Smartphone-assisted training with education for patients with hip and/or knee osteoarthritis (SmArt-E): study protocol for a multicentre pragmatic randomized controlled trial.

INTRODUCTION: Hip and knee osteoarthritis are associated with functional limitations, pain and restrictions in quality of life and the ability to work. Furthermore, with growing prevalence, osteoarthritis is increasingly causing (in)direct costs. Guidelines recommend exercise therapy and education as primary treatment strategies. Available options for treatment based on physical activity promotion and lifestyle change are often insufficiently provided and used. In addition, the quality of current exercise programmes often does not meet the changing care needs of older people with comorbidities and exercise adherence is a challenge beyond personal physiotherapy. The main objective of this study is to investigate the short- and long-term (cost-)effectiveness of the SmArt-E programme in people with hip and/or knee osteoarthritis in terms of pain and physical functioning compared to usual care. METHODS: This study is designed as a multicentre randomized controlled trial with a target sample size of 330 patients. The intervention is based on the e-Exercise intervention from the Netherlands, consists of a training and education programme and is conducted as a blended care intervention over 12 months. We use an app to support independent training and the development of self-management skills. The primary and secondary hypotheses are that participants in the SmArt-E intervention will have less pain (numerical rating scale) and better physical functioning (Hip Disability and Osteoarthritis Outcome Score, Knee Injury and Osteoarthritis Outcome Score) compared to participants in the usual care group after 12 and 3 months. Other secondary outcomes are based on domains of the Osteoarthritis Research Society International (OARSI). The study will be accompanied by a process evaluation. DISCUSSION: After a positive evaluation, SmArt-E can be offered in usual care, flexibly addressing different care situations. The desired sustainability and the support of the participants' behavioural change are initiated via the app through audio-visual contact with their physiotherapists. Furthermore, the app supports the repetition and consolidation of learned training and educational content. For people with osteoarthritis, the new form of care with proven effectiveness can lead to a reduction in underuse and misuse of care as well as contribute to a reduction in (in)direct costs. TRIAL REGISTRATION: German Clinical Trials Register, DRKS00028477. Registered on August 10, 2022.

Data linkage of German statutory health insurance claims data and care needs assessments preceding a population-based cohort study on nursing home admission.

OBJECTIVES: We perform and evaluate record linkage of German Care Needs Assessment (CNA) data to Statutory Health Insurance (SHI) claims data. The resulting dataset should enable the identification of factors in healthcare predicting the time between the onset of long-term care dependency and the admission to a nursing home in Germany in subsequent analyses. DESIGN: A deterministic record linkage was conducted using the key variables region, sex, date of birth and care level. In further steps, the underlying cause of care dependency (International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10)) was added for a higher level of distinction. Before linkage, the suitability of the two datasets for these procedures was assessed. After linkage, the results of each stage were analysed and the resulting dataset was evaluated cross-sectionally with respect to bias generated through this process. SETTING: The study comprises data from the German SHI and Statutory Long-Term Care Insurance. PARTICIPANTS: The study cohort comprised 158 069 individuals who became care dependent in 2006. We obtained CNA data for the year 2006 including 188 935 individuals. RESULTS: We could link CNAs to 66 310 individuals of the original study cohort, corresponding to 42.0%. Records from two federal states could not be matched due to missing data. Linkage rates were lower where more people shared the same attributes. The resulting dataset showed minor differences regarding age, sex and care level compared to the original cohort. CONCLUSIONS: Data linkage between German SHI claims data and CNA data is feasible. Failure to link was mostly attributable to a lack of distinction between individuals using available identifiers. The resulting dataset contains relevant information from both health services provision and functional status of care dependent people and is suitable for further analyses with critical reflection of representativity.

The influence of primary care quality on nursing home admissions in a multimorbid population with and without dementia in Germany: a retrospective cohort study using health insurance claims data.

