test whether the 3-factor structure of the 20-item Toronto Alexithymia Scale (TAS-20) corresponding to the theoretical conceptualization of the alexithymia construct could be recovered in a Greek translation of the scale (the TAS-20-G), (2) to assess if a 3-factor structure provides a better fit to the TAS-20-G compared with the recently proposed alternative factor structures, and (3) to evaluate the internal reliability of the TAS-20-G.

Methods

The English version of the TAS-20 was translated into Greek and then back-translated and modified until cross-language equivalence was established. The Greek version was then administered to 340 university students. Confirmatory factor analyses were conducted, and 4 different factor structure models were compared. Internal consistency and item-to-scale homogeneity of the TAS-20-G and its factor scales were also evaluated.

Results

The 3-factor model provided a good fit to the data and proved superior to alternative 1-, 2-, and 4-factor models. Apart from a coefficient α below the recommended range for the externally oriented thinking factor, the TAS-20-G and its factor scales demonstrated adequate internal consistency and homogeneity.

Conclusion

The TAS-20-G is a valid and reliable measure of alexithymia in university students and may be suitable for investigations of alexithymia in other Greek-speaking population samples.     

Parental bonding and alexithymia: A meta-analysis

Aim

The primary purpose of this meta-analysis was to explore, clarify and report the strength of the relationship between alexithymia, as measured by the Toronto Alexithymia Scale (TAS-20), and parenting style as measured by the Parental Bonding Instrument (PBI).

Methods

Web of Science, PsycInfo, PubMed and ProQuest: Dissertations and Theses searches were undertaken, yielding nine samples with sufficient data to be included in the meta-analysis.

Results

Evidence indicated moderate to strong relationships between maternal care and alexithymia, and between maternal care and two of the three TAS-20 alexithymia facets (Difficulties Describing Feelings and Difficulties Identifying Feelings, but not Externally Oriented Thinking). Moderate relationships were observed for both maternal- and paternal-overprotection and alexithymia respectively, and for overprotection (both maternal and paternal) and Difficulties Describing Feelings.

Conclusion

This study is the first meta-analysis of the relationship between parenting styles and alexithymia, and findings confirm an especially strong association between maternal care and key elements of alexithymia. This review highlights the issues that still remain to be addressed in exploring the link between parenting style and alexithymia.     

Effects of inpatient psychotherapy on the stability of alexithymia characteristics

Background

Although alexithymia is associated with several psychiatric disorders, there has been little research into the effects of psychodynamic psychotherapies on this condition. Here, the influence of inpatient multimodal psychodynamic psychotherapy on alexithymia and symptom load was evaluated in a large sample of patients.

Methods

Alexithymia [measured with the Toronto Alexithymia Scale (TAS)-26] and psychological stress and depression [measured with the Symptom Checklist 90 Revised (SCL-90-R)] were evaluated at admission and after inpatient multimodal psychotherapy in patients with various psychosomatic and psychiatric disorders admitted to this unit between 2002 and 2005. Patients undergoing both short-term (up to 4 weeks) and long-term treatment (8-12 weeks) were studied. Analyses of covariance were used to analyse the data on depression (SCL-90-R) and psychological stress (SCL-90-R), and correlations between admission and discharge scores for the TAS-26 were computed to evaluate mean and relative stability of alexithymia.

Results

Data on 397 of the 568 patients admitted were analysed. Psychological stress and depression (SCL-90-R) decreased significantly during the study across all diagnostic groups. The TAS-26 total score also decreased significantly, showing that there was no mean stability of alexithymic characteristics. However, the significance of decrease was lost when psychological stress and depression were controlled for. Highly significant correlations between TAS-26 sores before and after treatment reflected high relative stability of alexithymia.

Conclusions

During inpatient multimodal psychodynamic treatment, the symptom load and alexithymia in our patients decreased. The high relative stability of alexithymia shown supports the view that alexithymia is a relative stable personality trait.     

