PubMed Health⌕ Search

Biomedical subjects

A Korten

Publications and source records attributed to A Korten.

16 recordsLinked to original sources
PubMed1998

Sex differences in the prevalence and detection of depressive and anxiety disorders in general health care settings: report from the World Health Organization Collaborative Study on Psychological Problems in General Health Care.

BACKGROUND: Understanding the relevance of biological and social factors to sex differences in the prevalence and detection of depressive and anxiety disorders has been impaired by the lack of standardized research methods across cultures. METHOD: Prevalence rates of depressive and anxiety disorders were assessed using a 2-stage design from 26,969 patients attending for primary care in 15 centers from 4 continents. Logistic regression analysis was used to examine sex differences in prevalence and detection across centers. RESULTS: Odds ratios for women compared with men of current depression (1.60; 95% confidence interval [CI], 1.37-1.86) and agoraphobia or panic (1.63; 95% CI, 1.18-2.20) were consistent across centers. The odds ratio for generalized anxiety varied among centers: 3 groups of centers were identified with odds ratios of 0.46 (95% CI, 0.27-0.78), 1.34 (95% CI, 1.08-1.66), and 3.09 (95% CI, 1.60-5.89). There was no sex difference in the detection of depressive and anxiety disorders by physicians across centers. CONCLUSIONS: The absence of a sex-by-center effect for current depression and agoraphobia or panic disorder is consistent with biological and psychosocial factors, either interacting or working alone, that have a similar final effect across cultures. It does not support the idea that sex differences in prevalence are caused by local psychosocial factors that vary from country to country. The variation in the odds ratio for generalized anxiety disorder offers some support to the idea that there are local differences between the centers contributing to the sex difference in rates. Patients' sex does not appear to affect the likelihood of current depression and anxiety being detected by primary care physicians.

Agoraphobia↗
PubMed1996

Activity levels and cognitive functioning in an elderly community sample.

The influence of self-reported and informant-reported activity levels on Crystallized Intelligence, Fluid Intelligence, Memory and the Mini-Mental State Examination was investigated in a sample of 858 community-dwelling elderly subjects. Both self-reported and informant-reported activity levels explained variance beyond that accounted for by sex, sensory functioning, activities of daily living, medical conditions, current health problems and education. Age accounted for additional variance once activity and the other contextual variables were entered. Interaction effects indicated that inactivity was associated with poorer performance on fluid intelligence in older rather than younger elderly subjects and that inactivity was predictive of poor crystallized intelligence at younger ages. Higher informant-rated activity levels moderated the effects of education, so that higher activity offset effects associated with low education on memory tasks. The mount of variance explained by activity levels was modest.

Activities of Daily Living↗
PubMed1995

Progress toward achieving a common language in psychiatry, II: Results from the international field trials of the ICD-10 diagnostic criteria for research for mental and behavioral disorders.

OBJECTIVE: In preparing for the publication of ICD-10, the Division of Mental Health of the World Health Organization developed several versions of chapter V, which deals with mental and behavioral disorders. The version for research purposes is called the Diagnostic Criteria for Research (ICD-10 DCR) and gives operational criteria for the diagnosis of mental disorders. This article describes the results of international field trials undertaken to evaluate the draft criteria and refine them further. METHOD: Data were obtained to assess interrater agreement, the confidence with which diagnoses could be made, and the ease of use of the criteria. Additional substudies examined the concordance between ICD-10 DCR, ICD-10 Clinical Descriptions and Diagnostic Guidelines, and other national classification systems (e.g., DSM-IV). The field trials were carried out at 151 clinical centers in 32 countries by 942 clinician/researchers who conducted 11,491 individual assessments of patients. Results for cases assessed by at least two raters are reported here. RESULTS: Most clinician/researchers found the criteria to be explicit and easy to apply. Interrater agreement was high for most diagnostic categories. For some categories, such as those dealing with certain polymorphic psychotic disorders or milder forms of affective disorders, the criteria were rated as somewhat difficult to use, and reliability was lower. Comparison of the results of these field trials with those of the ICD-10 Clinical Descriptions and Diagnostic Guidelines demonstrated that there are increases in interrater agreement when the operational criteria are used. CONCLUSIONS: The use of internationally accepted research criteria enhances the reliability of diagnosis of mental disorders made in research settings worldwide.

Adolescent↗
PubMed1994

Common mental disorders and disability across cultures. Results from the WHO Collaborative Study on Psychological Problems in General Health Care.

