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Biomedical subjects

M Höfler

Publications and source records attributed to M Höfler.

At least 19 recordsLinked to original sources
PubMed2005

Causal inference based on counterfactuals.

BACKGROUND: The counterfactual or potential outcome model has become increasingly standard for causal inference in epidemiological and medical studies. DISCUSSION: This paper provides an overview on the counterfactual and related approaches. A variety of conceptual as well as practical issues when estimating causal effects are reviewed. These include causal interactions, imperfect experiments, adjustment for confounding, time-varying exposures, competing risks and the probability of causation. It is argued that the counterfactual model of causal effects captures the main aspects of causality in health sciences and relates to many statistical procedures. SUMMARY: Counterfactuals are the basis of causal inference in medicine and epidemiology. Nevertheless, the estimation of counterfactual differences pose several difficulties, primarily in observational studies. These problems, however, reflect fundamental barriers only when learning from observations, and this does not invalidate the counterfactual concept.

Causality↗
PubMed2005

[Prevalence and pharmacotherapy of diabetes mellitus in primary care].

BACKGROUND AND OBJECTIVE: So far only incomplete epidemiological data on the management of diabetes mellitus have been available for the Federal Republic of Germany. It was the aim of this study to obtain such information from a representative cross-section of patients. PATIENTS AND METHODS: 43549 consecutive, unselected patients (52.6% females; mean age 64.9 +/- 11.7 years) of general practitioners and internists in private practice were included in this study which was based on data provided by the general practitioners or internists during September 2001. They recorded prevalence of diabetes, hypertension and 22 other diseases, and the patients' current treatment. Also recorded were associations of other patient-related variables (age, gender, associated or resulting diseases, hypertension, micro- and macrovascular complications, obesity), with medical practitioner-related variables (medical training, use of guidelines, regional factors) and with the frequency of antidiabetic treatment (total and differentiated by class of drug). RESULTS: The prevalence of diabetes mellitus in this cohort was 15.6% (18.5% for males and 13.7% for females). 67.6% of the diabetics received antidiabetic medication. There was little difference, between the different age groups and between males and females, with regard to which of the various drugs were prescribed. Patients with macrovascular complications were more intensively treated with antidiabetics than those with exclusively microvascular ones. There was hardly any correlation between patterns of prescription and various practitioner characteristics (medical training, use of guidelines, regional factors). CONCLUSION: There was little differentiation in the prescription of antidiabetic medication by general practitioners/internists among an unselected patient cohort.

Adolescent↗
PubMed2004

Patterns of antihypertensive drug utilization in primary care.

BACKGROUND: In the treatment of hypertension, physicians' attitudes and practice patterns are receiving increased attention as contributors to poor blood pressure (BP) control. Thus, current use of antihypertensive drugs in primary care was analyzed and the association with selected physician and patient characteristics was assessed. METHODS: The Hypertension and Diabetes Risk Screening and Awareness (HYDRA) study is a cross-sectional point prevalence study of 45,125 primary care attendees recruited from a representative nationwide sample of 1912 primary care practices in Germany. Prescription frequencies of the various antihypertensive drugs in the individual patients were recorded by the physicians using standardized questionnaires. We assessed the association of patient variables [age, gender; co-morbidities such as diabetes, nephropathy or coronary heart disease (CHD)] and physician variables (general practitioner vs internist, guideline adherence, etc.) with drug treatment intensity and prescription patterns. RESULTS: Of all 43,549 patients for whom a physician diagnosis on hypertension or diabetes was available, 17,485 (40.1%) had hypertension. Of these hypertensive patients, 1647 (9.4%) received no treatment at all, 1191 (6.8%) received non-pharmacological measures only, and 14,647 (83.8%) were given one or more antihypertensive drugs. Drug treatment rates were lower in young patients (16-40 years: 57.4%). BP control was poor: 70.6% of all patients were not normalized, i.e., had BP >/=140/90 mmHg. Antihypertensive treatment was generally intensified with increasing age, or if complications or comorbidities were present. The use of the different drug classes was rather uniform across the various patient subgroups (e.g., by age and gender). Individualized treatment with regard to co-morbidities as recommended in guidelines was not the rule. Adherence to guidelines as self-reported by physicians as well as other physician characteristics (region, training etc.) did not result in more differentiated prescription pattern. CONCLUSIONS: Despite the broad armamentarium of drug treatment options, physicians in primary care did not treat hypertension aggressively enough. Treatment was only intensified at a late stage, after complications had occurred. Treatment should be more differentiated in terms of coexisting morbidities such as diabetes, nephropathy, or CHD.