Alexithymia, hypertension, and subclinical atherosclerosis in the general population

Objectives

As a personality trait, alexithymia is assumed to present a longstanding risk factor for emotional dysregulation that also affects the autonomic nervous system. Therefore, we hypothesize that alexithymia is associated with hypertension and carotid atherosclerosis in the general population.

Methods

A total of 1168 subjects (age <65 years) from the Study of Health in Pomerania (SHIP) were eligible for complete case analyses. Alexithymia was assessed with the 20-item Toronto-Alexithymia-Scale (TAS-20). An extensive interview and physical examination were performed. Extracranial carotid arteries were examined bilaterally with B-mode ultrasonography. Regression models were adjusted for sociodemographic factors and classical risk factors for cardiovascular diseases and mental distress.

Results

In the adjusted logistic regression models, alexithymia was significantly associated with hypertension (OR=1.60; 95% CI=1.14-2.25) and with atherosclerotic plaques (OR=1.70; 95% CI=1.14-2.54). Hypertension changed the effect of alexithymia on atherosclerosis only marginally (OR=1.76 to 1.70).

Conclusion

Alexithymia may represent a relevant and independent risk factor for hypertension and carotid atherosclerosis at the population level. None of the putative confounders mediated a relevant proportion of the risk. Prospective studies are needed to confirm this association.     

A family history of alcoholism relates to alexithymia in substance use disorder patients

Objectives

Previous research identified alexithymia as a potential risk factor for substance use disorders (SUD). More insight into the relation between alexithymia and SUD is needed in order to treat SUD effectively. Therefore, we investigated whether a familial vulnerability to alcoholism relates to the presence and severity of alexithymia in SUD patients.

Method

Hospitalized, abstinent SUD-patients (n = 187), were assessed with the Toronto Alexithymia Scale (TAS-20) and Addiction Severity Index (EuropASI). A maternal, paternal, and total continuous measure of the Family History of Alcohol (FHA) was developed. Kruskal-Wallis tests and Spearman correlations were used to relate the composite scores of FHA to alexithymia as a categorical and continuous measure. Multivariate regression models were performed to control for the effects of confounders on the relation between FHA and alexithymia.

Results

Compared to moderate (33%) and low (17%) alexithymic SUD-patients, high alexithymic (50%) patients were more likely to have fathers with alcohol problems (P = 0.004). Such a difference was not found for mothers with alcohol problems. The composite FHA-score was significantly associated with alexithymia (Rs = .19, P = 0.01). However, only a paternal FHA, independent from disturbed family functioning, related to the degree of alexithymia (β = .13, P = 0.06), especially to the Difficulty Identifying Feelings as measured by the TAS-20 (β = .16, P = 0.02).

Conclusions

The relation between a paternal FHA and a higher degree of alexithymia in SUD-patients suggests that alexithymia could mediate the familiality of alcoholism or SUD in the paternal line.     

A prospective long-term follow-up study of alexithymia in obsessive-compulsive disorder

Background

Studies evaluating the stability of alexithymia over long follow-up periods are rare. We examined the temporal stability of alexithymia in patients with obsessive-compulsive disorder (OCD) over 6 years and the association of alexithymia with the long-term outcome of OCD.

Sampling and Methods

Of 42 patients with OCD, 34 (81%) could be reassessed 6 years after inpatient treatment. The 20-item Toronto Alexithymia Scale, Yale-Brown Obsessive-Compulsive Scale, and Hamilton Depression Rating Scale were used at pretreatment, posttreatment, and follow-up.

Results

The 20-item Toronto Alexithymia Scale total scores and its factors 1 and 2 decreased significantly during follow-up, whereas factor 3 remained stable. High correlations of the 20-item Toronto Alexithymia Scale total scores (r = 0.84, P < .001) and its 3 factors emerged between posttreatment and follow-up, suggesting relative stability over several years. Regression analyses (with and without controlling for depressive symptoms) showed that higher alexithymia scores did not predict a worse long-term outcome of OCD.

Conclusions

Relative stability over such a very long follow-up period strongly supports the view that alexithymia is a stable psychologic characteristic in patients with OCD. The result that higher alexithymia scores were not associated with poorer long-term outcome of OCD might be explained with the decrease of alexithymia during treatment and follow-up. However, our sample size was small, and further research is clearly required to evaluate the impact of changes in alexithymia and its association with the course of OCD.     