BACKGROUND: Multimorbidity poses a challenge for high quality primary care provision for nursing care-dependent people with (PWD) and without (PWOD) dementia. Evidence on the association of primary care quality of multimorbid PWD and PWOD with the event of a nursing home admission (NHA) is missing. This study aimed to investigate the contribution of individual quality of primary care for chronic diseases in multimorbid care-dependent PWD and PWOD on the duration of ongoing residence at home before the occurrence of NHA. METHODS: We conducted a retrospective cohort study among elderly care-dependent PWD and PWOD in Germany for six combinations of chronic diseases using statutory health insurance claims data (2007-2016). Primary care quality was measured by 21 process and outcome indicators for hypertension, diabetes, depression, chronic obstructive pulmonary disease and heart failure. The primary outcome was time to NHA after initial onset of care-dependency. Multivariable Cox proportional hazard models were used to compare the time-to-event between PWD and PWOD. RESULTS: Among 5876 PWD and 12,837 PWOD 5130 NHA occurred. With the highest proportion of NHA for PWD with hypertension and depression and for PWOD with hypertension, diabetes and depression. Average duration until NHA ranged from 6.5 to 8.9 quarters for PWD and from 9.6 to 13.5 quarters for PWOD. Adjusted analyses show consistent associations of the quality of diabetes care with the duration of remaining in one's own home regardless of the presence of dementia. Process indicators assessing guideline-fidelity are associated with remaining in one's home longer, while indicators assessing complications, such as emergency inpatient treatment (HR = 2.67, 95% CI 1.99-3.60 PWD; HR = 2.81, 95% CI 2.28-3.47 PWOD) or lower-limb amputation (HR = 3.10, 95% CI 1.78-5.55 PWD; HR = 2.81, 95% CI 1.94-4.08 PWOD) in PWD and PWOD with hypertension and diabetes, increase the risk of NHA. CONCLUSIONS: The quality of primary care provided to care-dependent multimorbid PWD and POWD, influences the time individuals spend living in their own homes after onset of care-dependency before a NHA. Health care professionals should consider possibilities and barriers of guideline-based, coordinated care for multimorbid care-dependent people. Further research on quality indicator sets that acknowledge the complexity of care for multimorbid elderly populations is needed.

[Predictors of Admission to Nursing Home in Care-Dependent People - A Longitudinal Secondary Data Analysis]. / Prädiktoren für den Eintritt in ein Pflegeheim bei bestehender Pflegebedürftigkeit ­ Eine Sekundärdatenanalyse im Längsschnittdesign.

OBJECTIVE: To determine predictors of admission to nursing home by means of secondary data analysis of German statutory health insurance claims data and care needs assessments. MATERIALS AND METHODS: A retrospective longitudinal analysis was conducted covering the period 2006-2016 and using routine data. Health insurance data and care needs assessment data for people who became care dependent in 2006 and who lived in their own homes were merged. Cox regression analyses were conducted to identify predictors of admission to a nursing home. RESULTS: The study population comprised 48,892 persons. Dementia, cancer of the brain, cognitive impairment, antipsychotics prescriptions, hospitalized fractures, hospital stays over ten days, and higher age had the highest hazard ratios among the predictors. CONCLUSIONS: Knowledge about the predictors serves to sensitize health care professionals in the care of people in need of care. It facilitates identification of care needs in community-dwelling persons at an increased risk of admission to a nursing home.

Exercise-Based Cardiac Rehabilitation: Secondary Data Analyses of Mortality and Working Capacity in Germany, 2010-2017.

