[Methods of health economic evaluation for health services research]

On August 30, 2010, the German Network for Health Services Research [Deutsches Netzwerk Versorgungsforschung e. V. (DNVF e. V.)] approved the Memorandum III "Methods for Health Services Research", supported by the member societies mentioned as authors and published in this Journal [Gesundheitswesen 2010; 72: 739-748]. The present paper focuses on methodological issues of economic evaluation of health care technologies. It complements the Memorandum III "Methods for Health Services Research", part 2. First, general methodological principles of the economic evaluations of health care technologies are outlined. In order to adequately reflect costs and outcomes of health care interventions in the routine health care, data from different sources are required (e. g., comparative efficacy or effectiveness studies, registers, administrative data, etc.). Therefore, various data sources, which might be used for economic evaluations, are presented, and their strengths and limitations are stated. Finally, the need for methodological advancement with regard to data collection and analysis and issues pertaining to communication and dissemination of results of health economic evaluations are discussed.

Inpatient and outpatient health care utilization of children and adolescents with type 1 diabetes before and after introduction of DRGs

OBJECTIVE

To analyze the frequency and length of hospital stays as well as the frequency of diabetes-associated outpatient visits of children and adolescents with type 1 diabetes before and after the introduction of DRGs (diagnosis-related groups) in German hospitals.

METHODS

For this prospective cohort study, data from 2000 (before introduction of DRGs) to 2008 (after introduction) was extracted from the German diabetes documentation software DPV. Incidence rates of hospitalizations, length of hospital stays as well as the incidence rates of outpatient visits of 21,502 children and adolescents were estimated. The associations between the target parameters and DRG introduction, age, sex, diabetes duration, calendar year and migration background were estimated using generalized linear mixed models.

RESULTS

Incidence of hospitalization was 0.45 (95% CI 0.44-0.45) per person-year (PY), mean number of hospital days 2.77/PY (95% CI: 2.76-2.79). Children had 5.3 (95% CI: 5.3-5.3) outpatient visits per PY on average. The number of hospital stays, inpatient days, and outpatient visits decreased significantly between 2000 and 2008. Time of introduction of DRGs was related to a significant rise in the number of hospital stays and outpatient visits (p<0.05). There was no significant relation to the number of hospital days. Compared with children younger than eleven years of age, 11- to 14-year-old children had significantly more, adolescents older than 14 years significantly less hospital stays (RR 1.2, 95% CI: 1.14-1.23 and 0.92, 95%, CI: 0.87-0.97, respectively). Migration background was significantly associated with worse results for all analyzed target variables (RR 1.21 for hospital stays, 1.26 for hospital days, 1.07 number of outpatient visits).

CONCLUSIONS

The introduction of DRGs in the care of patients with pediatric diabetes mellitus resulted in a leveling of the reduction of the number of outpatient visits and hospital stays. Especially adolescents at the age of puberty and patients from families with migration background seem to require particular attention in health care.

Differences in trends in estimated incidence of myocardial infarction in non-diabetic and diabetic people: Monitoring Trends and Determinants on Cardiovascular Diseases (MONICA)/Cooperative Health Research in the Region of Augsburg (KORA) registry

AIMS/HYPOTHESIS

One major objective of the St Vincent Declaration was to reduce the excess risk of myocardial infarction in patients with diabetes mellitus. We estimated the trend of the incidence and relative risk of myocardial infarction in the diabetic and non-diabetic populations in southern Germany from 1985 to 2006.

METHODS

Using data from the Monitoring Trends and Determinants on Cardiovascular Diseases (MONICA)/Cooperative Health Research in the Region of Augsburg (KORA) Project in southern Germany, we ascertained all fatal and non-fatal first myocardial infarctions between 1985 and 2006 (n = 14,891, age 25-74 years). We estimated the diabetic and the non-diabetic populations using data on diabetes prevalence from surveys, and evaluated incidence of myocardial infarction in the two estimated populations. To test for time trends, we fitted Poisson regression models.