Is alexithymia a risk factor for major depression, personality disorder, or alcohol use disorders? A prospective population-based study

Objective

Disagreements concerning the stability of alexithymia and its ability to predict subsequent psychiatric disorders prevail. The aim of this 7-year follow-up study was to examine whether alexithymia predicts subsequent major depression, personality disorder, or alcohol use disorders in a population-based sample.

Methods

The four-phase Kuopio Depression Study (KUDEP) was conducted in the eastern part of Central Finland. The study population (aged 25-64, n=2050) was randomly selected from the National Population Register. Data were collected in 1998, 1999, and 2001. In 2005, a subsample (n=333, 43 were excluded) of the 3-year follow-up population (1998-2001) was gathered and their diagnoses of mental disorders were confirmed by the Structure Clinical Interview for DSM-IV Axis I (SCID-I). Alexithymia was measured using the Toronto Alexithymia Scale (TAS-20) and depressive symptoms using the Beck Depression Inventory (BDI-21). For both of these measures, two groups were formed based on the median of their sum score (summing the 1998, 1999, and 2001 scores). Logistic regression analyses were performed.

Results

BDI sum scores, but not those of TAS, were associated with subsequent major depressive disorder, personality disorder, and alcohol use disorders in 2005. The BDI sum scores explained 35.7% of the variation in concurrent TAS sum scores.

Conclusion

Alexithymia did not predict diagnoses of major depressive disorder, personality disorder, or alcohol use disorders. Alexithymia was closely linked to concurrent depressive symptoms. Thus, depressive symptoms may act as a mediator between alexithymia and psychiatric morbidity.     

Is alexithymia linked with marital satisfaction or attachment to the partner? A study in a pregnancy cohort of parents-to-be

Objective

To investigate possible associations of alexithymia with marital satisfaction and mutual attachment between the partners in a group of parents-to-be during pregnancy.

Methods

The present study was conducted in a pregnancy cohort. Cross-sectional data were available for 151 mothers and 106 fathers, and altogether 102 couples. The 20-item Toronto Alexithymia Scale (TAS-20) was used to assess alexithymia, the Index of Marital Satisfaction (IMS) to assess romantic relationship satisfaction and the Experiences in Close Relationships Scale (ECR) to evaluate attachment-related anxiety and avoidance. Kruskal–Wallis test was used for categorized variable comparisons. For continuous variables, Spearman correlation analyses and linear regression analyses were conducted.

Results

The TAS-20 total score, as well as, two of its dimensions, difficulties in identifying and describing feelings, were significantly correlated (p < 0.01) with both the IMS scores and the ECR anxiety and avoidance scores. In the regression analyses, the most significant predictive factor for the subjects' IMS scores was their partners' corresponding scores, although among fathers the IMS scores were partly explained by their own TAS-20 factor 1 scores (p = 0.004). The subjects' own TAS-20 scores explained the ECR anxiety and avoidance scores to a significant extent, but the fathers' TAS-20 factor 3 scores were also associated with the mothers' avoidance scores (p = 0.037).

Conclusion

Alexithymia was not directly related to marital satisfaction. However, alexithymia appears to have a significant effect on relationship-related anxiety and avoidance. This association should be further studied in parents and their offspring in a longitudinal setting.     

The TAS-20 more likely measures negative affects rather than alexithymia itself in patients with major depression,panic disorder,eating disorders and substance use disorders

Background

This study evaluates whether the difference in Toronto Alexithymia Scale-20 item (TAS-20) between patients with major depression (MD), panic disorder (PD), eating disorders (ED), and substance use disorders (SUD) and healthy controls persisted after controlling for the severity of anxiety and depression.

Methods

Thirty-eight patients with MD, 58 with PD, 52 with ED, and 30 with SUD and 78 healthy controls (C) completed the TAS-20, the Hamilton Rating Scale for Anxiety (Ham-A), the Hamilton Rating Scale for Depression (Ham-D).