BACKGROUND: Exercise-based cardiac rehabilitation is safe and implemented in international cardiac rehabilitation guidelines. Evidence for long-term health effects is scarce and rare for health care service research. OBJECTIVE: The aim of this study is to evaluate the effectiveness of exercise-based phase III cardiac rehabilitation programs in improving mortality and working capacity outcomes. METHODS: The present analyses used claims data of the German pension fund from 2010 to 2017. Overall, 54,163 patients with coronary heart disease (ICD10 I20.-I25.) were included and followed up for exercise-based cardiac rehabilitation participation (mean 4.3 ± 1.9 years). All patients were categorized according to participation duration (long: ≥ 90 days, short: < 90 days, no). The effectiveness of exercise-based rehabilitation was analyzed by calculating adjusted hazard ratios for mortality and reduced working capacity in relation to program participation. RESULTS: Of all the cardiac patients, 57.6% received medical recommendations for exercise-based phase III rehabilitation, and 16.8% participated in this rehabilitation. In total, 1776 (3.3%) patients died during the study period, and 3050 (5.5%) received reduced earning capacity pensions. Mortality risk was nearly doubled for those who did not participate in exercise-based cardiac rehabilitation compared to those who participated for a long duration (HR 1.97, 95% CI 1.60-2.43) and 44% higher compared to a short participation (HR 1.44, 95% CI 1.03-2.01). Furthermore, the risk of reduced working capacity was higher for those who did not participate compared to those who participated for a short duration (HR 1.24, 95% CI 1.00-1.54). CONCLUSION: Exercise-based phase III cardiac rehabilitation is independently associated with reduced mortality and reduced loss in working capacity. Strong efforts should be made to increase participation rates to improve cardiac patients care.

Differences in nursing home admission between functionally defined populations in Germany and the association with quality of health care.

BACKGROUND: People prefer to age in place and not move into a nursing home as long as possible. The prevention of cognitive and functional impairments is feasible to support this goal. Health services play a key role in providing support for underlying medical conditions. We examined differentials in nursing home admissions between patient sharing networks in Germany and whether potential variations can be attributed to indicators of health care provision. METHODS: We conducted an ecological study using data of patients of 65 years and above from all 11 AOK statutory health insurance companies in Germany. Nursing home admissions were observed in a cohort of persons becoming initially care-dependent in 2006 (n = 118,213) with a follow-up of up to 10 years. A patient sharing network was constructed and indicators for quality of health care were calculated based on data of up to 6.6 million patients per year. Community detection was applied to gain distinct patient populations. Analyses were conducted descriptively and through regression analyses to identify the variation explained by included quality indicators. RESULTS: The difference in the proportion of nursing home admissions between identified clusters shows an interquartile range (IQR) of 12.6% and the average time between onset of care-dependency and admission to a nursing home an IQR of 10,4 quarters. Included quality indicators attributed for 40% of these variations for the proportion of nursing home admissions and 49% for the time until nursing home admission, respectively. Indicators of process quality showed the single highest contribution. Effects of single indicators were inconclusive. CONCLUSIONS: Health services can support persons in their preference to age in place. Research and discussion on adequate health care for care-dependent persons and on conditions, where nursing home admission may be beneficial, is necessary.

Good Practice Data Linkage (GPD): A Translation of the German Version.

The data linkage of different data sources for research purposes is being increasingly used in recent years. However, generally accepted methodological guidance is missing. The aim of this article is to provide methodological guidelines and recommendations for research projects that have been consented to across different German research societies. Another aim is to endow readers with a checklist for the critical appraisal of research proposals and articles. This Good Practice Data Linkage (GPD) was already published in German in 2019, but the aspects mentioned can easily be transferred to an international context, especially for other European Union (EU) member states. Therefore, it is now also published in English. Since 2016, an expert panel of members of different German scientific societies have worked together and developed seven guidelines with a total of 27 practical recommendations. These recommendations include (1) the research objectives, research questions, data sources, and resources; (2) the data infrastructure and data flow; (3) data protection; (4) ethics; (5) the key variables and linkage methods; (6) data validation/quality assurance; and (7) the long-term use of data for questions still to be determined. The authors provide a rationale for each recommendation. Future revisions will include new developments in science and updates of data privacy regulations.

