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Biomedical subjects

G Dunn

Publications and source records attributed to G Dunn.

At least 37 records · Page 2Linked to original sources
PubMed2003

Estimating psychological treatment effects from a randomised controlled trial with both non-compliance and loss to follow-up.

BACKGROUND: The Outcomes of Depression International Network (ODIN) trial evaluated the effect of two psychological interventions for the treatment of depression in primary care. Only about half of the patients in the treatment arm complied with the offer of treatment, prompting the question:'what was the effect of treatment in those patients who actually received it?' AIMS: To illustrate the estimation of the effect of receipt of treatment in a randomised controlled trial subject to non-compliance and loss to follow-up. METHOD: We estimated the complier average causal effect (CACE) of treatment. RESULTS: In the ODIN trial the effect of receipt of psychological intervention (an average of about 4 points on the Beck Depression Inventory) is about twice that of offering it. CONCLUSIONS: The statistical analysis of the results of a clinical trial subject to non-compliance to allocated treatment is now reasonably straightforward through estimation of a CACE and investigators should be encouraged to present the results of analyses of this type as a routine component of a trial report.

Data Interpretation, Statistical↗
PubMed2002

Randomised controlled trial of cognitive-behavioural therapy in early schizophrenia: acute-phase outcomes.

BACKGROUND: Cognitive-behavioural therapy (CBT) improves persistent psychotic symptoms. AIMS: To test the effectiveness of added CBT in accelerating remission from acute psychotic symptoms in early schizophrenia. METHOD: A 5-week CBT programme plus routine care was compared with supportive counselling plus routine care and routine care alone in a multi-centre trial randomising 315 people with DSM-IV schizophrenia and related disorders in their first (83%) or second acute admission. Outcome assessments were blinded. RESULTS: Linear regression over 70 days showed predicted trends towards faster improvement in the CBT group. Uncorrected univariate comparisons showed significant benefits at 4 but not 6 weeks for CBT v. routine care alone on Positive and Negative Syndrome Scale total and positive sub-scale scores and delusion score and benefits v. supportive counselling for auditory hallucinations score. CONCLUSIONS: CBT shows transient advantages over routine care alone or supportive counselling in speeding remission from acute symptoms in early schizophrenia.

Adult↗
PubMed2002

CBT for psychosis.

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Cognitive Behavioral Therapy↗
PubMed2001

Detection and growth kinetics of SV40 preparations with different enhancer element copy number.

It has been reported that the rate of growth of SV40 in certain cell culture systems is affected by the number of copies of the enhancer element, and that this might in turn affect the ability of manufacturers of polio vaccines to detect SV40 contamination in tests for adventitious agents. Eleven strains of SV40 of which three were primary isolates, three were control strains used in different laboratories and five were well characterised were examined for their enhancer copy number. It was found that the three primary isolates contained a single copy while three preparations used as controls in different laboratories were mixtures of single and multiple copy strains. The remaining five strains consisted of one known double enhancer and four known single enhancer strains. All eleven strains were titrated in BSC-1 cells. There was no correlation between the number of copies of the enhancer element and the rate of growth or the final titre reached, although there was variation between the strains.

Animals↗
PubMed2001

Reduced disability at five years with early treatment of inflammatory polyarthritis: results from a large observational cohort, using propensity models to adjust for disease severity.

OBJECTIVE: To determine the effect of treatment with disease-modifying antirheumatic drugs (DMARDs) and/or steroids on 5-year disability outcome in patients with inflammatory polyarthritis. METHODS: Three hundred eighty-four patients registered by the Norfolk Arthritis Register (a primary care-based observational cohort) were followed up for 5 years. Treatment details and Health Assessment Questionnaire (HAQ) scores were recorded annually. Logistic regression was used to model differences in baseline factors associated with the start of DMARDs and/or steroids within 12 months of baseline. Based on this model, each subject was given a probability of starting treatment ("propensity score"). A second model compared the odds of disability (HAQ score > or =1.00) in treated and untreated patients, adjusting for differences in disease severity using the propensity score. RESULTS: Unadjusted analysis suggested that patients who received treatment had an increased odds of a worse outcome compared with those who did not receive treatment. When adjusted for differences in disease severity, using the propensity score, early treatment (within 6 months of symptom onset) was associated with a similar odds of disability at 5 years compared with those not treated (odds ratio 0.71; 95% confidence interval 0.34, 1.44). In contrast, starting treatment later (> or =6 months) was associated with a 2-fold increased odds of having a HAQ score > or =1.00 at 5 years. CONCLUSION: The propensity score was a useful method of adjusting for "confounding by indication" in observational studies. Furthermore, this study showed that early treatment with DMARDs/steroids (within 6 months of symptom onset) reduced the odds of disability 5 years later to a level comparable with that of patients judged clinically as not requiring treatment.

