Age at menarche is associated with prediabetes and diabetes in women (aged 32-81 years) from the general population: the KORA F4 Study

AIMS/HYPOTHESIS

The aim of this study was to examine the association between age at menarche and prediabetes as well as diabetes, considering confounding factors and the possible mediating role of adult obesity.

METHODS

This cross-sectional study analysed data on 1,503 women aged 32-81 years from the German population-based KORA (Cooperative Health Research in the Region of Augsburg, South Germany) F4 Study (2006-2008). Data were collected by standardised interviews, physical examinations, and whole blood and serum measurements, including administration of an OGTT in non-diabetic participants.

RESULTS

Of the 1,503 women, 226 showed a prediabetic state (impaired fasting glucose and/or impaired glucose tolerance) and 140 persons had diabetes (45 participants with previously undiagnosed diabetes and 95 with known diabetes). In Poisson regression analysis, age at menarche was significantly inversely associated with prediabetes or diabetes after adjustment for year of birth (RR 0.88; 95% CI 0.82, 0.94, p < 0.0001 per additional year of menarche) and after additional adjustment for a number of confounding factors (RR 0.88; 95% CI 0.83, 0.94, p = 0.0001). Further adjustment for current BMI slightly attenuated the association with prediabetes or diabetes (RR 0.89; 95% CI 0.83, 0.95, p = 0.0009), but the association remained clearly significant.

CONCLUSIONS/INTERPRETATION

Age at menarche seems to be inversely associated with prediabetes and diabetes independent of confounding factors including current BMI. Women at risk for diabetes might be identified by a history of young age at menarche.

Patient-reported symptoms in acute myocardial infarction: differences related to ST-segment elevation: the MONICA/KORA Myocardial Infarction Registry

OBJECTIVES

The early recognition of symptoms of myocardial infarction (MI) is crucial for patients with both ST-segment elevation (STEMI) and non-STEMI (NSTEMI). However, to date, only a few studies have examined the differences between patients with STEMI and NSTEMI with regard to the range of presenting MI symptoms.

DESIGN

The study population comprised 889 individuals with STEMI and 1268 with NSTEMI, aged 25-74, hospitalized with a first-time MI between January 2001 and December 2006 recruited from a population-based MI registry. The occurrence of 13 symptoms was recorded during a standardized patient interview.

RESULTS

Patients with STEMI were significantly younger, more likely to be smokers and less likely to have a history of hypertension or sleep disturbances prior to the acute MI (AMI) event than those with NSTEMI. A total of 50% of the patients attributed their experienced symptoms to the heart. Logistic regression modelling revealed that patients with STEMI were significantly more likely than patients with NSTEMI to complain of vomiting [odds ratio (OR) 2.34, 95% confidence interval (CI) 1.76-3.05], dizziness (OR 1.63, 95% CI 1.30-2.03) and diaphoresis (OR 1.49, 95% CI 1.23-1.81). Furthermore, patients with STEMI were less likely to experience dyspnoea (OR 0.81, 95% CI 0.68-0.98) or pain in the throat/jaw (OR 0.80, 95% CI 0.66-0.98).

CONCLUSIONS

Only half of all patients correctly attributed their symptoms to the heart. Patients with STEMI and NSTEMI showed differences regarding several presenting symptoms. Further research is needed to replicate our results, and public awareness of AMI symptoms needs to be improved.

Prediction models for incident type 2 diabetes mellitus in the older population: KORA S4/F4 cohort study

BACKGROUND

The aim was to derive Type 2 diabetes prediction models for the older population and to check to what degree addition of 2-h glucose measurements (oral glucose tolerance test) and biomarkers improves the predictive power of risk scores which are based on non-biochemical as well as conventional clinical parameters.

