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Neurocognitive dysfunction in schizophrenia (SZ), bipolar (BD) and related disorders represents a core feature of these illnesses, possibly a marker of underlying pathophysiology. Substantial overlap in domains of neuropsychological deficits has been reported among these disorders after illness onset. However, it is unclear whether deficits follow the same longitudinal pre- and post-morbid course across diagnoses. We examine evidence for neurocognitive dysfunction as a core feature of all idiopathic psychotic illnesses, and trace its evolution from pre-morbid and prodromal states through the emergence of overt psychosis and into chronic illness in patients with SZ, BD and related disorders.
Method
Articles reporting on neuropsychological functioning in patients with SZ, BD and related disorders before and after illness onset were reviewed. Given the vast literature on these topics and the present focus on cross-diagnostic comparisons, priority was given to primary data papers that assessed cross-diagnostic samples and recent meta-analyses.
Results
Patients with SZ exhibit dysfunction preceding the onset of illness, which becomes more pronounced in the prodrome and early years following diagnosis, then settles into a stable pattern. Patients with BD generally exhibit typical cognitive development pre-morbidly, but demonstrate deficits by first episode that are amplified with worsening symptoms and exacerbations.
Conclusions
Neuropsychological deficits represent a core feature of SZ and BD; however, their onset and progression differ between diagnostic groups. A lifetime perspective on the evolution of neurocognitive deficits in SZ and BD reveals distinct patterns, and may provide a useful guide to the examination of the pathophysiological processes underpinning these functions across disorders.
International agreement dictates that clients must be help-seeking before any assessment or intervention can be implemented by an ‘at-risk service’. Little is known about individuals who decline input. This study aimed to define the size of the unengaged population of an ‘at-risk service’, to compare this group to those who did engage in terms of sociodemographic and clinical features and to assess the clinical outcomes of those who did not engage with the service.
Method
Groups were compared using data collected routinely as part of the service's clinical protocol. Data on service use and psychopathology since referral to Outreach and Support in South London (OASIS) were collected indirectly from clients' general practitioners (GPs) and by screening electronic patient notes held by the local Mental Health Trust.
Results
Over one-fifth (n=91, 21.2%) of those referred did not attend or engage with the service. Approximately half of this group subsequently received a diagnosis of mental illness. A diagnosis of psychosis was given to 22.6%. Nearly 70% presented to other mental health services. There were no demographic differences, except that those who engaged with the service were more likely to be employed.
Conclusions
Over one-fifth of those referred to services for people at high risk of psychosis do not attend or engage. However, many of this group require mental health care, and a substantial proportion has, or will later develop, psychosis. A more assertive approach to assessing individuals who are at high risk of psychosis but fail to engage may be indicated.
Social dysfunction is a hallmark symptom of schizophrenia which commonly precedes the onset of psychosis. It is unclear if social symptoms in clinical high-risk patients reflect depressive symptoms or are a manifestation of negative symptoms.
Method
We compared social function scores on the Social Adjustment Scale-Self Report between 56 young people (aged 13–27 years) at clinical high risk for psychosis and 22 healthy controls. The cases were also assessed for depressive and ‘prodromal’ symptoms (subthreshold positive, negative, disorganized and general symptoms).
Results
Poor social function was related to both depressive and negative symptoms, as well as to disorganized and general symptoms. The symptoms were highly intercorrelated but linear regression analysis demonstrated that poor social function was primarily explained by negative symptoms within this cohort, particularly in ethnic minority patients.
Conclusions
Although this study demonstrated a relationship between social dysfunction and depressive symptoms in clinical high-risk cases, this association was primarily explained by the relationship of each of these to negative symptoms. In individuals at heightened risk for psychosis, affective changes may be related to a progressive decrease in social interaction and loss of reinforcement of social behaviors. These findings have relevance for potential treatment strategies for social dysfunction in schizophrenia and its risk states and predict that antidepressant drugs, cognitive behavioral therapy and/or social skills training may be effective.
Auditory P50 sensory gating deficits correlate with genetic risk for schizophrenia and constitute a plausible endophenotype for the disease. The well-supported role of catechol-O-methyltransferase (COMT), brain-derived neurotrophic factor (BDNF) and neuregulin 1 (NRG1) genes in neurodevelopment and cognition make a strong theoretical case for their influence on the P50 endophenotype.