RESULTS

Of individuals with first myocardial infarction, 71% were male and 28% known to have diabetes. In the non-diabetic population, myocardial infarction incidence decreased by about 1.5% to 2.0% per year. A comparable decrease was seen in the population of diabetic women. However, in the population of diabetic men, incidence of myocardial infarction increased by about 1% per year. Over the whole study period, myocardial infarction incidence decreased by 34% and 27% in non-diabetic men and women respectively (RR 0.66, 95% CI 0.59-0.74 and 0.73, 0.62-0.87 respectively). In diabetic women, it decreased by 27% (RR 0.73, 0.61-0.88), whereas in diabetic men, it increased by 25% (RR 1.25, 1.07-1.45).

CONCLUSIONS/INTERPRETATION

Our results suggest that the St Vincent goal of reducing excess cardiovascular morbidity in diabetic individuals has not been achieved and that the situation in men has actually got worse.

Prevalence of known diabetes in German adults aged 25-69 years: results from national health surveys over 15 years

AIMS

The few studies examining the secular trend in diabetes prevalence in Germany have yielded conflicting results. Therefore, using nationally representative samples of adults, we investigated whether the prevalence of known diabetes has changed over 15 years.

METHODS

Study participants were 25- to 69-year-old residents participating in nationally representative health surveys performed in the following time periods: 1990-1992, 1997-1999, 2002-2003, 2003-2004 and 2004-2005. Prevalences of diabetes, standardized to the population structure of 2004, and trends over time were assessed for the total study population as well as by gender and other diabetes-associated factors.

RESULTS

Between 1990-1992 and 2002-2005, no statistically significant trend in the total (5.16 and 5.34%, P trend = 0.68) or sex-specific diabetes prevalence (men: 5.43 and 5.73, P trend = 0.62; women: 4.88 and 4.95%, P trend = 0.94) was observed. For each time period, prevalence rose substantially with increasing age, increasing body mass index, lower sporting activity and lower education.

CONCLUSIONS

Our findings reflect no temporal increase in the total prevalence of known diabetes in German adult men and women. However, prevalence estimates were relatively high when compared with other European studies and call for continued efforts for the prevention and management of diabetes.

Are symptoms of depression more common in diabetes? Results from the Heinz Nixdorf Recall study

AIMS

To estimate the association between depressive symptoms and Type 2 diabetes, as well as previously undetected diabetes, in a large population-based sample in Germany and to determine associated variables.

METHODS

We used baseline data on 4595 participants (age 45-75 years, 50.2% women) from the German Heinz Nixdorf Recall study, a population-based, prospective cohort study which started in 2000. Diabetes mellitus was assessed by self report (physician diagnosis or medication), undiagnosed diabetes based on blood glucose levels. Depressive symptoms were assessed using the Center for Epidemiologic Studies Depression (CES-D) scale short form (cut-off >or= 15 points). We fitted multiple logistic regression models.

RESULTS

The prevalence of diagnosed and previously undetected diabetes was 9.3% (95% confidence interval 8.2-11.6) and 7.6% (6.6-8.8) in men and 6.0% (5.1-7.1) and 3.2% (2.5-4.0) in women, respectively. Compared with non-diabetic women, the prevalence of depressive symptoms was not significantly different in diabetic women (age-adjusted odds ratio, 95% confidence interval 1.48; 0.98-2.24) and women with undiagnosed diabetes (0.67; 0.33-1.36). In men, the prevalence of depressive symptoms tended to be lower in diabetic than in non-diabetic subjects (0.62; 0.35-1.09), but the depressive symptoms were significantly less frequent in men with undiagnosed diabetes (0.30; 0.13-0.70). The pattern remained after further adjustment. Significant associations with depressive symptoms were found for co-morbidities and living without a partner in both women and in men, and for body mass index and activity level in women only.

CONCLUSIONS

After adjustment for relevant covariates, the association between depressive symptoms and Type 2 diabetes was heterogenous in our population-based study. In subjects with undiagnosed diabetes, however, depressive symptoms were less frequent in men. Co-morbidities and psychosocial conditions are strongly associated with depressive symptoms.

Trend of hip fracture incidence in Germany 1995-2004: a population-based study

We analyzed hip fracture incidence trends in Germany 1995-2004, using national hospital discharge register. Crude incidences per 100,000 increased from 121.2 (95% CI 120.5-121.9) in 1995 to 140.9 (140.2-141.7) in 2004. Age-sex-adjusted annual incidence ratios showed a statistically significant, but only slight increase (1.01, p<0.01), compared to higher rises in the past. Trends differed markedly with sex, age, and regions.