METHODS

Oral glucose tolerance tests were carried out in a population-based sample of 1353 subjects, aged 55-74 years (62% response) in Augsburg (Southern Germany) from 1999 to 2001. The cohort was reinvestigated in 2006-2008. Of those individuals without diabetes at baseline, 887 (74%) participated in the follow-up. Ninety-three (10.5%) validated diabetes cases occurred during the follow-up. In logistic regression analyses for model 1, variables were selected from personal characteristics and additional variables were selected from routinely measurable blood parameters (model 2) and from 2-h glucose, adiponectin, insulin and homeostasis model assessment of insulin resistance (HOMA-IR) (model 3).

RESULTS

Age, sex, BMI, parental diabetes, smoking and hypertension were selected for model 1. Model 2 additionally included fasting glucose, HbA(1c) and uric acid. The same variables plus 2-h glucose were selected for model 3. The area under the receiver operating characteristic curve significantly increased from 0.763 (model 1) to 0.844 (model 2) and 0.886 (model 3) (P<0.01). Biomarkers such as adiponectin and insulin did not improve the predictive abilities of models 2 and 3. Cross-validation and bootstrap-corrected model performance indicated high internal validity.

CONCLUSIONS

This longitudinal study in an older population provides models to predict the future risk of Type 2 diabetes. The OGTT, but not biomarkers, improved discrimination of incident diabetes.

Prevalence of undiagnosed diabetes and impaired glucose regulation in 35-59-year-old individuals in Southern Germany: the KORA F4 Study

AIMS

Limited data are available for European populations regarding the prevalence of diabetes and disturbed glucose metabolism in younger individuals. Our aim was to estimate the prevalence of diagnosed and undiagnosed diabetes, isolated impaired fasting glucose (i-IFG), isolated impaired glucose tolerance (i-IGT) and combined IFG/IGT in a population-based sample (n = 1653) from Southern Germany aged 35-59 years.

METHODS

Oral glucose tolerance tests were carried out in all non-diabetic participants of the KORA F4 Study (2006-2008). Diabetes, IGT and IFG were defined according to the 1999 World Health Organization diagnostic criteria. The original IFG criteria (6.1-6.9 mmol/l) were used as recommended by the European Diabetes Epidemiology Group.

RESULTS

The age-standardized prevalence was 2.2% for known diabetes, 2.0% for newly detected diabetes, 2.9% for i-IFG, 6.3% for i-IGT and 1.1% for combined IFG/IGT. About half of the cases with overt diabetes were undiagnosed in all age groups. The prevalence of i-IGT was approximately twice as high as that of i-IFG. The proportion of i-IGT varied between 3.2% (age group 35-44 years) and 11.8% (age group 55-59 years); the corresponding numbers for i-IFG were 1.1% and 5.9%. IFG/IGT was present in 1.2% of the total sample, and was most frequently found in the age group 55-59 years (2.4%). Overall, 16% of the study population had either diabetes or abnormalities of glucose metabolism.

CONCLUSIONS

The study reveals for the first time a high prevalence of impaired glucose regulation in the younger and middle-aged German population. The detection of disturbed glucose metabolism or diabetes needs to be improved.

Incidence of Type 2 diabetes in the elderly German population and the effect of clinical and lifestyle risk factors: KORA S4/F4 cohort study

AIMS

To determine the incidence of Type 2 diabetes in an elderly population in Germany and its association with clinical and lifestyle factors.

METHODS

Oral glucose tolerance tests (OGTT, World Health Organization criteria) were carried out in a random sample of 1353 subjects (age group 55-74 years; 62% response) in Augsburg (Southern Germany) (1999-2001). The cohort was re-investigated in 2006-2008. Of those individuals without diabetes (baseline), 887 (74%) participated in the follow-up.