Method
The possible role of NRG1, COMT Val158Met and BDNF Val66Met gene polymorphisms on the P50 endophenotype was examined in a large sample consisting of psychotic patients, their unaffected relatives and unrelated healthy controls using linear regression analyses.
Results
Although P50 deficits were present in patients and their unaffected relatives, there was no evidence for an association between NRG1, COMT Val158Met or BDNF Val66Met genotypes and the P50 endophenotype.
Conclusions
The evidence from our large study suggests that any such association between P50 indices and NRG1, COMT Val158Met or BDNF Val66Met genotypes, if present, must be very subtle.
Patient-reported outcomes (PROs) are widely used for evaluating the care of patients with psychosis. Previous studies have reported a considerable overlap in the information captured by measures designed to assess different outcomes. This may impair the validity of PROs and makes an a priori choice of the most appropriate measure difficult when assessing treatment benefits for patients. We aimed to investigate the extent to which four widely established PROs [subjective quality of life (SQOL), needs for care, treatment satisfaction and the therapeutic relationship] provide distinct information independent from this overlap.
Method
Analyses, based on item response modelling, were conducted on measures of SQOL, needs for care, treatment satisfaction and the therapeutic relationship in two large samples of patients with psychosis.
Results
In both samples, a bifactor model matched the data best, suggesting sufficiently strong concept factors to allow for four distinct PRO scales. These were independent from overlap across measures due to a general appraisal tendency of patients for positive or negative ratings and shared domain content. The overlap partially impaired the ability of items to discriminate precisely between patients from lower and higher PRO levels. We found that widely used sum scores were strongly affected by the general appraisal tendency.
Conclusions
Four widely established PROs can provide distinct information independent from overlap across measures. The findings may inform the use and further development of PROs in the evaluation of treatments for psychosis.
The clinical picture of schizophrenia is frequently worsened by manifestations of impulsivity. However, the neural correlates of impulsivity in this disorder are poorly known. Although impulsivity has been related to disturbances of the neural processes underlying response inhibition, no studies have yet examined the relationship between these processes and psychometric measures of impulsivity in schizophrenia. This was the aim of the current investigation.
Method
Event-related functional magnetic resonance imaging in conjunction with a Go/NoGo task was employed to probe the neural activity associated with response inhibition in 26 patients with schizophrenia and 30 healthy comparison subjects. All participants also completed the Barratt Impulsiveness Scale – version 11 (BIS-11). Voxel-wise regression analyses were used to examine the relationship between the BIS-11 score and brain activation during response inhibition in each group.
Results
Patients with schizophrenia were more impulsive than healthy subjects, as indicated by higher BIS-11 scores. Patients, but not healthy subjects, were found to display a positive correlation between these scores and cerebral activation associated with response inhibition. This correlation involves a unique cluster localized within the right ventrolateral prefrontal cortex (VLPFC), a key node of the brain network subserving response inhibition.
Conclusions
We evidenced in patients with schizophrenia that greater BIS-11 scores are associated with greater activation within the right VLPFC during response inhibition. This finding suggests that the efficiency of this brain region to process inhibitory control is reduced in the more impulsive patients.
The amygdala plays a central role in the fronto-limbic network involved in the processing of emotions. Structural and functional abnormalities of the amygdala have recently been found in schizophrenia, although there are still contradictory results about its reduced or preserved volumes.
Method
In order to address these contradictory findings and to further elucidate the possibly underlying pathophysiological process of the amygdala, we employed structural magnetic resonance imaging (MRI) and diffusion weighted imaging (DWI), exploring amygdalar volume and microstructural changes in 69 patients with schizophrenia and 72 matched healthy subjects, relating these indices to psychopathological measures.
Results
Measuring water diffusivity, the apparent diffusion coefficients (ADCs) for the right amygdala were found to be significantly greater in patients with schizophrenia compared with healthy controls, with a trend for abnormally reduced volumes. Also, significant correlations between mood symptoms and amygdalar volumes were found in schizophrenia.