Adult↗
PubMed2001

Cultural influences on the prevalence of common mental disorder, general practitioners' assessments and help-seeking among Punjabi and English people visiting their general practitioner.

BACKGROUND: Culture influences symptom presentation and help-seeking and may influence the general practitioner's assessment. METHODS: We recruited Punjabi and English GP attenders to a two-phase survey in London (UK) using the Amritsar Depression Inventory and the General Health Questionnaire as screening instruments. The Clinical Interview Schedule was the criterion measure. General practitioners completed Likert assessments. RESULTS: The second phase was completed by 209 Punjabi and 180 English subjects. The prevalence of common mental disorders was not influenced by culture. Punjabi cases more often had 'poor concentration and memory' and 'depressive ideas' but were not more likely to have somatic symptoms. General practitioners were more likely to assess Punjabis with common mental disorder as having 'physical and somatic' symptoms or 'sub-clinical disorders'. Punjabi cases with depressive ideas were less likely to be detected compared with English ones. In comparison to English men, English women were under-detected by Asian general practitioners. Help-seeking English subjects were more likely to be correctly identified as cases. CONCLUSIONS: The prevalence of common mental disorders and somatic symptoms does not differ across cultures. Among English subjects, general practitioners were more likely to identify correctly pure psychiatric illness and mixed pathology; but Punjabi subjects with common mental disorders were more often assessed as having 'sub-clinical disorders' and 'physical and somatic' disorders. English women were less well detected than English men. English help-seeking cases were more likely to be detected.

Adolescent↗
PubMed2001

Health and exposures of United Kingdom Gulf war veterans. Part I: The pattern and extent of ill health.

OBJECTIVES: To assess the health of United Kingdom Gulf war veterans, to compare their health to that of similar personnel not deployed, to describe patterns of ill health in both groups, and to estimate their extent. METHODS: Main Gulf (n=4795) and validation Gulf (n=4793) cohorts were randomly selected within strata from the population deployed to the Gulf and a non-Gulf cohort (n=4790) from those who were not sent. Seven years after the war subjects completed a questionnaire about their health in the past month, including 95 symptom questions and two manikins on which to shade areas of pain or numbness and tingling. Responses were subjected to a principal component analysis with rotation and to a cluster analysis within each cohort. Mean symptom score was used as a measure of severity. Areas shaded on the manikins were coded to indicate widespread pain and possible toxic neuropathy. RESULTS: A response of 85.5% was achieved. Those who had been to the Gulf were more troubled by every symptom with a mean severity score (3.0) substantially greater than in the non-Gulf cohort (1.7). Seven factors were extracted accounting for 48% of the variance. The scores on five factors (labelled psychological, peripheral, respiratory, gastrointestinal, and concentration) were significantly worse in those who had been to the Gulf. Symptoms suggestive of peripheral neuropathy were found more often (12.5%) in the Gulf than the non-Gulf (6.8%) cohorts. Widespread pain was also found more often (12.2% Gulf; 6.5% non-Gulf). Those who had been to the Gulf were found disproportionately (23.8%) in three clusters with high mean severity scores; only 9.8% of non-Gulf respondents were in these clusters. There was no evidence of an important excess in the use of alcohol, tobacco, or referral to hospital specialists by those who had been to the Gulf. For the same level of reported ill health those who had been to the Gulf were less likely to be referred to specialists than non-Gulf veterans. CONCLUSION: 7 Years after the war, the Gulf war veterans were more troubled about their health than those who had not been sent, with a substantial subgroup reporting a pattern of symptoms suggestive of a significant decline in health.

Adult↗
PubMed2001

Health and exposures of United Kingdom Gulf war veterans. Part II: The relation of health to exposure.

