Irwin Nazareth

Developing and evaluating complex interventions: the new Medical Research Council guidance

Evaluating complex interventions is complicated. The Medical Research Councils evaluation framework (2000) brought welcome clarity to the task. Now the council has updated its guidance

A systematic review of mental disorder, suicide, and deliberate self harm in lesbian, gay and bisexual people

BackgroundLesbian, gay and bisexual (LGB) people may be at higher risk of mental disorders than heterosexual people.MethodWe conducted a systematic review and meta-analysis of the prevalence of mental disorder, substance misuse, suicide, suicidal ideation and deliberate self harm in LGB people. We searched Medline, Embase, PsycInfo, Cinahl, the Cochrane Library Database, the Web of Knowledge, the Applied Social Sciences Index and Abstracts, the International Bibliography of the Social Sciences, Sociological Abstracts, the Campbell Collaboration and grey literature databases for articles published January 1966 to April 2005. We also used Google and Google Scholar and contacted authors where necessary. We searched all terms related to homosexual, lesbian and bisexual people and all terms related to mental disorders, suicide, and deliberate self harm. We included papers on population based studies which contained concurrent heterosexual comparison groups and valid definition of sexual orientation and mental health outcomes.ResultsOf 13706 papers identified, 476 were initially selected and 28 (25 studies) met inclusion criteria. Only one study met all our four quality criteria and seven met three of these criteria. Data was extracted on 214,344 heterosexual and 11,971 non heterosexual people. Meta-analyses revealed a two fold excess in suicide attempts in lesbian, gay and bisexual people [pooled risk ratio for lifetime risk 2.47 (CI 1.87, 3.28)]. The risk for depression and anxiety disorders (over a period of 12 months or a lifetime) on meta-analyses were at least 1.5 times higher in lesbian, gay and bisexual people (RR range 1.54–2.58) and alcohol and other substance dependence over 12 months was also 1.5 times higher (RR range 1.51–4.00). Results were similar in both sexes but meta analyses revealed that lesbian and bisexual women were particularly at risk of substance dependence (alcohol 12 months: RR 4.00, CI 2.85, 5.61; drug dependence: RR 3.50, CI 1.87, 6.53; any substance use disorder RR 3.42, CI 1.97–5.92), while lifetime prevalence of suicide attempt was especially high in gay and bisexual men (RR 4.28, CI 2.32, 7.88).ConclusionLGB people are at higher risk of mental disorder, suicidal ideation, substance misuse, and deliberate self harm than heterosexual people.

Prevalence of common mental disorders in general practice attendees across Europe.

BACKGROUND There is evidence that the prevalence of common mental disorders varies across Europe. AIMS To compare prevalence of common mental disorders in general practice attendees in six European countries. METHOD Unselected attendees to general practices in the UK, Spain, Portugal, Slovenia, Estonia and The Netherlands were assessed for major depression, panic syndrome and other anxiety syndrome. Prevalence of DSM-IV major depression, other anxiety syndrome and panic syndrome was compared between the UK and other countries after taking account of differences in demographic factors and practice consultation rates. RESULTS Prevalence was estimated in 2,344 men and 4,865 women. The highest prevalence for all disorders occurred in the UK and Spain, and lowest in Slovenia and The Netherlands. Men aged 30-50 and women aged 18-30 had the highest prevalence of major depression; men aged 40-60 had the highest prevalence of anxiety, and men and women aged 40-50 had the highest prevalence of panic syndrome. Demographic factors accounted for the variance between the UK and Spain but otherwise had little impact on the significance of observed country differences. CONCLUSIONS These results add to the evidence for real differences between European countries in prevalence of psychological disorders and show that the burden of care on general practitioners varies markedly between countries.

Problems with sexual function in people attending London general practitioners: cross sectional study.

Abstract Objectives To assess sexual behaviour, prevalence of ICD-10 diagnosed sexual dysfunction, associations between sexual and psychological problems, and help seeking for sexual problems in people attending general practice; to assess predictors of ICD-10 diagnosis of sexual dysfunction. Design Cross sectional study. Setting 13 general practices in London. Participants 1065 women and 447 men attending general practices. Main outcome measure Prevalence and predictors of ICD-10 diagnoses of sexual dysfunction. Results 97 (22%, 95% confidence interval 18% to 25%) men and 422 (40%, 37% to 43%) women received at least one ICD-10 diagnosis, but only 3-4% had an entry relating to sexual problems in their general practice notes. The most common problems were erectile failure and lack or loss of sexual desire in men and lack or loss of sexual desire and failure of orgasmic response in women. Increasing age and being unemployed predicted sexual problems in women, and bisexual orientation, being non-white, and being unemployed were demographic predictors in men. No practice note factors predicted sexual problems in women, but high consulting rate predicted problems in men. The main clinical predictors were poor physical function and dissatisfaction with current sex life in both sexes and higher psychological morbidity in women. When all factors were considered, increasing age (odds ratio 1.01, 1.00 to 1.02), physical subscale score on the SF-12 (0.98, 0.97 to 0.99), sexual dissatisfaction (1.9, 1.5 to 2.4), and scoring over a 3/4 threshold score on the general health questionnaire (1.5, 1.1 to 1.9)independently predicted an ICD-10 sexual dysfunction diagnosis in women. Being bisexual (4.1, 1.3 to 12.8) was the only independent predictor of an ICD-10 diagnosis in men. Conclusions Sexual difficulties are common in people attending general practitioners, and many people are prepared to talk about them with their doctors.