Conclusions
We therefore provide evidence that schizophrenia is associated with disrupted tissue organization of the right amygdala, despite partially preserved size, which may ultimately lead to abnormal emotional processing in schizophrenia. This result confirms the major role of the amygdala in the pathophysiology of schizophrenia and is discussed with respect to amygdalar structural and functional abnormalities found in patients suffering from this illness.
There is a lack of specific knowledge about the dose–response effect of multiple parental risk factors for suicide attempts among children and adolescents. The aim of this study was to determine the dose–response effect of multiple parental risk factors on an offspring's risk for suicide attempt.
Method
We designed a population-based two-generation nested case–control study and used Danish register data. A population of 403 431 individuals born between 1983 and 1989 was sampled. Among these, 3465 (0.8%) were registered as having had a suicide attempt. Twenty controls were matched to each case and a link to the offspring's biological parents was established.
Results
There was a dose–response relationship between the number of exposures and the risk of suicide attempts, with the increased risk seeming to be a multiplicative effect. Parental suicide, suicide attempt, psychiatric illness and low level of income were all significant independent risk factors for offspring's suicide attempts.
Conclusions
Knowledge of the effect of multiple risk factors on the likelihood of suicide attempts in children and adolescents is important for risk assessment. Dose–response effects of multiple parental risk factors are multiplicative, but it is rare for children and adolescents to be exposed to multiple parental risk factors simultaneously. Nevertheless, they should be considered along with the offspring's own multiple risk factors in determining the overall risk of a suicide attempt. Further research incorporating both parental and offspring's risk factors is indicated to determine the overall dose–response effect of multiple risk factors.
Prevention of relapse and recurrence represents an important task in the successful treatment of major depressive disorder (MDD). The aim of this meta-analysis was to examine the efficacy of the sequential integration of psychotherapy and pharmacotherapy in reducing the risk of relapse and recurrence in MDD.
Method
Keyword searches were conducted in Medline, EMBASE, PsycINFO and the Cochrane Library from inception of each database to December 2008. Randomized controlled trials examining the efficacy of the administration of psychotherapy after successful response to acute-phase pharmacotherapy in the treatment of adults with MDD were considered for inclusion in the meta-analysis.
Results
Eight high-quality studies with 442 patients in a sequential treatment arm and 433 in a control treatment arm were included. The pooled risk ratio (RR) for relapse/recurrence was 0.797 [95% confidence interval (CI) 0.659–0.964] according to the random-effects model, suggesting a relative advantage in preventing relapse/recurrence for the sequential administration of treatments compared with control conditions. Performing subgroup analyses, we found a trend favoring psychotherapy during continuation of antidepressant drugs compared to antidepressants or treatment as usual (RR 0.842, 95% CI 0.674–1.051). Patients randomized to psychotherapy while antidepressants were discontinued were significantly less likely to experience relapse/recurrence compared to controls (RR 0.650, 95% CI 0.463–0.912).
Conclusions
We found evidence that the sequential integration of psychotherapy and pharmacotherapy is a viable strategy for preventing relapse and recurrence in MDD. In addition, our findings suggest that discontinuation of antidepressant drugs may be feasible when psychotherapy is provided.
Lower cognitive functioning in early childhood has been proposed as a risk factor for depression in later life but its association with depressive symptoms during adolescence has rarely been investigated. Our study examines the relationship between total intelligence quotient (IQ) score at age 8 years, and depressive symptoms at 11, 13, 14 and 17 years.
Method
Study participants were 5250 children and adolescents from the Avon Longitudinal Study of Parents and their Children (ALSPAC), UK, for whom longitudinal data on depressive symptoms were available. IQ was assessed with the Wechsler Intelligence Scale for Children III, and self-reported depressive symptoms were measured with the Short Mood and Feelings Questionnaire (SMFQ).
Results
Multi-level analysis on continuous SMFQ scores showed that IQ at age 8 years was inversely associated with depressive symptoms at age 11 years, but the association changed direction by age 13 and 14 years (age–IQ interaction, p<0.0001; age squared–IQ interaction, p<0.0001) when a higher IQ score was associated with a higher risk of depressive symptoms. This change in IQ effect was also found in relation to pubertal stage (pubertal stage–IQ interaction, 0.00049<p⩽0.038). At age 17 years, however, sex-specific differences emerged (sex–age squared–IQ interaction, p=0.0075). Whilst the risk effect of higher childhood IQ scores for depressive symptoms declined in females, and some analyses even supported an inverse association by age 17 years, it persisted in males.