INTRODUCTION

Data concerning actual trends of the hip fracture incidence and differences for sex, age, and region are limited. We analyzed hip fracture incidence trends in Germany 1995-2004, using the national hospital discharge register. Crude incidences per 100,000 increased from 121.2 (95% CI 120.5-121.9) in 1995 to 140.9 (140.2-141.7) in 2004. Age-sex-adjusted annual incidence ratios showed a statistically significant, but only slight increase (1.01, p<0.01), compared to higher rises in the past. Trends differed markedly with sex, age, and regions.

METHODS

Analysis of annual hip fracture incidences using the national hospital discharge register. Estimate of age-sex-adjusted changes was found by using Poisson regression (incidence rate ratios, IRR).

RESULTS

The number of patients with at least one hospital admission for hip fracture increased (1995: n=99,141; 2004: n=116,281). Crude incidences per 100,000 were 121.2 (95% confidence interval 120.5-121,9) and 140.9 (140.2-141.7), respectively. The age-sex-adjusted hip fracture incidence increased statistically significantly, but only slightly (IRR per year: 1.01; 1.00-1.01; IRR 1995-2004: 1.05, p<0.01). In men aged 40 years or older, incidences increased. In women, there was a tendency of a decrease up to 74 years of age, but also a significant increase in higher age groups. In people 0-39 years, the incidence declined markedly (IRR 1995-2004, men 0.74; 0.69-0.79, women 0.62; 0.55-0.69, both p<0.01). The increase was significantly higher in Eastern compared to Western Germany (interaction: p=0.002), and differences between East and West decreased.

CONCLUSIONS

In contrast to earlier years, the hip fracture incidence in Germany 1995-2004 increased only slightly, with a decline in younger people, but increases in older ages, particularly in men. Regional differences decreased.

Cost comparison analysis: pentaerythrithyl tetranitrate (PETN) and isosorbide dinitrate (ISDN) prescribed to diabetic patients in primary care practices in Germany

INTRODUCTION

Both pentaerythrithyltetranitrate (Pentalong, PETN) and isosorbide dinitrate (ISDN) are commonly used in the therapy of ischemic heart disease (IHD). However, little is known about the therapeutic patterns in diabetic patients and no comparative data are available regarding the prescription costs of these two substances. Thus, the aim of this investigation was to compare the costs for PETN and ISDN therapy in diabetic patients in primary care.

MATERIAL AND METHODS

All continuously treated patients aged > or = 40 years with diabetes (anti-diabetic agents) and IHD or angina pectoris (ICD codes) and newly started on PETN or ISDN therapy (index date) in the period 2000-2005 were selected from a database containing data from 400 practices throughout Germany (Disease Analyzer, IMS Health). Prescriptions costs for PETN and ISDN, as well as costs for cardiovascular comedication, were determined for the period 183 days before and after the index date, and that changes in costs after the index date were calculated. Differences in costs between the two groups were evaluated using multivariate regression, adjusting for age, sex and comorbidity. Patients in Eastern (n = 137, age 71 +/- 10 years, 55% male) and Western Germany (n = 212, age 73 +/- 9 years, 50% male) were analyzed separately since there is a longer history of PETN use in Eastern Germany.

RESULTS

Significantly more patients were treated with PETN in Eastern Germany (61 vs. 11%, p < 0.05). The patient groups treated with PETN and ISDN differed with respect to sex and comorbidity. PETN therapy was more expensive than ISDN therapy in both German regions (adjusted cost differences were 10 and 17 Euro). However, when comedication was taken into account, a smaller cost increase after the index date was observed in the PETN group than in the ISDN group (non-significant cost savings of 43 and 52 Euro after adjustment for Western and Eastern Germany, respectively).

CONCLUSION

PETN therapy tends to produce a saving in costs compared to ISDN therapy in diabetic patients when costs for comedication are taken into account and after adjustment for age and comorbidity. The prescription patterns in Eastern and Western Germany and the patient characteristics of those receiving PETN and ISDN differed, indicating differences in patients selection and prescribing by physicians in the two regions.