OBJECTIVES: To investigate whether, in personnel who served with the United Kingdom forces in the Gulf war, self reported exposures were related to symptoms in a way that was consistent, specific, and credible. METHODS: Responses to symptom and exposure questionnaires, completed 7 or more years after the war, were collected from 7971 subjects deployed in the Gulf, from two exposed cohorts, in a study with an overall response rate of 85.5%. Exposures were considered in three groups, those outside the control of the subjects, the use of prophylaxis, and indicators of susceptibility. Health indices derived from symptom questionnaires were related to reports of 14 exposures in these three groups in a series of multiple regression analyses to allow for confounding. The relation of exposure to complaints of widespread pain and to symptoms suggesting peripheral neuropathy were examined by logistic regression. RESULTS: Consistent but weak correlations between exposures and with health effects were found in independent analyses of the two (main and validation) cohorts. Three exposures outside the control of the subject, the number of inoculations, the number of days handling pesticides, and the days exposed to smoke from oil fires, were consistently and independently related to severity. The number of inoculations was also associated with higher scores on a factor weighted on symptoms associated with skin and musculoskeletal complaints. The number of days handling pesticides related particularly to scores on a neurological factor and to symptoms consistent with toxic neuropathy. CONCLUSION: The relations between exposures and ill health were generally weak. Consistent, specific, and credible relations, warranting further investigation, were found between health indices and two exposures, the reported number of inoculations and days handling pesticides.

Adult↗
PubMed2001

Depressive disorders in Europe: prevalence figures from the ODIN study.

BACKGROUND: This is the first report on the epidemiology of depressive disorders from the European Outcome of Depression International Network (ODIN) study. AIMS: To assess the prevalence of depressive disorders in randomly selected samples of the general population in five European countries. METHOD: The study was designed as a cross-sectional two-phase community study using the Beck Depression inventory during Phase 1, and the Schedule for Clinical Assessment in Neuropsychiatry during Phase 2. RESULTS: An analysis of the combined sample (n=8.764) gave an overall prevalence of depressive disorders of 8.56% (95% CI 7.05-10.37). The figures were 10.05% (95% CI 7.80-12.85) for women and 6.61% (95% CI 4.92-8.83) for men. The centres fall into three categories: high prevalence (urban Ireland and urban UK), low prevalence (urban Spain) and medium prevalence (the remaining sites). CONCLUSIONS: Depressive disorder is a highly prevalent condition in Europe. The major finding is the wide difference in the prevalence of depressive disorders found across the study sites.

Adolescent↗
PubMed2000

Problem solving treatment and group psychoeducation for depression: multicentre randomised controlled trial. Outcomes of Depression International Network (ODIN) Group.

OBJECTIVES: To determine the acceptability of two psychological interventions for depressed adults in the community and their effect on caseness, symptoms, and subjective function. DESIGN: A pragmatic multicentre randomised controlled trial, stratified by centre. SETTING: Nine urban and rural communities in Finland, Republic of Ireland, Norway, Spain, and the United Kingdom. PARTICIPANTS: 452 participants aged 18 to 65, identified through a community survey with depressive or adjustment disorders according to the international classification of diseases, 10th revision or Diagnostic and Statistical Manual of Mental Disorders, fourth edition. INTERVENTIONS: Six individual sessions of problem solving treatment (n=128), eight group sessions of the course on prevention of depression (n=108), and controls (n=189). MAIN OUTCOME MEASURES: Completion rates for each intervention, diagnosis of depression, and depressive symptoms and subjective function. RESULTS: 63% of participants assigned to problem solving and 44% assigned to prevention of depression completed their intervention. The proportion of problem solving participants depressed at six months was 17% less than that for controls, giving a number needed to treat of 6; the mean difference in Beck depression inventory score was -2. 63 (95% confidence interval -4.95 to -0.32), and there were significant improvements in SF-36 scores. For depression prevention, the difference in proportions of depressed participants was 14% (number needed to treat of 7); the mean difference in Beck depression inventory score was -1.50 (-4.16 to 1.17), and there were significant improvements in SF-36 scores. Such differences were not observed at 12 months. Neither specific diagnosis nor treatment with antidepressants affected outcome. CONCLUSIONS: When offered to adults with depressive disorders in the community, problem solving treatment was more acceptable than the course on prevention of depression. Both interventions reduced caseness and improved subjective function.