Conclusions
Our results suggest that the association between cognitive ability in childhood and depressive symptoms in adolescence varies according to age and/or pubertal stage.
Elevated levels of circulating C-reactive protein (CRP) have been associated with coronary heart disease and, in some studies, depression. Most studies have been of populations selected by age and/or gender. We investigate these associations with depression, myocardial infarction (MI), or both, in a large general population sample.
Method
A cross-sectional population study of 9258 women and men aged ⩾20 years. The study included clinical examination, self-report of MI and depression and factors known to confound their associations. The Hospital Anxiety and Depression Scale was used to assess severity of depressive symptoms. Elevated high sensitive-CRP was defined as values >2.2 mg/l.
Results
The association of elevated CRP with depression was attenuated towards the null [from odds ratio (OR) 1.28, p=0.001 to OR 1.08, p=0.388] following extensive adjustment, while associations with MI (adjusted OR 1.42, p=0.032) and co-morbid MI and depression (adjusted OR 2.66, p=0.003) persisted. Confounders associated with elevated CRP levels were smoking (OR 1.66; p<0.001), chronic physical illness (OR 1.34, p<0.001), BMI ⩾30 (OR 1.13, p<0.001), employment (OR 0.70, p<0.001) and high coffee consumption (OR 0.83, p=0.017). Interaction tests indicated a lower effect of old age (OR 0.54, p<0.001) and smoking (OR 0.63, p<0.001) on elevated CRP levels in women compared with men.
Conclusions
CRP levels were raised in those with MI and co-morbid MI and depression; the positive association with depression was explained by confounding factors. We found new evidence that might help understand gender-specific patterns. Future studies should explore the neurobiological mechanisms underpinning these interrelations and their relevance for treatment of these conditions.
There is considerable evidence that immediate and long-term stress reactions are associated with increased somatic symptomatology. However, because of the scarcity of long-term longitudinal studies, the trend of mutual change of these factors has not been assessed. This study examined the chronological inter-relationships between post-traumatic stress reactions and somatization symptoms among combatants over a 20-year period.
Method
Two groups of veterans were assessed 1, 2, 3 and 20 years after their participation in the 1982 Lebanon War: a clinical group of veterans who had been diagnosed with combat stress reaction (CSR) on the battlefield (n=363), and a matched control group of veterans (n=301).
Results
The CSR veterans reported higher initial levels of intrusion and avoidance and a steeper decline in those symptoms over time in comparison to the control group. The former also reported higher initial levels of somatization symptoms than the latter. In addition, over the years, stress reactions were positively associated with somatization symptoms. For both study groups, in the first years after the war, stress reaction symptoms predicted somatization symptoms. However, with time, the trend was reversed and somatization symptoms predicted stress reactions.
Conclusions
The findings suggest that CSR is a marker for future stress reactions and somatization symptoms, and indicate a long-term role for these symptoms in veterans' psychological distress.
There is concern surrounding the psychological health and uptake of treatment services among veterans of the UK Armed Forces.
Method
Data from a cross-sectional, nationally representative sample were used to compare health outcomes and treatment seeking among 257 post-national service veterans aged 16–64 years and 504 age and sex frequency-matched non-veterans living in the community in England. Early leavers (<4 years service) were compared with longer serving veterans.
Results
Male veterans reported more childhood adversity and were more likely to have experienced a major trauma in adulthood than non-veterans. There was no association between any measure of mental health and veteran status in males, except reporting more violent behaviours [adjusted odds ratio (aOR) 1.44, 95% confidence interval (CI) 1.01–2.06]. In females, a significant association was found between veteran status and ever having suicidal thoughts (aOR 2.82, 95% CI 1.13–7.03). No differences in treatment-seeking behaviour were identified between veterans and non-veterans with any mental disorder. Early service leavers were more likely to be heavy drinkers (aOR 4.16, 95% CI 1.08–16.00), to have had suicidal thoughts (aOR 2.37, 95% CI 1.21–4.66) and to have self-harmed (aOR 12.36, 95% CI 1.61–94.68) than longer serving veterans.