Economics in pediatric type 1 diabetes - results from recently published studies

OBJECTIVE

Type 1 diabetes in childhood is increasing worldwide. Several therapy components and models of pediatric diabetes care have been introduced. Economic aspects are of increasing interest to decide appropriate strategies in clinical practice. However, knowledge in pediatric diabetes is limited.

METHODS

We conducted a literature research to identify and describe systematically recently published analyses on the economics of pediatric diabetes.

RESULTS

We substracted ten analyses. Four were cost of illness studies. The main result is that hospitalization, mainly due to metabolic control, education, and acute complications, seems to be a large cost component. Only one study took the perspective of society, including indirect costs. Four of the six studies which evaluated interventions in pediatric diabetes care focussed on ambulatory or home care strategies. Detailed evaluation of new technologies, pharmacotherapy, or screening for late complications is lacking. Except one, all studies performed cost comparison analyses. Evidence is limited, however, diabetes care models may be effective and, possibly, cost saving compared to routine care.

CONCLUSIONS

Health economic studies in pediatric diabetes are scarse and limited with respect to topics and quality. Hospitalization has a large impact on health care costs in diabetic children and adolescents. Models in pediatric diabetes care like home intervention may be cost effective compared to more traditional strategies of care. However, further studies are warranted which evaluate clinical and cost effectiveness in pediatric diabetes.

[Injury prevention as the physician's challenge]

In Germany, more than 9 million individuals yearly sustain injuries and more than 30,000 fatal injuries. Based on estimations, preventive measures could avoid more than one half of all accidents and could influence the other half of the accidents such that the injuries caused are minor. The aim of an initiative of the Study Group on Injury Prevention of the German Trauma Society (DGU) is a complete inventory of all prevention programs from different expert groups in Germany. A synopsis of the gathered knowledge should serve as a basis for further interdisciplinary preventive measures. The consistent interdisciplinary orientation of this program is a special characteristic including trauma surgery, orthopedics, pediatric surgery, pediatrics, sociology, legal medicine, psychology, sports medicine, geriatrics, anesthesiology, and others. Special attention was also directed to the age groups of children/adolescents and the elderly.

Clinical and cost-effectiveness of primary prevention of Type 2 diabetes in a 'real world' routine healthcare setting: model based on the KORA Survey 2000

AIMS

To analyse the clinical and cost-effectiveness of the primary prevention of Type 2 diabetes in a 'real world' routine healthcare setting using population-based data (KORA Survey in Augsburg, Germany, total population approximately 600,000).

METHODS

Decision analytic model, time horizon 3 years.

INTERVENTIONS

Staff education, targeted screening and lifestyle modification or metformin in people aged 60-74 years with a body mass index of > or = 24 kg/m(2) and prediabetic status (fasting glucose 5.3-6.9 mmol/l and 2-h post load glucose 7.8-11.0 mmol/l) (target population approximately 72,500), according to the Diabetes Prevention Program trial.

MAIN OUTCOME MEASURES

Cases of Type 2 diabetes prevented, cost (Euro), incremental cost-effectiveness ratios (ICERs).

RESULTS

Under model assumptions, 14 908 people in the target population would develop diabetes if there was no intervention, 184 cases would be avoided with lifestyle intervention and 42 cases with metformin intervention. From the perspective of statutory health insurance and society, costs for lifestyle modification were 856,507 euro (574,241 pounds) and 4,961,340 euro (3,326,307 pounds), respectively, and for metformin 797,539 euro (534,706 pounds) and 1,335,204 euro(895,181 pounds). Up to 5% of the costs were due to staff education and up to 36% to screening. Lifestyle was more cost effective than metformin. ICERs for lifestyle vs. 'no intervention' were 4664 euro (3127 pounds) and 27,015 euro (18,112 pounds) per case prevented from the statutory health insurance and societal perspective.

CONCLUSIONS

Total cost and cost per case of diabetes avoided was high. Staff education and screening had a considerable impact. In view of the low participation in a routine healthcare setting, with both strategies only a small number of cases of diabetes would be prevented. Before implementing the programme, efforts should be made to improve patient participation in order to achieve better clinical and cost-effectiveness of the prevention of Type 2 diabetes in 'real world' clinical practice.