OBJECTIVE: To examine the impact of common mental illness on functional disability and the cross-cultural consistency of this relationship while controlling for physical illness. A secondary objective was to determine the level of disability associated with specific psychiatric disorders. DESIGN: A cross-sectional sample selected by two-stage sampling. SETTING: Primary health care facilities in 14 countries covering most major cultures and languages. PATIENTS: A total of 25,916 consecutive attenders of these facilities were screened for psychopathology using the General Health Questionnaire (96% response). Screened patients were sampled from the General Health Questionnaire score strata for the second-stage Composite International Diagnostic Interview administered to 5447 patients (62% response). MAIN OUTCOME MEASURES: Patient-reported physical disability, number of disability days, and interviewer-rated occupational role functioning. RESULTS: After controlling for physical disease severity, psychopathology was consistently associated with increased disability. Physical disease severity was an independent, although weaker, contributor to disability. A dose-response relationship was found between severity of mental illness and disability. Disability was most prominent among patients with major depression, panic disorder, generalized anxiety, and neurasthenia; disorder-specific differences were modest after controlling for psychiatric comorbidity. Results were consistent across disability measures and across centers. CONCLUSIONS: The consistent relationship of psychopathology and disability indicates the compelling personal and socioeconomic impact of common mental illnesses across cultures. This suggests the importance of impairments of higher-order human capacities (eg, emotion, motivation, and cognition) as determinants of functional disability.

Adolescent↗
PubMed1994

Symptom profiles of psychiatric disorders based on graded disease classes: an illustration using data from the WHO International Pilot Study of Schizophrenia.

The Grade of Membership (GoM) model is a classification procedure which allows a person to be a member of more than one diagnostic class. It simultaneously quantifies the degrees of membership in classes while generating the discrete symptom profiles or 'pure types' describing classes. The model was applied to the symptomatology, history, and follow-up of 1065 cases in the WHO International Pilot Study of Schizophrenia. The model produced an eight diagnostic class or 'pure type' solution, of which five were related to the diagnostic concepts of schizophrenia and paranoid disorder, two types were affective disorders, and one asymptomatic type. A subtype of paranoid schizophreniform disorder found primarily in developing countries was identified. There was a strong association between pure types and the original clinical and computer generated (CATEGO) diagnoses. A GoM based psychiatric classification might more clearly identify core disease processes than conventional classification models by filtering the confounding effects of individual heterogeneity from pure type definitions.

Adult↗
PubMed1992

The International Pilot Study of Schizophrenia: five-year follow-up findings.

A five-year follow-up of the patients initially included in the International Pilot Study of Schizophrenia was conducted in eight of the nine centres. Adequate information was obtained for 807 patients, representing 76% of the initial cohort. Clinical and social outcomes were significantly better for patients in Agra and Ibadan than for those in the centres in developed countries. In Cali, only social outcome was significantly better.

Activities of Daily Living↗
PubMed1990

Relatives' expressed emotion and the course of schizophrenia in Chandigarh. A two-year follow-up of a first-contact sample.

A two-year follow-up was conducted of a subsample of the Chandigarh cohort of first-contact schizophrenic patients from the WHO Determinants of Outcome project. The patients were those living with family members who had been interviewed initially to determine their levels of expressed emotion (EE). The interview was repeated for 74% of the relatives at one-year follow-up. A dramatic reduction had occurred in each of the EE components and in the global index. No rural relative was rated as high EE at follow-up. Of the patients included in the one-year follow-up, 86% were followed for two years. In contrast to the one-year findings, the global EE index at initial interview did not predict relapse of schizophrenia over the subsequent two years. However, there was a significant association between initial hostility and subsequent relapse. The better outcome of this cohort of schizophrenic patients compared with samples from the West is partly attributable to tolerance and acceptance by family members.

Attitude to Health↗
PubMed1987

Stressful life events preceding the acute onset of schizophrenia: a cross-national study from the World Health Organization.

This study reports on the findings from a WHO sponsored cross-national investigation of life events and schizophrenia. Data are presented from a series of 386 acutely ill schizophrenic patients selected from nine field research centers located in developing and developed countries (Aarhus, Denmark; Agra, India; Cali, Colombia; Chandigarh, India; Honolulu, USA; Ibadan, Nigeria; Nagasaki, Japan; Prague, Czechoslovakia; Rochester, USA). On a methodological level, the study demonstrates that life event methodologies originating in the developed countries can be adapted for international studies and may be used to collect reasonably reliable and comparable cross-cultural data on psychosocial factors affecting the course of schizophrenic disorders. Substantive findings replicate the results of prior studies which conclude that socioenvironmental stressors may precipitate schizophrenic attacks and such events tend to cluster in the two to three week period immediately preceding illness onset.

Adolescent↗
PubMed1987

Expressed emotion and schizophrenia in north India. I. Cross-cultural transfer of ratings of relatives' expressed emotion.