RESULTS

Ninety-three (10.5%) developed diabetes during the 7-year follow-up period {standardized incidence rates [95% confidence interval (CI)] per 1000 person-years: total 15.5; 12.6, 19.1; men 20.2; 15.6, 26.1; women 11.3; 7.9, 16.1}. In both sexes, those who developed diabetes were slightly older, were more obese, had a more adverse metabolic profile (higher glucose values, HbA(1c), fasting insulin, uric acid, and triglycerides) and were more likely to have hypertension at baseline than were participants remaining free of diabetes (P < 0.05). On stepwise logistic regression, age, parental diabetes, body mass index, uric acid, current smoking, HbA(1c) and fasting and 2-h glucose (OGTT) were strong predictors of diabetes incidence. The risk of diabetes was higher in subjects with isolated impaired glucose tolerance (odds ratio 8.8; 95% CI 5.0, 15.6) than in isolated impaired fasting glucose (4.7; 2.2, 10.0), although the difference did not reach statistical significance.

CONCLUSIONS

For the first time, we have estimated the incidence of Type 2 diabetes in an elderly German cohort and demonstrated that it is among the highest in Europe. The OGTT appears to be useful in identifying individuals with high Type 2 diabetes risk. Our results support a role of smoking in the progression to diabetes.

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.

20-year trends in clinical characteristics, therapy and short-term prognosis in acute myocardial infarction according to presenting electrocardiogram: the MONICA/KORA AMI Registry (1985-2004)

OBJECTIVES

To examine the extent to which evidence-based beneficial therapy is applied in practice, whether this is changing over time and is associated with improved outcomes.

BACKGROUND

Randomized trials have proved efficacy of several treatments for acute myocardial infarction (AMI) with ST-elevation (STEMI), non-ST-elevation (NSTEMI) and bundle branch block (BBB).

DESIGN AND SETTING

We prospectively examined all 6748 consecutive patients with AMI aged 25-74 years hospitalized in the study region's major clinic stratified into four time-periods: 1985-1989 (n = 1622), 1990-1994 (n = 1588), 1995-1999 (n = 1450) and 2000-2004 (n = 2088).

RESULTS

The increase in numbers of AMI in the last period was mainly, but not exclusively driven by NSTEMI cases. Evidence-based pharmacological therapy increased steeply over time. Invasive procedures increased mainly in the last period with percutaneous coronary intervention and coronary artery bypass graft performed in 30% and 15% in 1998 and 66.0% and 22%, respectively, in 2004. In-hospital complications and 28-day-case fatality decreased significantly from period 1 to period 4 in all patients with AMI. Marked reductions in 28-day-case fatality were mostly seen in BBB patients during the last period (25.3% vs. 10.3%, P < 0.001). Of interest, the odds in 28-day-case fatality reduction was diminished after correction for recanalization therapy (from 0.35, 95% CI: 0.16-0.74 to 0.52, 95% CI: 0.19-1.45).

CONCLUSIONS

Over the past 20 years, there were substantial changes in pharmacological and interventional therapies in AMI accompanied by reductions in in-hospital complications and 28-day-case fatality in all infarction types with marked reductions in 28-day-case fatality in BBB patients. The latter observation may mainly be because of the increased use of interventional therapy.

Beta-blocker use and risk of fractures in men and women from the general population: the MONICA/KORA Augsburg cohort study

Use of beta-blockers is associated with a reduced risk of fractures in middle-aged and older subjects from the general population.

INTRODUCTION

The present prospective population-based study investigated the association between use of beta-blockers and incidence of any fracture.

METHODS

The study was based on 1,793 persons 55 to 74 years of age who participated in one of the three MONICA Augsburg surveys between 1984 and 1995. Subjects were without any fracture at baseline. Incident fractures were assessed using a health questionnaire. Hazard ratios (HRs) were estimated from Cox proportional hazard models.

RESULTS

During a mean follow-up of 10.7 years, there occurred 263 incident fractures. beta-blocker users were older, were significantly more likely to be obese, to drink no alcohol, to have hypertension or diabetes, to use thiazides and statins, and to be physically inactive. The use of beta-blockers was associated with a lower risk of any fracture (HR 0.57; 95% CI = 0.36-0.90) after adjustment for age, sex and survey. Further adjustment for body mass index and education years only slightly attenuated the relationship (HR 0.60; 95% CI = 0.38-0.95) and additional adjustment for a variety of further risk factors did not attenuate the association (HR 0.60; 95% CI = 0.37-0.96).