Conclusions
The findings of this study do not suggest that being a veteran is associated with adversity in terms of mental health, social disadvantage or reluctance to seek treatment compared with the general population. Some evidence implies that early service leavers may experience more mental health problems than longer-serving veterans.
Self-administered cognitive behavior therapy (SCBT) has been shown to be an effective alternative to therapist-delivered treatment for panic disorder (PD). However, it is unknown whether combining SCBT and antidepressants can improve treatment. This trial evaluated the efficacy of SCBT and sertraline, alone or in combination, in PD.
Method
Patients (n=251) were randomized to 12 weeks of either placebo drug, placebo drug plus SCBT, sertraline, or sertraline plus SCBT. Those who improved after 12 weeks of acute treatment received treatment for an additional 12 weeks. Outcome measures included core PD symptoms (panic attacks, anticipatory anxiety, agoraphobic avoidance), dysfunctional cognitions (fear of bodily sensations, agoraphobic cognitions), disability, and clinical global impression of severity and improvement. Efficacy data were analyzed using general and generalized linear mixed models.
Results
Primary analyses of trends over time revealed that sertraline/SCBT produced a significantly greater rate of decline in fear of bodily sensations compared to sertraline, placebo/SCBT and placebo. Trends in other outcomes were not significantly different over time. Secondary analyses of mean scores at week 12 revealed that sertraline/SCBT fared better on several outcomes than placebo, with improvement being maintained at the end of continuation treatment. Outcome did not differ between placebo and either sertraline monotherapy or placebo/SCBT. Moreover, few differences emerged between the active interventions.
Conclusions
This trial suggests that sertraline combined with SCBT may be an effective treatment for PD. The study could not confirm the efficacy of sertraline monotherapy or SCBT without concomitant medication or therapist assistance in the treatment of PD.
The expanded suffocation false alarm theory (SFA) hypothesizes that dysfunction in endogenous opioidergic regulation increases sensitivity to CO2, separation distress and panic attacks. In panic disorder (PD) patients, both spontaneous clinical panics and lactate-induced panics markedly increase tidal volume (TV), whereas normals have a lesser effect, possibly due to their intact endogenous opioid system. We hypothesized that impairing the opioidergic system by naloxone could make normal controls parallel PD patients' response when lactate challenged. Whether actual separations and losses during childhood (childhood parental loss, CPL) affected naloxone-induced respiratory contrasts was explored. Subjective panic-like symptoms were analyzed although pilot work indicated that the subjective aspect of anxious panic was not well modeled by this specific protocol.
Method
Randomized cross-over sequences of intravenous naloxone (2 mg/kg) followed by lactate (10 mg/kg), or saline followed by lactate, were given to 25 volunteers. Respiratory physiology was objectively recorded by the LifeShirt. Subjective symptomatology was also recorded.
Results
Impairment of the endogenous opioid system by naloxone accentuates TV and symptomatic response to lactate. This interaction is substantially lessened by CPL.
Conclusions
Opioidergic dysregulation may underlie respiratory pathophysiology and suffocation sensitivity in PD. Comparing specific anti-panic medications with ineffective anti-panic agents (e.g. propranolol) can test the specificity of the naloxone+lactate model. A screen for putative anti-panic agents and a new pharmacotherapeutic approach are suggested. Heuristically, the experimental unveiling of the endogenous opioid system impairing effects of CPL and separation in normal adults opens a new experimental, investigatory area.
Numerous epidemiological studies have reported a positive association between major depression (MD) and regular tobacco use (RU) or nicotine dependence (ND). However, few have used a genetically informative design to assess whether these traits share a common genetic and/or environmental liability.
Method
We assessed MD, RU and ND in same-sex twins from the population-based Swedish Twin Registry. In males, we examined both cigarette use and snus (smokeless tobacco) use. We used structural equation modeling to examine the relationship between MD, RU, and ND given RU.