Adolescent↗
PubMed2004

Prevalence, co-morbidity and correlates of mental disorders in the general population: results from the German Health Interview and Examination Survey (GHS).

BACKGROUND: The German National Health Interview and Examination Survey (GHS) is the first government mandated nationwide study to investigate jointly the prevalence of somatic and mental disorders within one study in the general adult population in Germany. This paper reports results from its Mental Health Supplement (GHS-MHS) on 4-week 12-month, and selected lifetime prevalence of a broad range of DSM-IV mental disorders, their co-morbidity and correlates in the community. METHODS: The sample of the GHS-MHS (n=4181; multistage stratified random sample drawn from population registries; conditional response rate: 87.6%) can be regarded as representative for the German population aged 18-65. Diagnoses are based on fully structured computer assisted clinical interviews (M-CIDI), conducted by clinically trained interviewers. RESULTS: 12-month prevalence for any DSM-IV study disorder is 31% (lifetime: 43%; 4-week: 20%) with anxiety disorders, mood disorders and somatoform syndromes being the most frequent diagnoses. Retrospective age of onset information reveals that most disorders begin early in life. Co-morbidity rates among mental disorders range from 44% to 94%. Correlates of increased rates of mental disorders and co-morbidity were: female gender (except for substance disorders), not being married, low social class, and poor somatic health status. Health care utilization for mental disorders depended on co-morbidity (30% in 'pure', 76% in highly co-morbid cases) and varied from 33% for substance use disorders to 75% for panic disorder. CONCLUSIONS: Results confirm and extend results from other national studies using the same assessment instruments with regard to prevalence, co-morbidity and sociodemographic correlates, covering a broader range of DSM-IV disorders [i.e. somatoform disorders, all anxiety disorders (except PTSD), mental disorders due to substance or general medical factor, eating disorders]. Intervention rates were higher than in previous studies, yet still low overall.

Adolescent↗
PubMed2004

Recognition and management of overweight and obesity in primary care in Germany.

BACKGROUND: In contrast to the well-documented high prevalence of overweight and obesity in the general population, the prevalence, recognition rates and management by primary care physicians--as the core gatekeeper in the health care system--remains poorly studied. PURPOSE OF THE STUDY: To examine (1) the point prevalence of overweight (BMI 25.0-29.9 kg/m(2)) and obesity (BMI> or =30 kg/m(2)) in primary care patients, (2) prevalence patterns in patients with high-risk constellations (diabetes, hypertension, cardiovascular disease, etc.), (3) doctors' recognition and interventions, as well as patients' use and perceived effectiveness of weight-loss interventions and (4) factors associated with non-treatment. METHODS: Cross-sectional point prevalence study of 45 125 unselected consecutive primary care attendees recruited from a representative nationwide sample of 1912 primary care practices. MEASURES: (1) standardized clinical appraisal of each patient by the physician (diagnostic status and recognition, severity, comorbidity, current and past interventions). (2) Patient self-report questionnaire: height and weight, illness history, past and current treatments and their perceived effectiveness, health attitudes and behaviors. RESULTS: (1) In all, 37.9% of all primary care attendees were overweight, 19.4% obese. (2) Rates for overweight and obesity were highest in patients with diabetes (43.6 and 36.7%) and hypertension (46.1 and 31.3%), followed by patients with cardiovascular disorders. Rates of overweight/obesity increased steadily by the number of comorbid conditions. (3) Doctors' recognition of overweight (20-30%) and obesity (50-65%) was low, patients' actual use of weight control interventions even lower (past 12 months: 8-11%, lifetime: 32-39%). Patient success rates were quite limited. (4) Co- and multimorbidity in particular as well as other patient and illness variables were identified as predictors for recognition, but prediction of patients' actual use of weight loss interventions was limited. CONCLUSIONS: Primary care management of overweight and obesity is largely deficient, predominantly due to four interrelated factors: doctors' poor recognition of patients' weight status, doctors' inefficient efforts at intervention, patients' poor acceptance of such interventions and dissatisfaction with existing life-style modification strategies.

Age Distribution↗
PubMed2003

[Aim, design and methods of the "Hypertension and diabetes screening and awareness" -- (HYDRA) study].