Persistent social disparities in the risk of hospital admission of paediatric diabetic patients in Germany-prospective data from 1277 diabetic children and adolescents

BACKGROUND

Reduction of social inequality in health care is a major target in many countries. The risk of hospital admission is thought to be higher in diabetic children from socially deprived families but actual data are lacking.

METHODS

Based on a nationwide prospective computer-based documentation program (DPV), we determined the association between three social parameters (parental professional education, one-parent family vs. complete family, migration background) and the risk for post-onset hospital admission, as well as the number of hospital admission days in children and adolescents < 20 years of age with diabetes onset in 2002-2005 [n = 1277, 56% male, mean age at onset 8.5 (4.1) years]. We estimated relative risks with 95% confidence intervals, adjusting for age, sex, and diabetes centre (cluster), using random effect models.

RESULTS

Forty-two per cent of the study subjects were admitted to hospital at least once during follow-up. The incidence of hospital admissions was 0.46 (0.43-0.49) per person year, and there were 2.72 (2.65-2.80) hospital days per person year. Hospital admissions and hospital days were higher in girls than in boys (significant for hospital days, P < 0.05), and significantly lower in adolescents aged 15-19 compared with children aged 0-4 years (P < 0.05 in all models). Hospital admission rates were significantly higher in children from lower-educated parents, single-parent families, and families with a migration background (all P < 0.05).

DISCUSSION

We found post-onset hospital admission rates to be higher in diabetic children and adolescents from socially deprived families. In comparison with an analysis in the 1990s, no decrease in social disparity in hospital admission risk was found.

Socioeconomic conditions and type 1 diabetes in childhood in North Rhine-Westphalia, Germany

AIMS/HYPOTHESIS

The aim of the study was to investigate the relationships between childhood type 1 diabetes and socioeconomic conditions, which might provide clues to the aetiology of the disease.

MATERIALS AND METHODS

In an ecological study, we investigated the relationships between socioeconomic conditions and the incidence of type 1 diabetes incidence among children aged 0-14 years in North Rhine-Westphalia (NRW), Germany, between 1996 and 2000 at the level of the 33 districts. Incidence data were obtained from the population-based NRW diabetes register and regional socioeconomic data from official statistics. Associations were assessed by Poisson regression models and Bayesian conditionally autoregressive regression models (CAR).

RESULTS

In simple Poisson regression, population density, proportion of non-German nationals in the population, measures of income, education and professional training, and deprivation scores were significantly associated with diabetes risk (p < 0.01). An increase of about one interquartile range (IQR) in population density, proportion of non-German nationals or household income was associated with a 9-12% decrease in diabetes incidence. A rise of about one IQR in income ratio, measures of education and professional training, or in deprivation score (high values correspond to high deprivation) was associated with an 8-12% incidence increase. There was a significantly 'linear' increasing incidence trend across five deprivation classes (relative risk: 1.06; 95% CI: 1.03-1.09). All associations were confirmed when overdispersion and spatial autocorrelation were accounted for in Poisson and CAR models.

CONCLUSIONS/INTERPRETATIONS

The results raise the possibility that the risk for type 1 diabetes is higher for children living in socially deprived and less densely populated areas. Subsequent investigations are necessary to verify the observed ecological relations at the individual level and to identify the causal factors behind the socioeconomic indicators.

Incremental prescription and drug costs during the years preceding diabetes diagnosis in primary care practices in Germany

INTRODUCTION

To evaluate incremental drug prescription costs before diabetes diagnosis in primary care patients in Germany.

MATERIAL AND METHODS

Based on 400 primary care practices throughout Germany (Disease Analyzer, IMS Health, Frankfurt, Germany), we selected only patients receiving continuous treatment (age >or= 40 years) and ascertained drug prescriptions and costs up to 6 years before diabetes was diagnosed. For control, we selected age- and sex-matched nondiabetics (n = 6,294 pairs, age 65.5 +/- 10.5 years, 44 % male). We evaluated incremental prescriptions and costs by calculating differences and ratios between patients with and without a diabetes diagnosis. We also evaluated predictors of cost differences using multivariate regression models. The data used for the evaluation was taken from the period 1993 to 2002.