Results

The differences in TAS-20 scores observed between patient groups, regardless of the type of their disorders, and controls disappeared after controlling for the effect of anxiety and depression severity. In contrast, the differences in severity of anxiety and depression between patients and controls were still present, after excluding the effect of alexithymic levels.

Conclusions

Our data suggest that alexithymic levels, as measured by the TAS-20, are modulated by the severity of symptoms, supporting the view that alexithymia can represent a state phenomenon in patients with MD, PD, ED and SUD, because the TAS-20 seems overly sensitive to a general distress syndrome, and it is more likely to measure negative affects rather than alexithymia itself.     

The impact of attachment insecurity and sleep disturbance on symptoms and sick days in hospital-based health-care workers

Objective

Adult attachment insecurity is associated with many health outcomes and may be associated with sleep disturbance. The purpose of this study was to test the hypothesis that sleep disturbance mediates the relationship between attachment insecurity and three measures of health (perceived general health, physical symptoms and sick days) in a group that is at high risk of sleep disturbance: hospital based health-care workers.

Methods

One hundred thirty-one nondepressed female hospital workers completed self-report measures of adult attachment, sleep disturbance, depressive symptoms (excluding sleep-related items) and health outcomes. The hypothesis of mediation was tested with sequential regression analyses.

Results

Both attachment anxiety and attachment avoidance were significantly associated with impairment in global sleep quality (ρ=.20 and .19, respectively, P<.05) and physical symptoms (ρ=.21 and .19, P<.05). Attachment anxiety was also associated with depressive symptoms (ρ=.33, P<.001) and sick days (ρ=.21, P<.05). For both physical symptoms and sick days, mediation analyses were consistent with global sleep quality acting as a partial mediator of the relationship between attachment anxiety and physical health. Non-sleep-related depressive symptoms were a stronger mediator.

Conclusions

This study corroborates evidence that attachment insecurity is associated with sleep disturbance and extends this association to the occurrence of physical symptoms and time off work due to sickness among workers in a high-stress occupation.     

Reliability and Validity of the 20-Item Toronto Alexithymia Scale in Korean Adolescents

Objective

Adolescence is a period of developing emotional regulation. However, alexithymia has rarely been examined during this period. The objective of this study is to examine the factor structure and internal consistency of the Korean version of the 20-item Toronto Alexithymia Scale (TAS-20K) in normal adolescents in South Korea.

Methods

The TAS-20K was administered to a sample of 290 adolescents aged from 12 to 16 years old. Internal reliability, test-retest reliability, and factorial validity were evaluated.

Results

The three factors of the TAS-20K were confirmed by confirmatory factor analysis. The internal consistency, measured using Cronbach''s alpha coefficient was acceptable for difficulty in identifying feelings, good for difficulty in describing feelings, and acceptable for externally oriented thinking.

Conclusion

Our study indicates that the TAS-20K is an appropriate instrument to assess alexithymia in Korean adolescents.     

Stability of alexithymia in late adolescence: Results of a 4-year follow-up study

The aim of the present study was to assess the stability of alexithymia in adolescents and the effects of parental factors and social support thereon. The sample comprised 315 late adolescents, of whom 259 were female and 56 male. At baseline, the mean age of the subjects was 19 years (range 17–21 years). The follow-up period was 4 years (2008–2012). The 20-item Toronto Alexithymia Scale (TAS-20) was used for the assessment of alexithymia both at baseline and follow-up. The Multidimensional Scale of Perceived Social Support (MSPSS) and the Parental Bonding Instrument (PBI) were used as measures at baseline. Regarding absolute stability, the changes in the TAS-20 total scores and two subscales (DIF and EOT) were statistically significant but the effect sizes for the changes were small (Cohen?s d 0.21–0.24). The test–retest correlations for the TAS-20 total and subscale scores were high (ρ=0.50–0.64, P<0.001), indicating relative stability. While several parental and social support variables were associated with alexithymia at baseline, low social support from friends was the only to predict higher alexithymia at follow-up. Alexithymia is a stable personality trait also in late adolescence. Low social support from friends is related to alexithymia in young adulthood.     