[Quality of ambulatory medical care in the context of age and care-dependency: Results of a cross-sectional analysis of German health claims data]. / Ambulante Versorgungsqualität im Kontext von Alter und Pflegebedürftigkeit ­ Ergebnisse einer Querschnittsanalyse von GKV-Routinedaten aus Deutschland.

BACKGROUND AND AIM: Care-dependent community dwelling people are vulnerable to deficits in medical care provided by the German statutory health insurance (GKV). Quality of care indicators (QIs) contribute to the identification of deficits and of potential for the optimization of care. To investigate the discriminatory ability of QIs in a population of elderly people with and without care dependency and different age structures, insights into the feasibility of such QIs based on health claims data are of interest. The aim of this study is an explorative approach to health claims based QIs for the ambulatory medical care of care-dependent elderly which can be used to optimize health care processes. METHODS: This cross-sectional study used anonymised health claims data of a sample of statutory health insurance members from all German federal states of the year 2016. The sample consisted of 5,934,986 insured persons aged 65 years or older, who were community dwelling with (n = 785,135) or without care-dependency (n = 4,799,369) or who were residents of a nursing home (n = 350,482). 47 QIs focusing on ambulatory care-sensitive conditions such as, asthma, chronic obstructive pulmonary disease, cardiovascular diseases, diabetes mellitus type 2 and depression were calculated on a quarterly basis and are reported descriptively as the arithmetic mean of four quarters stratified by place of residence and age group. RESULTS: The majority of QI values vary between the observed groups with an overarching trend to the disadvantage of older individuals. Even though care-dependent insured persons show higher prevalence rates of the underlying diagnoses of the QIs (except for asthma diagnoses), they score more detrimental QI values than those without care-dependency. This finding holds true after stratification by age group. DISCUSSION: This study describes differences in the quality of medical care for elderly people. Considering prior empirical evidence of deficits in medical care, factors that act as barriers or facilitators of guideline-oriented medical care need to be investigated. The contribution of patients' preferences, access to medical care or prioritisation by medical and nursing care providers when initiating diagnostic or therapeutic procedures remains unclear. Methodical limitations of this study notably derive from the selection process of the observed groups using two stratification variables. For the further development of QIs other influencing factors on both an individual and a population-related level as well as the providers' ability to influence these factors need to be taken into account and incorporated in a risk-adjusted description of QIs. CONCLUSION: Measurement of ambulatory medical care of an elderly population based on health claims data is feasible and shows differences in care processes of older and care-dependent individuals if place of residency and level of care-dependency are considered. Further development of the QIs explored should incorporate a thorough methodical foundation, particularly with regard to risk adjustment. In addition, the contribution of individual and contextual factors on QIs remains to be examined with a view to the community-dwelling care-dependent elderly and their ongoing residency in this setting.

[Influencing factors for nursing home admission in case of pre-existing need of care - a systematic review]. / Einflussfaktoren für einen Heimeintritt bei bestehender Pflegebedürftigkeit ­ eine systematische Übersichtsarbeit.

INTRODUCTION: Knowledge about predictors of nursing home placement is highly relevant. If they are known, targeted interventions such as counselling can help prevent or delay relocation to a nursing home. Above all, preventive and structural measures can target influenceable predictors. The aim of the review was to map predictors of nursing home admission and thus the permanent stay in inpatient long-term care for the target group of people with a pre-existing need for care. METHODS: A systematic literature search in the databases The Cochrane Library, PubMed, CINAHL, GeroLit and CareLit® was conducted in September 2017. Longitudinal studies with quantitative analyses were included. The methodological quality was assessed using the Newcastle-Ottawa Scale. RESULTS: 45 cohort studies were included. 21 studies examined study populations with need for care, in 24 studies the care status was unclear. A variety of predictors of nursing home admission with at least one-and-a-half times higher risk for both study populations could be identified, including higher age, dementia, underweight, higher age of caregiver, psychiatric symptoms, smoking status, ethnicity, challenging behaviour in people with dementia, higher number of hospitalizations and lower level of life satisfaction. DISCUSSION: All the predictors identified are relevant to people in need of care. No predictors for the study population with need of care could be identified that are particularly important in contrast to persons with an unclear care status. However, the quality of studies among people with care and support needs is limited compared to studies targeting people with unclear care status. CONCLUSIONS: Many factors seem to predict the admission to a nursing facility. For the first time, these factors are listed in this systematic review for the target group of people in need of care. Interventions or preventive measures based on known influenceable predictors can help prevent or delay nursing home admission.