Aim of the study is a comprehensive clinical-epidemiological description of the prevalence of arterial hypertension and diabetes among primary care patients along with an assessment of doctor's recognition rates and prescription behaviour. The paper describes methods and design of the study and provides background information on the sampling process, instruments used as well as characteristics of doctors and patients. The study is based on a nationally representative sample of 1,912 primary care doctors and 45,000 patients that attended the doctors' office on the target days. The patients were also characterized by laboratory tests. The first stage of study consisted of a comprehensive description of the doctors' characteristics in terms of psychosocial, qualification- and provider aspects as well as attitudes towards hypertension and diabetes and their management. In the second stage all patients completed a questionnaire to describe their health behaviour and attitudes as well as the treatment history and therapy. In the third stage all patients were characterized by their doctors in terms of their diagnostic status and their past and current interventions.

Adolescent↗
PubMed2003

[Management of diabetes and hypertension: how do primary care physicians judge their performance?].

With regard to the management of hypertension and diabetes, HYDRA reveals that doctors report multiple problems in their everyday practice. Being confronted with an average of 73 patients a day, with almost every second having either diabetes or hypertension, frequently associated with multiple comorbid conditions, the core obstacle is the time factor. Doctors do not have sufficient time to perform diagnostic tests and especially no time for non-drug interventions of any type. Further available treatment guidelines are only used in 1 out of 2 doctors. Further they seem not to affect doctors performance significantly.

Adult↗
PubMed2003

[Hypertension, diabetes mellitus and comorbidity in primary care].

Almost every second patient seeing a primary care doctor suffers from arterial hypertension and about every fifth has diabetes mellitus. These diseases often occur at the same time. They are associated in more than 80% of the cases with other severe concomitant and subsequent diseases (heart attack, stroke, renal failure, neuropathy etc.). The magnitude especially of subsequent and concomitant diseases, the dimension of the personal suffering and the immense diagnostic and therapeutic challenges for the doctors have been massively underestimated so far. The article informs about the prevalence of the above disease, and structure of the problem. Before the background of an extremely high patient load seen by German General Physicians, the mainstay challenge is highlighted how to achieve further improvements of the quality of care on the basis of scientific guidelines alone, without a concomitant change in the system structure.

Adolescent↗
PubMed2003

Primary anxiety disorders and the development of subsequent alcohol use disorders: a 4-year community study of adolescents and young adults.

BACKGROUND: Cross-sectional findings in community surveys of adults suggest that adolescent anxiety disorders are strong predictors of the subsequent onset of alcohol use, abuse and dependence. However, prospective data that follow a sample of adolescents into adulthood are needed to confirm these associations. METHOD: Baseline and 4-year follow-up data from the EDSP-Study, a prospective community survey of 3021 (2548 at follow-up) adolescents and young adults aged 14 to 24 years at baseline carried out in Munich, were used. DSM-IV anxiety disorders, alcohol use and alcohol use disorders were assessed with the Munich-Composite-International-Diagnostic-Interview (M-CIDI). Multiple logistic regression analysis, controlling for age, gender, other mental disorders, substance use disorders and antisocial behaviour was used to study the associations of baseline anxiety disorders with the subsequent onset and course of alcohol use and alcohol disorders. RESULTS: Baseline social phobia significantly predicts the onsets of regular use and hazardous use and the persistence of dependence. Panic attacks significantly predict the onsets of hazardous use and abuse as well as the persistence of combined abuse/dependence. Panic disorder significantly predicts the persistence of combined abuse/dependence. Other anxiety disorders do not significantly predict any of the outcomes. CONCLUSIONS: Panic and social phobia are predictors of subsequent alcohol problems among adolescents and young adults. Further studies are needed to investigate the underlying mechanisms and the potential value of targeted early treatment of primary panic and social phobia to prevent secondary alcohol use disorders.

Adolescent↗
PubMed2003

Are patients with pituitary adenomas at an increased risk of mental disorders?

OBJECTIVE: Retrospective clinical studies suggest that patients with pituitary adenoma (PA) have an increased risk of mental disorders. However, empirical evidence for this hypothesis is deficient because of out-dated methodology. Therefore, we investigated the occurrence of mental disorders in 93 patients with PA within a limited time frame of 2 years. METHOD: Patients were subjected to a comprehensive, standardized lifetime and cross-sectional psychopathological symptom and diagnostic assessment, including an evaluation of psychosocial conditions and life events (CIDI, SCL-90) during the past years. RESULTS: We could not find an increased risk of mental disorders as compared with a representative population sample of 481 subjects matched by age and gender. CONCLUSION: As for our random sample, neither suffering from any type of PA nor the extent of the pituitary deficiency represent factors having significant effect on the risk of the subject to develop psychopathology as compared with the general population.

Adenoma↗
PubMed2002

[Prevalence, detection and prescribing behavior in depressive syndromes. A German federal family physician study].