De la non-expression à la surexpression des émotions ou comment l’expérience émotionnelle repose la question des liens entre sexe, alexithymie et répression

Objectives

Alexithymia, considered as a disorder of affect regulation, is well known for its consequences on the vulnerability to negative emotions, but nevertheless it raises the question of the repressive dimension according to Myers’ (1995) and Newton and Contrada’s (1994) researches. If, under certain conditions, alexithymia refers to this dimension we should observed traces of this repressive behaviour on emotional distress. We thus studied the influence of alexithymia scores on trait anxiety, state anxiety and depression, and this relatively to the gender of the participants.

Methodology

We first compared the mean scores of distress of our three groups of subjects (low alexithymia, N = 32; moderate alexithymia, N = 62, high alexithymia, N = 33) with the norms of the general population. Secondly, we studied the consequences of alexithymia intensity on depressive symptoms, trait and state anxiety, with regard to the gender differences. We used 1) the State-Trait Anxiety Inventory (Spielberger) to assess dispositional and acute anxiety, 2) the Center for Epidemiological Scale for Depression (Radloff) to evaluate depressive symptomatology and 3) the Toronto Alexithymia Scale (Bagby) for the alexithymia construct.

Results

In the lower alexithymia group, the total mean scores of depression for men or women (men: 8.06 ± 7.06; women: 8.88 ± 6.84) were significantly lower than those in the general population (men: 12.73 ± 3.02; women: 13.97 ± 3.62). We obtained the same pattern of consequences of a low alexithymia with regard to trait anxiety (men: 32.73 ± 10.20 versus 41.86 ± 9.48; women: 37.17 ± 8.48 versus 45.09 ± 11.11). Finally, there was no difference between the lower alexithymia group mean scores and the general population references, regardless of gender. In addition, in our group of women, the higher the alexithymia mean scores, the more important were the depression (F(2,68) = 21.13, P ≤ 0.000), trait anxiety (F(2,68) = 12.51, P ≤ 0.000) and state anxiety (F(2,68) = 6.72, P ≤ 0.002) mean scores. The male participants did not show a particular vulnerability to the alexithymia intensity, except for trait anxiety in the moderate condition (t(43) = -2.30, P ≤ 0.026).

Conclusion

Our results support the reality of the emotional repression in the condition of lower alexithymia and raise the question of the links between alexithymia and gender. Indeed, emotional experience follows different and surprising ways, inviting us to think about the relevance of a differentiation of the type of alexithymia according to whether one is a man or a woman.     

The Relationship between Alexithymia and General Symptoms of Patients with Depressive Disorders

Objective

Depression has been associated with alexithymic features. However, few studies have investigated the differences in the general symptoms of patients with depressive disorders according to the presence of alexithymia. Thus, the aim of this study was to evaluate the relationship between alexithymia and symptoms experienced by patients with clinically diagnosed depressive disorders.

Methods

A chart review of patients who were evaluated using the Korean version of the 20-item Toronto Alexithymia Scale (TAS-20) and Symptom Checklist 90-Revised (SCL-90-R) at the same time between the years 2003 and 2007 was conducted. A total of 104 patients with depressive disorders were included and divided into two groups: alexithymia (n=52) and non-alexithymia (n=52). A direct comparison between the two groups was carried out. Regression analysis was also carried out for the TAS-20 total and subset scores in order to model the relationship between alexithymia and symptoms.

Results

The presence of alexithymia was confirmed in 50% of the patients with depressive disorders, and the symptoms of depressive patients with alexithymia were more severe than those of their non-alexithymic counterparts on all 9 symptom domains of the SCL-90-R. Furthermore, regression analysis revealed that the presence of alexithymia was positively associated with depression, phobic anxiety, and psychoticism but inversely associated with anxiety.

Conclusion

These results suggest that the clinical features of depression are partially dependent on the presence of alexithymia. Alexithymic patients with depressive disorders are likely to show more severe depressive, psychotic, and phobic symptoms. In other words, clinicians should suspect the presence of alexithymic tendencies if these symptoms coexist in patients with depressive disorders and address their difficulties in effective communication.     