[Good Practice Data Linkage]. / Gute Praxis Datenlinkage (GPD).

Individual data linkage of different data sources for research purposes is being increasingly used in Germany in recent years. However, generally accepted methodological guidance is missing. The aim of this article is to define such methodological standards for research projects. Another aim is to provide readers with a checklist for critical appraisal of research proposals and articles. Since 2016, an expert panel of members of different German scientific societies have worked together and developed 7 guidelines with a total of 27 practical recommendations. These recommendations include (1) research aims, questions, data sources and resources, (2) infrastructure and data flow, (3) data privacy, (4) ethics, (5) key variables and type of linkage, (6) data validation/quality assurance and (7) long-term use for future research questions. The authors provide a rationale for each recommendation. Future revisions will include any new developments in science and data privacy.

[A systematic review on population-based indicators of the quality of care in formal and informal provider networks and their application in health economic evaluations]. / Systematische Literaturübersicht zu populationsbasierten Indikatoren der Versorgungsqualität in formalen und informellen Versorgungsnetzwerken und deren Einsatz in gesundheitsökonomischen Evaluationen.

BACKGROUND: Provider networks in healthcare can emerge as either formal or informal networks. For sector-encompassing population-based quality measurement in informal networks, which allows for conclusions about the cost-effectiveness of care for home-dwelling persons in need of care, a comprehensive review on suitable quality indicators that can be derived from German social health insurance claims data is still lacking. OBJECTIVE: Primary review questions: Which population-based indicators of quality of care in formal and informal provider networks are described in the international literature? Which of these indicators are used as outcome parameters in health economic evaluations, and what are the methodological approaches in these evaluations? Rating approaches and methods for establishing thresholds as well as the validity and suitability of quality indicators to predict quality of care as well as the potential for the calculation of quality indicators based on German social health insurance claims data are included in the secondary review questions. SEARCH METHODS: Databases searched in May 2017 and July 2018 included PubMed, The Cochrane Library und NHS EED, CINAHL, GeroLit and EconLit. In addition, we hand-searched references of the studies identified and screened the project database Health Services Research Germany. SELECTION CRITERIA: Quantitative design, German or English language. Any kind of formal or informal network for which distinct members regarding single providers are named and population-based quality indicators for adults (18 years or older) are described. DATA COLLECTION AND ANALYSIS: Two authors (Cohen's Kappa = 0.64) independently screened titles, abstracts and full texts. A third independent reviewer was consulted in cases of uncertainty regarding the inclusion of studies. Critical appraisal was conducted using AMSTAR, the Cochrane Risk-of-Bias Tool, the Newcastle-Ottawa Scale (NOS), the Appraisal Tool for Cross-Sectional Studies (AXIS) and the criteria of the Drummond Checklist. MAIN RESULTS: 137 studies were included, five of which evaluated informal provider networks and applied indicators for medical conditions such as diabetes mellitus or heart failure or events like ambulatory care-sensitive hospitalisations, which were also utilized for formal networks. Five out of 14 health economic evaluations also assessed associations between costs and quality of care. The majority of studies did not include evidence on rating approaches and/or thresholds. Even though the validity and reliability of the used data in single studies is frequently discussed, only one in four of the included studies undertook a discussion of the suitability of the applied indicators. 121 studies explored indicators that can, in whole or in part, potentially be calculated on the basis of German social health insurance claims data and that target medical conditions such as osteoarthritis, asthma, chronic pain, chronic obstructive pulmonary disease, cardiovascular disease, dementia, diabetes mellitus, osteoporosis or mental health disorders as well as ambulatory care-sensitive events, appropriate medication of the elderly and polypharmacy, preventive care and continuity of care. AUTHORS' CONCLUSIONS: This systematic review identified quality indicators that were predominantly used in formal provider networks and, with sufficient testing and further development, include the possibility of being used for measuring the quality of care in informal networks. The need for further research on suitable approaches to measure the interactions of quality of care and costs and on the validity, reliability and predictive suitability of single indicators as well as the finding that quality indicators especially developed for the German ambulatory sector were rarely used in the included studies constitute promising starting points for both an intensified methodological debate and the critical discussion of issues concerning population-based, sector-encompassing measurement of quality of care in health services research.