Accuracy of diagnosis of psychosis on general practice computer system.

OBJECTIVES--To determine the accuracy of diagnoses of schizophrenia and non-affective psychosis entered by general practitioners on a computer system. To compare recording of clinical events on computer with written records. DESIGN--Examination of case notes of all patients with a computer diagnosis of psychosis. Search of 8000 randomly selected patient records to identify patients with psychosis not recorded on computer and comparison of 141 computer and written entries for prescribing and consultation in each practice. SETTING--13 London practices on the VAMP research bank. MAIN OUTCOME MEASURES--Accuracy of record of psychosis compared with ICD 9, American Psychiatric Association diagnostic manual, and syndrome checklist criteria. RESULTS--Computer search revealed 102 patients with schizophrenia, 78 with other psychoses, and 71 with non-affective psychosis who had adequate case notes. The sensitivity and positive predictive value of the computer diagnosis of schizophrenia were 88% (95% confidence interval 62% to 98%) and 71% (48% to 88%). For all non-organic psychoses sensitivity was 91% (74% to 97%) and positive predictive value was 91% (74% to 98%). On average 95% of all known prescriptions and 74% of all consultations were recorded on computer compared with 42% and 75% in written records. CONCLUSIONS--Recording of psychotic illness on the VAMP computer is accurate and complete. Prescribing was more fully recorded on the computer than on the written records. Computer databases of well motivated general practitioners could be used for research.

Self-Reported Long-Term Needs After Stroke

Background and Purpose— Development of interventions to manage patients with stroke after discharge from the hospital requires estimates of need. This study estimates the prevalence of self-reported need in community-dwelling stroke survivors across the United Kingdom. Methods— We conducted a survey of stroke survivors 1 to 5 years poststroke recruited through Medical Research Council General Practice Research Framework general practices and 2 population-based stroke registers. Levels and type of need were calculated with comparisons among sociodemographic groups, disability level, and cognitive status using the &khgr;2 test or Fisher exact test, as appropriate. Results— From 1251 participants, response rates were 60% (national sample) and 78% (population registers sample) with few differences in levels of reported need between the 2 samples. Over half (51%) reported no unmet needs; among the remainder, the median number of unmet needs was 3 (range, 1 to 13). Proportions reporting unmet clinical needs ranged from 15% to 59%; 54% reported an unmet need for stroke information; 52% reported reduction in or loss of work activities, significantly more from black ethnic groups (P=0.006); 18% reported a loss in income and 31% an increase in expenses with differences by age, ethnic group, and deprivation score. In multivariable analysis, ethnicity (P=0.032) and disability (P=0.014) were associated with total number of unmet needs. Conclusions— Multiple long-term clinical and social needs remain unmet long after incident stroke. Higher levels of unmet need were reported by people with disabilities, from ethnic minority groups, and from those living in the most deprived areas. Development and testing of novel methods to meet unmet needs are required.

Physical activity, dietary habits and Coronary Heart Disease risk factor knowledge amongst people with severe mental illness - A cross sectional comparative study in primary care

BackgroundEvidence regarding Coronary Heart Disease (CHD) related lifestyle in people with severe mental illnesses (SMI) such as schizophrenia is sparse. We aimed to quantify adverse CHD knowledge, diet and exercise in a representative primary care sample, and to determine whether socio-economic deprivation explained any findings.MethodWe compared CHD lifestyle and CHD knowledge in 74 people with SMI and 148 without from seven general practices. We measured CHD knowledge, dietary fibre, fats and exercise using validated instruments and adjusted for socio-economic status.ResultsFewer people with SMI had higher CHD knowledge: OR 0.49 (95% CI: 0.27–0.88), higher total exercise scores 0.49 (0.27–0.86), higher fibre 0.46 (0.26–0.82) or lower saturated fat diets 0.53 (0.30–0.94). These results were stable irrespective of antipsychotic medication, socio-economic status or type of statistical analysis.ConclusionHigh fat, low fibre diets, lack of exercise and smoking are the likely causes of the majority of CHD in this high-risk group, irrespective of medication and socio-economic deprivation. This lifestyle and particularly the lower CHD knowledge provides a theoretical focus for more comprehensive preventative CHD interventions in SMI.