This study examines the prevalence of depressive syndromes among unselected primary care patients as well as doctors' recognition and treatment rates. This nationwide study included a total of 20,421 patients attending their primary care doctors (n = 633) on the study's target day. Patients received a self-report questionnaire including the depression screening questionnaire (DSQ) to provide diagnoses of depressive disorders according to the criteria of DSM-IV and ICD-10. These data were compared to the doctor's evaluation form for each patient to assess the physician's diagnostic decision, assessment of clinical severity, and treatment choices. The findings confirm the high prevalence of depressive syndromes in primary care settings (11.3%) and underline the particular challenge posed by a high proportion of patients near the diagnosis threshold. Although recognition rates among more severe major depressive patients (59%) as well as treatments prescribed appear to be more favourable than in previous studies, the situation in less severe cases and the high proportion of doctors' definite depression diagnoses in patients who do not fulfill the diagnostic criteria still raise significant concerns.

Adolescent↗
PubMed2002

Parental alcohol use disorders and alcohol use and disorders in offspring: a community study.

BACKGROUND: We examined the association between parental alcohol use disorders and patterns of alcohol consumption and DSM-IV alcohol use disorders in their offspring in a community-based sample of young adults. METHODS: Data are based on baseline and 4-year follow-up data of 2427 respondents aged 14-24 at baseline. Alcohol use and disorders in respondents were assessed using the Munich-Composite-international-Diagnostic-Interview with DSM-IV algorithms. Diagnostic information about parents was collected by family history information from the respondents, and by direct interview with one parent (cohort aged 14 to 17 years only). RESULTS: Although the association between maternal and paternal alcohol use disorders and non-problematical drinking in offspring was minimal, there was a strong effect for the transition to hazardous use and for alcohol abuse and dependence; the effect of parental concordance for transition into hazardous use was particularly striking. Maternal history was associated with a higher probability of progression from occasional to regular use, whereas paternal history was associated with progression from regular to hazardous use. Parental alcoholism increased the risk for first onset of hazardous use and alcohol dependence between the ages of 14-17, and for an earlier onset of the alcohol outcomes in offspring. The impact of parental alcohol use disorders was comparable for male and female offspring. CONCLUSIONS: Parental alcoholism predicts escalation of alcohol use, development of alcohol use disorders and onset of alcohol outcomes in offspring.

Adolescent↗
PubMed2001

The natural course of cannabis use, abuse and dependence over four years: a longitudinal community study of adolescents and young adults.

OBJECTIVES: To determine incidence and patterns of natural course of cannabis use and disorders as well as cohort effects in a community sample of adolescents and young adults. METHOD: Cumulative incidence and patterns of cannabis use and disorders were examined in a prospective longitudinal design (mean follow-up period=42 months) in a representative sample (N=2446) aged 14-24 years at the outset of the study. Patterns of cannabis use, abuse and dependence (DSM-IV) were assessed with the Composite International Diagnostic Interview (M-CIDI). RESULTS: (1) Cumulative lifetime incidence for cannabis use (at second follow-up): 47%; 5.5% for cannabis abuse, 2.2% for dependence. (2) Men used and abused cannabis more often than women. (3) The majority of the older participants (18-24 years at baseline) had reduced their cannabis use at follow-up, while younger participants (14-17 years at baseline) more often had increased their use and developed abuse or dependence. (4) The younger birth cohort (1977-1981) tended to start earlier with substance (ab)use compared to the older birth cohort (1970-1977). (5) Cannabis use was associated with increasing rates of concomitant use of other licit and illicit drugs. CONCLUSIONS: Cannabis use is widespread in our sample, but the probability of developing cannabis abuse or dependence is relatively low (8%). The natural course of cannabis use is quite variable: about half of all cannabis users stopped their use spontaneously in their twenties, others report occasional or more frequent use of cannabis.

Adolescent↗
PubMed2001

Social anxiety disorder and the risk of depression: a prospective community study of adolescents and young adults.