RESULTS

The mean number of prescriptions in the year preceding diagnosis in men and women increased 15 % and 19 %, respectively (p < 0.001). Prescription costs were 21 % (men) and 28 % (women) higher in subjects who were destined to receive a diabetes diagnosis (269 and 264 Euros per person) compared to controls (p < 0.001). Incremental prescriptions and costs were already present six years preceding diagnosis. Cardiovascular drugs had the largest impact, accounting for about two-thirds of incremental prescriptions and costs. Women had higher numbers of prescriptions and costs, however, differences and ratios were comparable to men. Incremental costs were higher in patients with private compared to statutory health insurance, and in Western compared to Eastern Germany.

DISCUSSION

Numbers of prescriptions and costs in primary care patients with future diabetes diagnosis in Germany were already increased six years before clinical detection, reflecting increased cardiovascular risk even before clinical diabetes diagnosis.

[Quality of care and extent of complications in a population-based sample of patients with type 2 diabetes mellitus. The KORA Survey 2000]

BACKGROUND AND OBJECTIVE

The aim of this study was to analyse health care processes and outcomes in type 2 diabetes in a representative population sample of persons, aged 25-74 years, in the region of Augsburg, Germany.

PATIENTS AND METHODS

Based on the KORA Survey 2000, indicators of health care services and outcomes were analysed for all study subjects with known type 2 diabetes (n=149; 80 males (54%)) , mean age 62 +/- 9 years; total random population sample: 4,261 persons). Means and prevalences were calculated, including 95% confidence intervals (CI). Associated factors were analysed using multivariate regression models.

RESULTS

57% of the patients had not received adequate drug treatment concerning hypertension and 43% concerning hypercholesterolemia. 63% (CI: 54-70 %) and 38% (CI: 30-47%), respectively, reported that their eyes or feet had been examined during the past 12 months. 47% (CI: 39-56%) had been instructed about their diabetes. 69% (CI: 61-76%) of the subjects did not know the term "HbA(1c)", the proportion being higher among subjects without diabetes education or those of a low social status. 13% (CI: 8-20%) of the subjects had been told by their medical practitioner that they had a retinopathy, 5% (CI: 2- 10%) a foot ulcer, 19% (CI: 12-28%) proteinuria. Two persons were blind, one had been on renal dialysis, and 5% (CI: 2-10%) had undergone amputation of a limb. 6% (3-12%) had at least one of the end-stage diabetic complications. The mean HbA(1c) was 7.2 +/- 1.6%, significantly higher in those with a diabetes for >10 years.

CONCLUSIONS

The population-based data regarding indicators of type 2 diabetes care processes and outcome in a defined region in Germany show that the treatment of hypertension and hypercholesterolemia was highly inappropriate, as was the frequency of medical control investigations. The high proportion of subjects who did not know the term "HbA(1c)" was striking, particularly among those of a low social status. A significant proportion had severe late complications. The mean HbA(1c), however, was better than had been reported in some previous German practice-based studies.

Cost-Effectiveness of Type 2 Diabetes Screening: Results from Recently Published Studies

Type 2 diabetes screening is recommended by various international diabetes associations. We conducted a literature research to identify and describe systematically recently published cost effectiveness analyses (CEA) for type 2 diabetes screening. Three analyses were included. One of them was conducted in Germany, based on the data of the KORA survey S4 (1999/2001). Two studies came from the US. The German as well as one of the US studies evaluated cost per detected diabetic case as main outcome. In contrast to the US study, the German study considered incomplete participation in the screening programs as baseline case. HbA1 c testing combined with the oral glucose tolerance test (OGTT) was more expensive than OGTT or fasting glucose testing, but also most effective in detecting cases, due to high participation in this screening strategy. The second US study investigated the lifetime cost effectiveness of type 2 diabetes screening, based on a Markov model to calculate cost per quality-adjusted life year (QALY). Effectiveness data were derived from two large intervention studies in clinically diagnosed (not identified by screening) diabetic subjects. The authors conclude that type 2 diabetes screening is cost effective, in particular targeted screening in elderly hypertensive subjects. Diabetes screening may be cost effective. However, the effectiveness of early detection and treatment of type 2 diabetes has not yet been shown, and data regarding the course of early detected diabetes are lacking so far. In the future, the most important question is whether type 2 diabetes screening and early treatment is effective with respect to clinical outcomes.