A bilingual rater was trained in English in a technique of assessing relatives emotional attitudes to patients, and was then required to rate material in Hindi without any further experience. This strategy revealed that the rating of critical comments, hostility and positive remarks could be transferred from English to Hindi without distortion. There were problems with the remaining two scales, over-involvement and warmth, but these were due to technical issues connected with rating and not to cross-cultural distortion.

Adolescent↗
PubMed1987

Expressed emotion and schizophrenia in north India. II. Distribution of expressed emotion components among relatives of schizophrenic patients in Aarhus and Chandigarh.

We measured the components of expressed emotion among two samples of relatives of first-contact patients from Aarhus (Denmark) and Chandigarh (India). The Danes were very similar in most respects to samples of British relatives, whereas the Indian relatives expressed significantly fewer critical comments, fewer positive remarks, and less over-involvement. Within the Chandigarh sample, city-dwellers were significantly more expressive than villagers of all EE components except over-involvement.

Adolescent↗
PubMed1987

Expressed emotion and schizophrenia in north India. III. Influence of relatives' expressed emotion on the course of schizophrenia in Chandigarh.

We conducted a one-year follow-up of patients who had made a first contact with psychiatric services in Chandigarh, North India, and had been assigned a diagnosis of schizophrenia. The expressed emotion (EE) of the patients' relatives was assessed early on. We found the same associations between the individual components of EE and relapse of schizophrenia as in previous Anglo-American studies, but only the association between hostility and relapse was statistically significant. Applying the same criteria as in the Anglo-American studies for 'high EE', we found a significant relationship between high EE and relapse rates. We conclude that the significantly better outcome of Chandigarh first-contact patients compared with a London sample is largely due to the significantly lower proportion of high-EE relatives in the North Indian sample.

Attitude to Health↗
PubMed1986

Early manifestations and first-contact incidence of schizophrenia in different cultures. A preliminary report on the initial evaluation phase of the WHO Collaborative Study on determinants of outcome of severe mental disorders.

In a context of a WHO collaborative study, 12 research centres in 10 countries monitored geographically defined populations over 2 years to identify individuals making a first-in-lifetime contact with any type of 'helping agency' because of symptoms of psychotic illness. A total of 1379 persons who met specified inclusion criteria for schizophrenia and other related non-affective disorders were examined extensively, using standardized instruments, on entry into the study and on two consecutive follow-ups at annual intervals. Patients in different cultures, meeting the ICD and CATEGO criteria for schizophrenia, were remarkably similar in their symptom profiles and 49% of them presented the central schizophrenic conditions as defined by CATEGO class S+. However, the 2-year pattern of course was considerably more favourable in patients in developing countries compared with patients in developed countries, and the difference could not be fully explained by the higher frequency of acute onsets among the former. Age- and sex-specific incidence rates and estimates of disease expectancy were determined for a 'broad' diagnostic group of schizophrenic illness and for CATEGO S+ cases. While the former showed significant differences among the centres, the differences in the rates for S+ cases were non-significant or marginal. The results provide strong support for the notion that schizophrenic illnesses occur with comparable frequency in different populations and support earlier findings that the prognosis is better in less industrialized societies.

Adolescent↗
PubMedDate not supplied

Molecular genetics and the epidemiology of common mental disorders: new opportunities.

AIM: To describe the rationale for introducing molecular genetic analyses to psychiatric epidemiology. This offers new possibilities for aetiological research on common mental disorders. METHODS: In addition to the traditional variables used in field surveys, it is now possible to include molecular genetic information. This is currently done by looking for allelic associations rather than by linkage analysis, and can be directed either at traits conferring susceptibility or at states. The purpose is to identify quantitative trait loci (QTLs) by examining candidate genes. An alternative strategy is genome scanning, which can identify genes by their chromosomal position with increasing resolution. RESULTS: Some associations have already been reported in the literature, linking personality traits with particular alleles extraversion or novelty-seeking with a polymorphism of the dopamine DRD4 receptor gene; and neuroticism with a polymorphism of the serotonin transporter gene. CONCLUSIONS: These findings are of major interest, but cannot yet be looked upon as confirmed. What is significant for epidemiology is the opportunity to link behavioural and psychiatric variables with genes influencing biochemical and physiological processes in the brain, and to do so at the population level. For further allelic association studies, there are four principal requirements: valid measures of phenotypes; replication of findings across diverse populations; more candidate genes; and exploration of the interaction between genotype and environmental exposures from conception to late life. Through such research, psychiatric epidemiology can now investigate biopsychosocial phenomena.

Humans↗