Adolescent↗
PubMed2000

Associations between demographic and disease-related variables and disability over the first five years of inflammatory polyarthritis: a longitudinal analysis using generalized estimating equations.

OBJECTIVES: To investigate whether the relationship between demographic and disease-related variables and disability is constant during the first five years of inflammatory polyarthritis (IP) and to identify the contribution from involvement of specific joint areas to overall disability. METHODS: 684 patients referred to the Norfolk Arthritis Register were followed for five years using the Health Assessment Questionnaire (HAQ). The relationship between disability and demographic and clinical variables was analyzed using a multi-level modelling approach. RESULTS: Female gender, older age at symptom onset (> or = 64 years), joint involvement at six specific sites, joint tenderness and the number of deformed joints were all independently associated with disability (HAQ > or = 1.00). Similar results were obtained using a more stringent cut-off (HAQ > or = 1.50) or when analysis was restricted to the 325 patients who satisfied the 1987 ARA list criteria for rheumatoid arthritis. CONCLUSION: Disability, as measured by the HAQ, was associated with a large number of independent factors over the first five years of disease.

Adult↗
PubMed2000

Differences in verbal behaviours of patients with and without emotional distress during primary care consultations.

BACKGROUND: In primary care consultations patients with emotional distress tend to give verbal cues or symptom reports with psychological or psychiatric contents. This study examined the cue behaviour defined not only by psychological, but also by medical, social and life episodes related contents in patients with and without emotional distress, recognized and not by their GP. The GP's verbal behaviour in relation to patients' cue emission was also investigated. METHOD: For the six participating GPs two groups of matched pairs of patients (N = 238) were created. The two groups comprised either patients considered by GPs as being without emotional distress or patients considered as emotionally distressed. Within each pair, one patient was a case (GHQ-12 score > 2) and the other was the matched control (GHQ-12 score < 3). The medical interviews with these patients were transcribed and classified according to the Verona Medical Interview Classification System (VR-MICS). RESULTS: GHQ positive patients of both groups gave more cues in terms of total proportion than their matched controls (GHQ negative patients). The proportion of cues given by patients was related also to GP's verbal behaviour, increasing with closed psychosocial questions and decreasing with the use of active interview techniques. Attribution of emotional distress was more frequent when patients were high attenders and had a past psychiatric history. The content of cues changed in relation to GP's attribution: recognized patients gave more cues and more often with psychological content, patients not recognized as distressed gave mainly cues related to their lifestyle and life episodes. CONCLUSIONS: To improve the recognition of those emotionally distressed patients most likely to be missed GPs should increase their attention to cues related to life style and life episodes.

Adult↗
PubMed2000

The classification of first episode schizophrenia: a cluster-analytical approach.

OBJECTIVE: This paper examines, using data from the Cantabria First Episode Schizophrenia Study, the usefulness of subdividing, using a cluster analysis technique, this schizophrenia population into subgroups with similar symptoms profiles in terms of SANS and SAPS. METHOD: Diagnostic characteristics were determined using the Present State Examination (PSE-9) and the SANS/SAPS. Premorbid adjustment was assessed using a scale developed combining the Gittelman and Klein's Scales, and the Goldstein's scales. Social Adjustment was evaluated using the WHO-DAS. In addition clinical histories were used to assess the patients' clinical course. RESULTS: Our schizophrenic patients could be subtyped into four categories: negative, positive non-paranoid, simple and disorganized schizophrenia. There is an absence of significant association between the majority of the variables investigated and the four-cluster model. CONCLUSION: Even though our sample could be subtyped into different categories, the model does not show predictive power according to the 3-year follow-up data.

Acute Disease↗
PubMed2000

Evolution of the Sabin strain of type 3 poliovirus in an immunodeficient patient during the entire 637-day period of virus excretion.