Sex differences in the associations of socioeconomic status with undiagnosed diabetes mellitus and impaired glucose tolerance in the elderly population: the KORA Survey 2000

BACKGROUND

Sex differences in the associations of socioeconomic status (SES) with prevalence of undiagnosed diabetes mellitus, impaired glucose tolerance (IGT) and known risk factors of type 2 diabetes mellitus were investigated in an elderly population.

METHODS

Oral glucose tolerance tests were carried out in 1354 randomly selected subjects (697 men, 657 women) aged 55-74 years in the population-based KORA Survey 2000, Augsburg, Germany. Odds ratios (ORs) and 95% confidence intervals (CIs) for undiagnosed diabetes or IGT by education, occupation and income were estimated using logistic regression controlling for age, waist circumference, blood pressure, triglycerides, physical activity, smoking and alcohol intake.

RESULTS

All three SES variables were significantly inversely related to body mass index, waist circumference and low physical activity in women (P < 0.05). In men, these associations were weaker or absent. Using the lowest category as reference, occupational status was significantly associated with undiagnosed diabetes in women (adjusted OR 0.5; 95% CI 0.3-0.8) after controlling for risk factors in multivariate regression. The OR was also reduced with higher income in women (adjusted OR, diabetes: 0.7; 95% CI 0.5-1.03). Among men, no significant relations of the SES indicators with unknown diabetes were observed. However, the odds of having IGT was lower with higher occupational status in men (adjusted OR 0.7; 95% CI 0.5-0.9).

CONCLUSIONS

Undiagnosed type 2 diabetes was related to low SES defined by occupation or income in women only. In men, low occupational status was independently associated with higher IGT risk. Educational level was not related to glucose disorders in both sexes in the elderly population.

The Diabetes Epidemic in the Elderly Population in Western Europe: Data from Population-Based Studies

Valid epidemiologic data on type 2 diabetes in the elderly population are scarce in the European Region despite its enormous human and economic burden. The aim was to assess population-based data on type 2 diabetes and impaired glucose regulation (IGR) from surveys carried out in Western Europe since 1990 using oral glucose tolerance tests, and to discuss the possible impact of risk factors on geographic variation, in particular, obesity and physical activity. In the decade below 60 years of age, about 10 % of the population had known or newly diagnosed diabetes in European surveys. In the age group 70 to 79 years, average total diabetes prevalence was about one quarter. IGR prevalences also increased with age, reaching a maximum of 25 % (men) to 30 % (women) above 70 years of age. There was a wide variation of total diabetes prevalence in the elderly population in Western European countries, however, without clear geographical pattern. Whereas age- and sex-specific prevalences for total diabetes in the German KORA Survey S4 (1999/2001) (Augsburg) were comparable to the European average, IGR prevalences were higher in Augsburg (60-69 years: KORA: men: 30.2 %, women: 22.4 % Europe: men: 21.2 %, women: 19.0 %). Thus, there is a huge reservoir for future diabetes cases in the elderly population in Germany. Differences at the population level were found for obesity, nutrition, and sedentary lifestyle in Western Europe. Comparative studies on the predictive values of obesity, physical activity, and nutrition and possible interactions with genetic markers in European populations are of interest in the future.

Direct Costs of Pediatric Diabetes Care in Germany and Their Predictors

INTRODUCTION

Cost-of-illness study to evaluate diabetes-related direct costs for the care of diabetic children and adolescents in Germany from the perspective of the statutory health insurance.

MATERIAL AND METHODS

For all continuously treated patients < 20 years of age from 89 pediatric departments (n = 6437, 52 % male, mean age 12.5 [SD 3.8], diabetes duration 5.2 [3.3] years), diabetes-related hospitalization, ambulatory care, insulin management, glucose self measurement, and treatment with antihypertensive drugs in 2000 were ascertained, as well as metabolic control (HbA1c). Costs per patient-year were calculated in Euros (EUR) based on year 2000 prices. Using multivariate regression, the associations between costs and age, sex, diabetes duration, and metabolic control were evaluated.