BACKGROUND: Social anxiety disorder (SAD) (also known as "social phobia") is frequently comorbid with major depression, and in such cases, almost always precedes it. This has led to interest in SAD as a possible modifier of the risk and/or course of mood disorders. METHODS: Data come from a prospective, longitudinal epidemiologic study of adolescents and young adults (aged 14-24 years) in Munich, Germany. Respondent diagnoses (N = 2548) at baseline and follow-up (34-50 months later) are considered. The influence of SAD at baseline on the risk, course, and characteristics of depressive disorders (ie, major depression or dysthymia) at follow-up is examined. RESULTS: The baseline prevalence of SAD was 7.2% (95% confidence interval [CI], 6.1%-8.4%). Social anxiety disorder in nondepressed persons at baseline was associated with an increased likelihood (odds ratio [OR] = 3.5; 95% CI, 2.0-6.0) of depressive disorder onset during the follow-up period. Furthermore, comorbid SAD and depressive disorder at baseline was associated with a worse prognosis (compared with depressive disorder without comorbid SAD at baseline). This is exemplified by the greater likelihood of depressive disorder persistence or recurrence (OR = 2.3; 95% CI, 1.2-4.6) and attempted suicide (OR = 6.1; 95% CI, 1.2-32.2). CONCLUSIONS: Social anxiety disorder during adolescence or young adulthood is an important predictor of subsequent depressive disorders. Moreover, the presence of comorbid SAD in adolescents who are already depressed is associated with a more malignant course and character of subsequent depressive illness. These findings may inform targeted intervention efforts.

Adolescent↗
PubMed2001

Prevalence and recognition of depressive syndromes in German primary care settings: poorly recognized and treated?

The study examines the prevalence of depressive syndromes among unselected primary care attenders, as well as doctors' recognition and treatment rates, in order to examine patient and doctor-related factors associated with poor recognition. This nationwide study included a total of 20421 patients (aged 15-99 years) attending their primary care doctors (n = 633) on the study's target day in April 1999. Patients received a self-report questionnaire, including the Depression Screening Questionnaire (DSQ), to provide diagnoses of depressive disorders according to the criteria of DSM-IV and ICD-10. Doctors completed: (1) a pre-study questionnaire assessing data on doctors' psychosocial, professional and training background, as well as current practices in patients with depression and (2) an evaluation form for each patient seen to assess his diagnostic decision, clinical severity and treatment choices. Taking the DSQ as a yardstick, 4.2% of all primary care attenders fulfilled criteria for a major depressive episode according to DSM-IV; considerably higher rates of 11.3% were obtained using the ICD-10 criteria for mild depressive episodes. Rates of depression were higher in females, increased by age, and were also elevated in those retired, unemployed as well as non-working housemen/wives. Taking the doctors' decision of definite or probable depression, 75% of all DSM and 59% of all ICD-10 diagnoses were recognized by the treating physician. However, doctors also assigned diagnoses of definite depression in an additional 11.7% of patients not meeting either ICD-10 nor DSM-IV criteria. Among correctly identified depression cases doctors decided to prescribe drug treatments in 72.7% (DSM) and 60.8% (ICD). Some 16.2% of DSM and 10.1% of ICD-cases were referred to mental health specialists; non-drug interventions were prescribed for 19.8% (DSM) and 24.9% (ICD), respectively. Multiple logistic regression analyses revealed that recognition is associated with prior treatment episodes, increasing number of depression symptoms, patients higher age, practice experience of treating physician greater 5 years and psychomotor retardation. These findings confirm the high prevalence of depressive syndromes in primary care settings and underline the particular challenge posed by a high proportion of with near-threshold symptomology patients. Although recognition rates among more severe major depressive patients as well as treatments prescribed appear to be more favourable than in previous studies, the situation in less severe cases, and the high proportion of doctors' definite depression diagnoses in patients with depression symptoms that are clearly below even the subthreshold level, raises significant concerns.

Adolescent↗
PubMed2001

[NISAS-2000: The "Nationwide Insomnia Screening and Awareness Study". Prevalence and interventions in primary care].

AIM: To estimate the point prevalence of insomnia, recognition and prescription behavior in primary care. METHODS: Nationwide sample of 539 primary care settings along with their characterization (stage 1). Standardized assessment of all attenders (N = 19.155 patients) on the NISAS target day using a sleep questionnaire (PSQI) and additional questions to cover psychosocial and additional clinical variables. All patients were evaluated by the primary care doctors using a standardized clinical appraisal questionnaire, including a CGI-rating. RESULTS: Prevalence insomnia according to DSM-IV was 26.5%. Recognition of presence of any clinically significant sleep disorder was 72%, recognition of insomnia was poor 54.3%. 85.6% of insomnia patients were rated as chronic. Close to 50% of all insomnia cases did not receive a specific insomnia therapy. Herbals, followed by hypnotics and sedatives and antidepressants were the three most frequent treatments applied, psychotherapy was only seldomly indicated. DISCUSSION: NISAS provides for the first time nationally representative estimates of interventions for insomnia in primary care. The relatively low treatment rates and the high proportion of chronic patients receiving longterm prescription of benzodiazepines seem to be critical. Priorities for future agenda to improve this situation are discussed.

Adolescent↗