A 20-year-old female hypogammaglobulinemic patient received monotypic Sabin 3 vaccine in 1962. The patient excreted type 3 poliovirus for a period of 637 days without developing any symptoms of poliomyelitis, after which excretion appeared to have ceased spontaneously. The evolution of Sabin 3 throughout the entire period of virus excretion was studied by characterization of seven sequential isolates from the patient. The isolates were analyzed in terms of their antigenic properties, virulence, sensitivity for growth at high temperatures, and differences in nucleotide sequence from the Sabin type 3 vaccine. The isolates followed a main lineage of evolution with a rate of nucleotide substitution that was very similar to that estimated for wild-type poliovirus during person-to-person transmission. There was a delay in the appearance of antigenic variants compared to sequential type 3 isolates from healthy vaccines, which could be one of the possible explanations for the long-term excretion of virus from the patient. The distribution of mutations in the isolates identified regions of the virus possibly involved in adaptation for growth in the human gut and virus persistence. None of the isolates showed a full reversion of the attenuated and temperature-sensitive phenotypes of Sabin 3. Information of this sort will help in the assessment of the risk of spread of virulent polioviruses from long-term excretors and in the design of therapies to stop long-term excretion. This will make an important contribution to the decision-making process on when to stop vaccination once wild poliovirus has been eradicated.

3C Viral Proteases↗
PubMed2000

One year followup variables predict disability 5 years after presentation with inflammatory polyarthritis with greater accuracy than at baseline.

OBJECTIVE: To compare the accuracy of simple demographic and clinical variables recorded at baseline with those recorded after one year followup, in predicting self-reported functional disability recorded 5 years after initial assessment in patients with early inflammatory polyarthritis (IP). METHODS: We followed annually for 5 years 528 patients registered by the Norfolk Arthritis Register (a primary care based cohort of patients with early IP) using the Health Assessment Questionnaire (HAQ). Backward stepwise logistic regression was used to determine the clinical and demographic variables, collected at either baseline or first followup, that were associated with disability (HAQ > or = 1.00/> or =1.50) at 5 years. RESULTS: At the 5th anniversary assessment, the prevalence of moderate disability (HAQ > or = 1.00) was 47%. Twenty-nine percent reported more severe disability (HAQ > or = 1.50). Variables recorded at first anniversary assessment were better able to predict patients at risk of developing a poor outcome than baseline variables. Multivariate methods identified age at symptom onset, HAQ score, presence of nodules, and a statistically derived factor describing joint tenderness recorded at first year as important predictors of both moderate disability (HAQ > or =1.00) and a higher level of disability (HAQ > or = 1.50). When tested in an independent validation sample, the accuracy of the models generated from data recorded at the first year was 76% (HAQ > or = 1.00) and 83% (HAQ > or = 1.50). CONCLUSION: It was possible to predict disability at 5 years with high accuracy using simple clinical variables and demographic data collected 4 or 5 years previously. First year HAQ score was the strongest predictor of future disability. HAQ score at 5 years could be predicted more accurately using data collected at first anniversary visit than using data recorded at baseline.

Adult↗
PubMed1999

The problem of measurement error in modelling the effect of compliance in a randomized trial.

This paper explores the implications of measurement error in the analysis of compliance-response relationships in data from randomized trials. Given that compliance measures are rarely, if ever, error-free indicators of exposure it is argued that both the designs for the collection of compliance data and the statistical models for their resulting analysis should be changed to take the possibility of measurement error into account. An analysis which ignores measurement error in the compliance measurements will provide biased estimates of compliance-response relationships. Provided that one has two or more indicators of compliance for each subject, more appropriate models can be fitted using covariance structure modelling software. If one wishes to explore interactions from repeated measures data on both compliance and response then it is also important that one recognizes that the response measures are also error-prone and that they too are dealt with appropriately.

Bias↗
PubMed1999

Mental health, "burnout" and job satisfaction in a longitudinal study of mental health staff.

BACKGROUND: This study examines whether the adoption of a more community based model in an inner city psychiatry service is accompanied by increasing "burnout", deteriorating mental health and decreasing job satisfaction amongst staff. METHOD: Questionnaires were sent annually for 3 consecutive years to all mental health staff working in three adult mental health sectors in inner London. Main outcome measures were the 12-item General Health Questionnaire, Maslach Burn-out Inventory and a general job satisfaction measure. RESULTS: There was no significant change over time in the outcome measures, once confounding by job and demographic variables was examined. Being based in the community was associated with higher GHQ-12 scores (P = 0.02) when compared to in-patient staff over the 3 years. CONCLUSIONS: These results suggested that working in the community may be more stressful than working in in-patient services. However, there was no evidence to suggest that levels of stress are increasing over time, either in community-based or hospital-based staff.

Adult↗