RESULTS

Mean total costs per patient-year were EUR 2611 (interquartile range 1665 - 2807). Blood glucose self measurement, hospitalization, and insulin accounted for 37 %, 26 %, and 21 % of the costs, respectively, followed by ambulatory care (9 %), injection equipment and glucagon sets (7 %), and treatment with antihypertensive drugs (0.1 %). The total costs were significantly increased for higher age, longer diabetes duration, and higher HbA1c (p < 0.01). The costs for hospitalization were significantly associated with pubertal age (10 - 14 years) and poor metabolic control (HbA1c SDS > 5) (p < 0.001). Based on the present estimations, the total direct costs for the care of all diabetic subjects in Germany < 20 years would be EUR 66.8 (95 % CI 65.4 - 68.1) million in 2000.

DISCUSSION

Among the direct medical costs of childhood diabetes, the highest economic burden was due to glucose self measurement, hospitalization, and insulin. The costs were considerably higher in adolescents with poor metabolic control, especially the costs for hospitalization. Outpatient education programs in pediatric diabetes care, in particular targeting children with poor metabolic control, should be encouraged, including their evaluation with respect to cost and effectiveness.

High prevalence of undiagnosed diabetes mellitus in Southern Germany: target populations for efficient screening. The KORA survey 2000

AIMS/HYPOTHESIS

To estimate the prevalence of undiagnosed diabetes mellitus, impaired glucose tolerance (IGT) and impaired fasting glucose (IFG), and their relations with cardiovascular risk factors in the general population aged 55 to 74 years in Southern Germany.

METHODS

Oral glucose tolerance tests were carried out in a random sample of 1353 subjects aged 55 to 74 years participating in the KORA (Cooperative Health Research in the Region of Augsburg) Survey 2000. Prevalences of glucose tolerance categories (1999 WHO criteria) were adjusted for sample probabilities. The numbers needed to screen (NNTS) to identify one person with undiagnosed diabetes were estimated from age-adjusted logistic regression models.

RESULTS

Sample design-based prevalences of known and unknown diabetes, IGT, and IFG were 9.0%, 9.7%, 16.8%, 9.8% in men, and 7.9%, 6.9%, 16.0%, 4.5% in women, respectively. In both sexes, participants with undiagnosed diabetes had higher BMI, waist circumference, systolic blood pressure, triglycerides, uric acid, and lower HDL-cholesterol than normoglycaemic subjects. A combination of abdominal adiposity, hypertension, and parental diabetes in men resulted in a NNTS of 2.9 (95%CI: 2.0-4.6). In women, the combination of increased triglycerides, hypertension and parental diabetes history yielded a NNTS of 3.2 (95%CI: 2.2-5.1).

CONCLUSION/INTERPRETATION

About 40% of the population aged 55 to 74 years in the Augsburg region have disturbed glucose tolerance or diabetes. Half of the total cases with diabetes are undiagnosed. Cardiovascular risk factors worsen among glucose tolerance categories, indicating the need for screening and prevention. Screening for undiagnosed diabetes could be most efficient in individuals with abdominal adiposity (men), hypertriglyceridaemia (women), hypertension, and parental diabetes history.

Incidence and prevalence of childhood type 1 diabetes mellitus in Germany--model-based national estimates

Fitting a Poisson model to national data on the incidence of type 1 diabetes mellitus (T1DM) under 5 years (1993-95) and to age-specific incidence data from three different German regions (age groups 0-4, 5-9, 10-14, 15-19 years, 1988-1995), national age-specific incidences of T1DM in childhood were estimated. From these the age-standardized national incidence and prevalence were derived for age groups 0-15 and 0-19 years. In 1993-95 the age-standardized national incidences (95% CIs) in the age groups 0-14 and 0-19 years were 14.2 (12.9-15.5) and 17.0 (15.2-18.8) per 100,000 person-years, respectively. The respective national prevalences were 86.7 (83.4-90.0) and 140.2 (134.3-146.1) per 100,000 persons. These estimates of the national incidence and prevalence of T1DM for the mid-1990s were about twofold higher than estimates from the former Eastern Germany in the late 1980s. This striking high frequency of T1DM in Germany has an important impact on clinical and economic aspects of diabetes care in childhood and adolescence.