[Appropriateness of physiotherapy care in Germany: a scoping review]. / Bedarfsgerechtigkeit in der physiotherapeutischen Versorgung in Deutschland ­ ein Scoping Review.

BACKGROUND: Physiotherapy is applied for various indications in practices, hospitals and rehabilitation facilities and should be delivered according to the patients' needs. Empirical knowledge on the appropriateness of physiotherapy care in Germany is scarce. This scoping review aims to give an overview over the evidence base, to describe the results of previous studies and to evaluate the appropriateness of physiotherapy care. METHOD: A systematic literature search was conducted in the databases PubMed, CINAHL, LIVIO and SPOLIT. Results were synthesized in a quantitative and qualitative narrative review. RESULTS: The screening of 1,517 publications yielded 30 studies eligible for inclusion. The included studies encompass 16 different indications. The number of patients with appropriate physiotherapy care varies between indications (from 3 % for urinary incontinence up to 72 % for osteoporosis). DISCUSSION: The review shows a lack of empirical evidence since sufficient empirical findings regarding the appropriateness of physiotherapy care are missing for many of the indications, in particular on physiotherapy in hospitals and rehabilitation facilities. The results of single studies are limited by insufficient assessment of therapeutic needs or the therapy modalities applied. Analyses which encompass multiple settings and/or providers of care have not been conducted in all studies, even though respective approaches would have been suitable. Nevertheless, suggestions for targeted improvement of the appropriateness of physiotherapy care can be derived from the results.

[Impact of quality measurement, transparency and peer review on in-hospital mortality - retrospective before-after study with 63 hospitals]. / Der Einfluss von Qualitätsmessung, Transparenz und Peer Reviews auf die Krankenhaussterblichkeit ­ Retrospektive Vorher-Nachher-Studie mit 63 Kliniken.

BACKGROUND: In 2008 the 'Initiative Qualitätsmedizin' (initiative for quality in medical care, IQM) was established as a voluntary non-profit association of hospital providers of all kinds of ownership. Currently, about 350 hospitals from Germany and Switzerland participate in IQM. Member hospitals are committed to a quality strategy based on measuring outcome indicators using administrative data, peer review procedures to improve medical quality, and transparency by public reporting. This study aims to investigate whether voluntary implementation of this approach is associated with improvements in medical outcome. METHODS: Within a retrospective before-after study 63 hospitals, which started to participate in IQM between 2009 and 2011, were monitored. In-hospital mortality in these hospitals was studied for 14 selected inpatient services in comparison to the German national average. The analyses examine whether in-hospital mortality declined after participation of the studied hospitals in IQM, independently of secular trends or deviations in case mix when compared to the national average, and whether such findings were associated with initial hospital performance or peer review procedures. RESULTS: Declining in-hospital mortality was observed in hospitals with initially subpar performance. These declines were statistically significant for treatment of myocardial infarction, heart failure, pneumonia, and septicemia. Similar, but statistically non-significant trends were observed for nine further treatments. Following peer-review procedures significant declines in in-hospital mortality were observed for treatments of myocardial infarction, heart failure, and pneumonia. Mortality declines after peer reviews regarding stroke, hip fracture and colorectal resection were not significant, and after peer reviews regarding mechanically ventilated patients no changes were observed. CONCLUSION: The results point to a positive impact of the quality approach applied by IQM on clinical outcomes. A more targeted selection of hospitals to be peer-reviewed might further enhance the impact of this approach.