CONCLUSION

Use of beta-blockers was associated with a reduced risk of fractures in middle-aged and older subjects from the general population.

Association between the intake of vitamins and trace elements from supplements and C-reactive protein: results of the MONICA/KORA Augsburg study

OBJECTIVE

To examine the association between plasma concentrations of C-reactive protein (CRP) and the intake of vitamins and trace elements from supplements possibly related to inflammation such as vitamin C, vitamin E, carotenoids, selenium and zinc.

DESIGN

Cross-sectional study using data from the Monitoring of Trends and Determinants in Cardiovascular Disease/Cooperative Health Research in the Region of Augsburg (MONICA/KORA) Survey 1994/95.

SETTING

Region of Augsburg, Southern Germany.

SUBJECTS

Population-based sample of 2045 women and 2172 men, aged 25-74 years.

RESULTS

Intake of dietary supplements containing vitamins and trace elements was associated with lower CRP levels in women. Especially vitamin E in combination with other vitamins like vitamin C, vitamin B(1), B(2), B(6), B(12), niacin, folic acid, pantothenic acid and selenium, was significantly associated with lower CRP levels. Odds ratios for elevated CRP levels (>3.0 mg/l) after multivariable adjustment were 0.57 (95% confidence interval (CI): 0.37, 0.89) for the intake of vitamin E and 0.57 (95% CI: 0.35, 0.91) for the intake of multivitamins, defined as taking three or more different vitamins. These associations were not seen in men. Intake of vitamin C, carotenoids or zinc was not significantly associated with levels of CRP in both men and women.

CONCLUSIONS

Our data indicate that the intake of certain vitamins and trace elements from supplements is associated with lower CRP concentrations in women. Thus, intake of these micronutrients could influence the inflammatory process underlying the pathogenesis of atherosclerosis. Specific dose response relationships and the best combinations of vitamins and trace elements have to be determined in further studies.

[Epidemiology of hypertension in Germany. Selected results of population-representative cross-sectional studies]

BACKGROUND AND OBJECTIVES

The mortality rate from cardiovascular disease is higher in northern than southern Germany. To illuminate this further current epidemiological data on arterial hypertension were obtained and compared with previously collected data.

METHODS

The results were based on interview and measurement data of 25- to 64 year-old participants in the Study of Health in Pomerania (SHIP-0 1997 - 2001; n = 3,042), and three population-representative surveys in the region of Augsburg, Southern Germany (MONICA S2 1989/90 n = 3,966; MONICA S3 1994/95 n = 3,916; S4 1999-2001 [KORA-2000 n = 3,464]). Hypertension was defined according to the WHO/ISH guidelines as blood pressure levels of > or =140/90 mmHg or antihypertensive medication given the subjects with known hypertension. Antihypertensive medication was classified as recommended by the German Hypertension Society.

RESULTS

Currently, 57 % (95 % confidence intervall [CI] 54-59 %) of men and 32 % (CI 30-35) of women in Pomerania had hypertension compared to 36 % (CI 34-38 %) and 23 % (CI 21-25 %) in KORA-2000 with some decreases since MONICA S2 und S3. Although a significantly higher prevalence was found in the north than in the south, the medical care was equally poor in both regions: 44-46 % of men and 29-31 % of women were not aware of their hypertension. Among the hypertensives, only 26-31 % of males and 44-48 % of females were being treated for hypertension, mostly with beta blockers, ACE-inhibitors, calcium antagonists, diuretics and AT(1)-antagonists, at least half being given just one of these drugs. Fewer than half of the treated hypertensives were normotensive, regardless of the antihypertensive drug group that was given.

CONCLUSION

As the overall situation regarding the treatment of hypertension remains inadequate, an aggressive approach to applying the evidence-based guidelines is essential. The underlying causes of this unacceptable degree of hypertension control requires further intensive investigation.