The German version of the Toronto Structured Interview for Alexithymia: factor structure, reliability, and concurrent validity in a psychiatric patient sample

Background

Recently, the Toronto Structured Interview for Alexithymia (TSIA) was developed to supplement the self-assessment of alexithymia and/or offer a different method of measuring the alexithymia construct. The aim of this study was to evaluate the psychometric properties of a German language translation of the TSIA in a psychiatric patient sample.

Methods

Translation and back-translation were performed until a high agreement of cross-language equivalence was obtained between the German and the original English language version of the TSIA. The TSIA and the German language version of the 20-Item Toronto Alexithymia Scale were administered to 237 psychiatric patients at the departments of psychiatry and psychotherapy in Germany and Switzerland. Videotapes of some of the interviews were recorded for the assessment of interrater reliability.

Results

The German version of the TSIA and its 4 scales correlated significantly with the German version of the 20-Item Toronto Alexithymia Scale and its 3 factor scales, providing support for concurrent validity of the interview. Confirmatory factor analyses supported the hierarchical, 4-factor structure obtained with the original English version, with 4 lower-order factors nested within 2 higher-order latent factors. Acceptable levels of internal reliability and interrater reliability were also demonstrated.

Conclusion

The TSIA is a valid and reliable measure for assessing alexithymia, at least in clinical samples. The TSIA, together with a self-report alexithymia scale, allow for a multimethod approach to assessing alexithymia.     

A Comparative Study on Alexithymia in Depressive,Somatoform, Anxiety,and Psychotic Disorders among Koreans

Objective

Little is known about the characteristic differences in alexithymic construct in various psychiatric disorders because of a paucity of direct comparisons between psychiatric disorders. Therefore, this study explored disorder-related differences in alexithymic characteristics among Korean patients diagnosed with four major psychiatric disorders (n=388).

Methods

Alexithymic tendencies, as measured by the Korean version of the 20-item Toronto Alexithymia Scale (TAS-20K), of patients classified into four groups according to major psychiatric diagnosis were compared. The groups consisted of patients with depressive disorders (DP; n=125), somatoform disorders (SM; n=78), anxiety disorders (AX; n=117), and psychotic disorders (PS; n=68).

Results

We found that substantial portions of patients in all groups were classified as having alexithymia and no statistical intergroup differences emerged (42.4%, 35.9%, 35.3%, and 33.3% for DP, SM, PS, and AX). However, patients with DP obtained higher scores in factor 2 (difficulties describing feelings) than those with SM or AX, after adjusting for demographic variables.

Conclusion

These findings suggest that alexithymia might be associated with a higher vulnerability to depressive disorders and factor 2 of TAS-20K could be a discriminating feature of depressive disorders.     

Toronto alexithymia scale for patients with eating disorder: Of performance using the non-parametric item response theory

Background

The aim of this study was to investigate the performance of the Toronto Alexithymia Scale (TAS-20) in patients with eating disorders. As a secondary objective, we analyzed a subset of items in order to determine whether the total score is a good tool for classifying these patients and whether the items are ordered according to the difficulty of choosing a particular answer depending on the severity of the patient's condition.

Subjects and Methods

We administered the TAS-20 to 103 consecutive patients who met DSM-IV-R criteria for anorexia nervosa, bulimia nervosa, or eating disorders not otherwise specified. Mokken scale analysis, nonparametric item response theory (NIRT), and confirmatory factor analysis (CFA) were used to test the psychometric properties of the scale. To improve our understanding of the structure underlying the TAS-20, we used an automated item selection procedure based on the Mokken scale.

Results

We identified a subset of 13 independent and clinically interpretable items that are potentially sufficient to rate patients with alexithymia. This subset was considered a unidimensional reduction of the TAS-20. However, the scale composed of this subset needs to be validated. Thirteen of the 20 items were maximally related to alexithymia because they have a one-dimensional structure. The NIRT and CFA enabled us to identify a maximal subset of items that conform to the requirements for good measurement of alexithymia in patients with eating disorders.