How does age affect the care dependency risk one year after stroke? A study based on claims data from a German health insurance fund.

BACKGROUND: The objective of this study is to investigate the effect of age on care dependency risk 1 year after stroke. Two research questions are addressed: (1) How strong is the association between age and care dependency risk 1 year after stroke and (2) can this association be explained by burden of disease? METHODS: The study is based on claims data from a German statutory health insurance fund. The study population was drawn from all continuously insured members with principal diagnoses of ischaemic stroke, hemorrhagic stroke, or transient ischaemic attack in 2007 who survived for 1 year after stroke and who were not dependent on care before their first stroke (n = 2864). Data were collected over a 1-year period. People are considered to be dependent on care if they, due to a physical, mental or psychological illness or disability, require substantial assistance in carrying out activities of daily living for a period of at least 6 months. Burden of disease was assessed by stroke subtype, history of stroke, comorbidities as well as geriatric multimorbidity. Regression models were used for data analysis. RESULTS: 21.6 % of patients became care dependent during the observation period. Post-stroke care dependency risk was significantly associated with age. Relative to the reference group (0-65 years), the odds ratio of care dependency was 11.30 (95 % CI: 7.82-16.34) in patients aged 86+ years and 5.10 (95 % CI: 3.88-6.71) in patients aged 76-85 years. These associations were not explained by burden of disease. On the contrary, age effects became stronger when burden of disease was included in the regression model (by between 1.1 and 28 %). CONCLUSIONS: Our results show that age has an effect on care dependency risk that cannot be explained by burden of disease. Thus, there must be other underlying age-dependent factors that account for the remaining age effects (e.g., social conditions). Further studies are needed to explore the causes of the strong age effects observed.

Achieving minimum caseload requirements--an analysis of hospital discharge data from 2005-2011.

BACKGROUND: The German Federal Joint Committee (the highest decision-making body of physicians and health insurance funds in Germany) has established minimum caseload requirements with the goal of improving patient care. Such requirements have been in place for five types of surgical procedure since 2004 and were introduced for total knee endoprosthesis surgery in 2006 and for the care of low-birth-weight neonates (weighing less than 1250 g) in 2010. METHOD: We analyzed data from German nationwide DRG statistics (DRG = diagnosis-related groups) for the years 2005-2011. The procedures that were performed were identified on the basis of their operation and procedure codes, and the low-birth-weight neonates on the basis of their birth weight and age. The treating facilities were distinguished from one another by their institutional identifying numbers, which were contained in the DRG database. RESULTS: In 2011, there were 172 838 hospitalizations to which minimum caseload requirements were applicable. 4.5% of these took place in institutions that did not meet the minimum requirement for the procedure in question. The percentage of institutions that did not meet the minimum caseload requirement for complex pancreatic surgery fell significantly from 64.6% in 2006 to 48.7% in 2011, and the percentage of pancreatic surgery cases treated in such institutions fell over the same period from 19.0% to 11.4%. A significant reduction in the number of institutions treating low-birth-weight neonates was already evident before minimum caseload requirements were introduced. For all other types of procedure subject to minimum caseload requirements, there has been no significant change either in the percentage of institutions meeting the requirements or in the percentage of cases treated in such institutions. CONCLUSION: After taking account of the potential bias due to the identification of institutions by their institutional identifying numbers, we found no discernible effect of minimum caseload requirements on care structures over the seven-year period of observation, with the possible exception of a mild effect on pancreatic procedures.