Influence of antihypertensive therapy and blood pressure control on left ventricular geometry and function in subjects with type II diabetes: The Augsburg Diabetes Family Study

Cross-sectional data often fail to show beneficial effects of antihypertensive therapy in patients with hypertension. We, therefore, examined the influence of hypertension control on left ventricular (LV) structure in diabetic persons separated into those having and not having any known cardiovascular disease (CVD) symptoms. The study population consisted of 394 subjects with type II diabetes. According to the presence of CVD, subjects were classified as symptomatic (N=181) or asymptomatic (N=213). In addition, three groups were differentiated: controlled hypertensives (CHs), that is, known hypertension with normal blood pressure (BP), uncontrolled hypertensives (UHs), that is, elevated BP regardless of antihypertensive medication, and normotensives (Ns). Symptomatic subjects showed a significantly higher prevalence of LV hypertrophy (LVH) (34.5 vs 23.4%, P<0.02). In contrast to symptomatic subjects where hypertension control status had no further significant impact on LV geometry, a considerable impact on preservation of normal LV geometry was observed in asymptomatic persons (LVH of 30, 15 and 18% in UH, CH and N, respectively, P<0.001). Control of hypertension in early diabetes seems especially to prevent the development of concentric hypertrophy (24 vs 11% in UH vs CH, P<0.04). In conclusion, in subjects with diabetes and CVD, the prevalence of LV structural abnormalities is very high. Although in this population-based study setting, in the latter group BP control does not seem to positively influence LV mass and function, hypertension control in still asymptomatic diabetic persons is beneficial and has a considerable impact on preservation of normal LV geometry.

Serum gamma-glutamyltransferase and risk of type 2 diabetes mellitus in men and women from the general population

OBJECTIVES

To examine gender-specific associations between gamma-glutamyltransferase (GGT) and incident type 2 diabetes mellitus in a representative population-based sample in Germany.

DESIGN

Prospective population-based study.

METHODS

The study was based on 1851 men and 1836 women (aged 25-64 years) who participated in the first Monitoring Trends and Determinants on Cardiovascular Diseases (MONICA) Augsburg Survey 1984/1985, and who were free of diabetes at baseline. Incident cases of type 2 diabetes were assessed using follow-up questionnaires in 1987/1988, 1997/1998 and 2002/2003 and were validated with medical records. Gender-specific hazard ratios (HRs) were estimated from Cox proportional hazard models.

RESULTS

A total of 172 cases of incident type 2 diabetes amongst men and 109 amongst women were registered during a mean follow-up period of 14.7 years. In both sexes the risk of type 2 diabetes increased with increasing levels of serum GGT. After multivariable adjustment HRs for incident type 2 diabetes across GGT categories (<25th, <50th, <75th, <87.5th and > or =87.5th percentiles) were 1.0, 1.81, 2.37, 3.41 and 4.24 (P-value for trend <0.0001) in men and 1.0, 1.42, 1.48, 1.95 and 2.41 (P-value for trend 0.0179) in women. Obesity appeared to be more strongly associated with type 2 diabetes in women with GGT equal or greater than the median compared to women with GGT below the median. However, in men the association between obesity and type 2 diabetes was almost identical in the two groups.

CONCLUSIONS

The GGT is an important predictor for incident type 2 diabetes in men and women from the general population.

[Case-cohort studies: an effective design for the investigation of biomarkers as risk factors for chronic diseases--demonstrated by the example of the MONICA/KORA Augsburg Case-Cohort Study 1984-2002]

As it is often not possible to determine specific measures of exposure in all participants of a prospective cohort study due to financial or other restrictions, new study designs have been developed. The aim of these designs is to obtain valid results even though expensive measurements are restricted to a limited number of participants of the original cohort study. The case-cohort study is a design that has recently become interesting as an alternative to the well known nested case-control study. The following article describes the case-cohort design considering as an example data from the MONICA/KORA Augsburg cohort study 1984-2002 and the outcomes of type 2 diabetes mellitus and acute myocardial infarction. Furthermore, results obtained in the full cohort for selected exposures are compared with results obtained in the case-cohort study.