Survival of people with clinical diagnosis of dementia in primary care: cohort study

Objectives To estimate survival after a diagnosis of dementia in primary care, compared with people without dementia, and to determine incidence of dementia. Design Cohort study using data from The Health Improvement Network (THIN), a primary care database. Setting 353 general practices in the United Kingdom providing data to THIN. Participants All adults aged 60 years or over with a first ever code for dementia from 1990 to 2007 (n=22 529); random sample of five participants without dementia for every participant with dementia matched on practice and time period (n=112 645). Main outcome measures Median survival by age and sex; mortality rates; incidence of dementia by age, sex, and deprivation. Results The median survival of people with dementia diagnosed at age 60-69 was 6.7 (interquartile range 3.1-10.8) years, falling to 1.9 (0.7-3.6) years for those diagnosed at age 90 or over. Adjusted mortality rates were highest in the first year after diagnosis (relative risk 3.68, 95% confidence interval 3.44 to 3.94). This dropped to 2.49 (2.29 to 2.71) in the second year. The incidence of recorded dementia remained stable over time (3-4/1000 person years at risk). The incidence was higher in women and in younger age groups (60-79 years) living in deprived areas. Conclusions Median survival was much lower than in screened populations. These clinically relevant estimates can assist patients and carers, clinicians, and policy makers when planning support for this population. The high risk of death in the first year after diagnosis may reflect diagnoses made at times of crisis or late in the disease trajectory. Late recording of diagnoses of dementia in primary care may result in missed opportunities for potential early interventions.

Relative risk of diabetes, dyslipidaemia, hypertension and the metabolic syndrome in people with severe mental illnesses: Systematic review and metaanalysis

BackgroundSevere mental illnesses (SMI) may be independently associated with cardiovascular risk factors and the metabolic syndrome. We aimed to systematically assess studies that compared diabetes, dyslipidaemia, hypertension and metabolic syndrome in people with and without SMI.MethodsWe systematically searched MEDLINE, EMBASE, CINAHL & PsycINFO. We hand searched reference lists of key articles. We employed three search main themes: SMI, cardiovascular disease, and each cardiovascular risk factor. We selected cross-sectional, case control, cohort or intervention studies comparing one or more risk factor in both SMI and a reference group. We excluded studies without any reference group. We extracted data on: study design, cardiovascular risk factor(s) and their measurement, diagnosis of SMI, study setting, sampling method, nature of comparison group and data on key risk factors.ResultsOf 14592 citations, 134 papers met criteria and 36 were finally included. 26 reported on diabetes, 12 hypertension, 11 dyslipidaemia, and 4 metabolic syndrome. Most studies were cross sectional, small and several lacked comparison data suitable for extraction. Meta-analysis was possible for diabetes, cholesterol and hypertension; revealing a pooled risk ratio of 1.70 (1.21 to 2.37) for diabetes and 1.11 (0.91 to 1.35) of hypertension. Restricting SMI to schizophreniform illnesses yielded a pooled risk ratio for diabetes of 1.87 (1.68 to 2.09). Total cholesterol was not higher in people with SMI (Standardized Mean Difference -0.10 (-0.55 to 0.36)) and there were inconsistent data on HDL, LDL and triglycerides with some, but not all, reporting lower levels of HDL cholesterol and raised triglyceride levels. Metabolic syndrome appeared more common in SMI.ConclusionDiabetes (but not hypertension) is more common in SMI. Data on other risk factors were limited by poor quality or inconsistent research findings, but a small number of studies show greater prevalence of the metabolic syndrome in SMI.

The risk for depression conferred by stressful life events is modified by variation at the serotonin transporter 5HTTLPR genotype: evidence from the Spanish PREDICT-Gene cohort

We report results from the PREDICT-Gene case-control study nested in a prospective cohort designed to identify predictors of the onset of depression among adult primary-care attendees. We tested the potential gene-by-environment interaction between 5HTTLPR genotype at the serotonin transporter gene and previous exposure to threatening life events (TLEs) in depression. A total of 737 consecutively recruited participants were genotyped. Additional information was gathered on exposure to TLEs over a 6-month period, socio-demographic data and family history of psychological problems among first-degree relatives. Diagnoses of depression were ascertained using the Composite International Diagnostic Interview (CIDI) by trained interviewers. Two different depressive outcomes were used (ICD-10 depressive episode and ICD-10 severe depressive episode). Both the s/s genotype and exposure to increasing number of TLEs were significantly associated with depression. Moreover, the 5HTTLPR s/s genotype significantly modified the risk conferred by TLEs for both depressive outcomes. Thus, s/s homozygous participants required minimal exposure to TLE (1 TLE) to acquire a level of risk for depression that was only found among l/s or l/l individuals after significantly higher exposure to TLEs (two or more TLEs). The interaction was more apparent when applied to the diagnosis of ICD-10 severe depressive episode and after adjusting for gender, age and family history of psychological problems. Likelihood ratios tests for the interaction were statistically significant for both depressive outcomes (ICD-10 depressive episode: LR X2=4.7, P=0.09 (crude), LR-X2=6.4, P=0.04 (adjusted); ICD-10 severe depressive episode: LR X2=6.9, P=0.032 (crude), LR-X2=8.1, P=0.017 (adjusted)).