Results
The results suggest modest correlations between MD and RU, and between MD and ND. In males, the liability shared between MD and RU is solely genetic for both cigarettes and snus, while MD and ND share both genetic and unique environmental influences. The continuation to ND given RU differed considerably between cigarette and snus users. In females, both MD–RU and MD–ND relationships are partially attributable to genetic and unique environmental correlations.
Conclusions
The relationship among MD, RU and ND is at least partially attributable to shared genetic and environmental risk factors. The genetic and environmental correlations between traits are modest. The nature of the shared liability differs by sex, and in males, by the type of tobacco product used. Differences between previous reports and results presented in the current study are suggestive of population differences in how MD and tobacco use inter-relate.
Bulimic eating disorders are common among female students, yet the majority do not access effective treatment. Internet-based cognitive-behavioural therapy (iCBT) may be able to bridge this gap.
Method
Seventy-six students with bulimia nervosa (BN) or eating disorder not otherwise specified (EDNOS) were randomly assigned to immediate iCBT with e-mail support over 3 months or to a 3-month waiting list followed by iCBT [waiting list/delayed treatment control (WL/DTC)]. ED outcomes were assessed with the Eating Disorder Examination (EDE) at baseline, 3 months and 6 months. Other outcomes included depression, anxiety and quality of life.
Results
Students who had immediate iCBT showed significantly greater improvements at 3 and 6 months than those receiving WL/DTC in ED and other symptoms.
Conclusions
iCBT with e-mail support is efficacious in students with bulimic disorders and has lasting effects.
Serotonin and dopamine neurotransmitter systems are implicated in the regulation of mood, cognition and personality traits and their dysfunction is thought to be implicated in diverse psychopathologies. However, in healthy subjects the relationship between the serotonin and dopamine systems and neuropsychological functioning and personality traits is not clearly established. In the present study we investigated whether neuropsychological functioning, personality traits and mood states of a group of healthy subjects are associated with in vivo measures of serotonin transporters (SERTs) and dopamine transporters (DATs).
Method
A total of 188 young healthy subjects underwent neuropsychological and subjective measurements of memory function, depression and impulsivity. Participants' SERT and DAT availability in predefined regions of interest were assessed using single photon emission computed tomography (SPECT) with the radiotracer [123I]β-CIT. Individual magnetic resonance imaging (MRI) scans served as anatomic reference.
Results
We did not find any significant association between SERT or DAT availability and neuropsychological test performance or self-reported impulsivity and mood. There were no significant sex differences in SERT or DAT availability, but men performed significantly better on some tests of visuospatial functioning than women.
Conclusions
Robust negative findings for striatal DAT availability seriously question earlier findings of positive associations between DAT availability and cognitive functions in healthy subjects. Our results also suggest that subcortical SERT availability is not associated with the neuropsychological functions and personality traits assessed. In summary, the present study suggests that neuropsychological and personality measurements in young healthy people are not associated with subcortical SERT or striatal DAT availabilities in the brain.
Hypochondriasis is common in the clinic and in the community. Cognitive behavioural therapy (CBT) has been found to be effective in previous trials. Psychodynamic psychotherapy is a treatment routinely offered to patients with hypochondriasis in many countries, including Denmark. The aim of this study was to test CBT for hypochondriasis in a centre that was not involved in its development and compare both CBT and short-term psychodynamic psychotherapy (STPP) to a waiting-list control and to each other. CBT was modified by including mindfulness and group therapy sessions, reducing the therapist time required. STPP consisted of individual sessions.
Method
Eighty patients randomized to CBT, STPP and the waiting list were assessed on measures of health anxiety and general psychopathology before and after a 6-month treatment period. Waiting-list patients were subsequently offered one of the two active treatments on the basis of re-randomization, and assessed on the same measures post-treatment. Patients were again assessed at 6- and 12-month follow-up points.
Results
Patients who received CBT did significantly better on all measures relative to the waiting-list control group, and on a specific measure of health anxiety compared with STPP. The STPP group did not significantly differ from the waiting-list group on any outcome measures. Similar differences were observed between CBT and STPP during follow-up, although some of the significant differences between groups were lost.
Conclusions
A modified and time-saving CBT programme is effective in the treatment of hypochondriasis, although the two psychotherapeutic interventions differed in structure.