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Research

GPs’ awareness of car driving among oldest patients: exploratory results from a primary care cohort

Verena Leve, Michael Pentzek, Angela Fuchs, Horst Bickel, Dagmar Weeg, Siegfried Weyerer, Jochen Werle, Hans-Helmut König, André Hajek, Dagmar Lühmann, Hendrik van den Bussche, Birgitt Wiese, Anke Oey, Kathrin Heser, Michael Wagner, Melanie Luppa, Susanne Röhr, Wolfgang Maier, Martin Scherer, Hanna Kaduszkiewicz, Steffi G Riedel-Heller and for the AgeCoDe/AgeQualiDe Study Group
BJGP Open 2021; 5 (2): BJGPO.2020.0145. DOI: https://doi.org/10.3399/BJGPO.2020.0145
Verena Leve
1 Institute of General Practice (ifam), Medical Faculty, Heinrich Heine University Düsseldorf, Germany
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Michael Pentzek
1 Institute of General Practice (ifam), Medical Faculty, Heinrich Heine University Düsseldorf, Germany
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  • For correspondence: mp@hhu.de
Angela Fuchs
1 Institute of General Practice (ifam), Medical Faculty, Heinrich Heine University Düsseldorf, Germany
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Horst Bickel
2 Department of Psychiatry and Psychotherapy, Klinikum rechts der Isar, Technical University of Munich, Germany
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Dagmar Weeg
2 Department of Psychiatry and Psychotherapy, Klinikum rechts der Isar, Technical University of Munich, Germany
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Siegfried Weyerer
3 Central Institute of Mental Health, Medial Faculty Mannheim/Heidelberg University, Mannheim, Germany
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Jochen Werle
3 Central Institute of Mental Health, Medial Faculty Mannheim/Heidelberg University, Mannheim, Germany
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Hans-Helmut König
4 Department of Health Economics and Health Services Research, Hamburg Center for Health Economics, University Medical Center Hamburg-Eppendorf, Germany
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André Hajek
4 Department of Health Economics and Health Services Research, Hamburg Center for Health Economics, University Medical Center Hamburg-Eppendorf, Germany
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Dagmar Lühmann
5 Department of General Practice/Primary Care, University Medical Center Hamburg-Eppendorf, Germany
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Hendrik van den Bussche
5 Department of General Practice/Primary Care, University Medical Center Hamburg-Eppendorf, Germany
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Birgitt Wiese
6 WG Medical Statistics and IT-Infrastructure, Institute of General Practice, Hannover Medical School (MHH), Hannover, Germany
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Anke Oey
6 WG Medical Statistics and IT-Infrastructure, Institute of General Practice, Hannover Medical School (MHH), Hannover, Germany
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Kathrin Heser
7 Department of Neurodegenerative Diseases and Geriatric Psychiatry, University Hospital Bonn, Germany
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Michael Wagner
7 Department of Neurodegenerative Diseases and Geriatric Psychiatry, University Hospital Bonn, Germany
8 DZNE, German Center for Neurodegenerative Diseases, Bonn, Germany
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Melanie Luppa
9 Institute of Social Medicine, Occupational Medicine and Public Health (ISAP), Medical Faculty, University of Leipzig, Germany
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Susanne Röhr
9 Institute of Social Medicine, Occupational Medicine and Public Health (ISAP), Medical Faculty, University of Leipzig, Germany
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Wolfgang Maier
7 Department of Neurodegenerative Diseases and Geriatric Psychiatry, University Hospital Bonn, Germany
8 DZNE, German Center for Neurodegenerative Diseases, Bonn, Germany
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Martin Scherer
5 Department of General Practice/Primary Care, University Medical Center Hamburg-Eppendorf, Germany
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Hanna Kaduszkiewicz
10 Institute of General Practice, Faculty of Medicine, Kiel University, Kiel, Germany
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Steffi G Riedel-Heller
9 Institute of Social Medicine, Occupational Medicine and Public Health (ISAP), Medical Faculty, University of Leipzig, Germany
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Abstract

Background Increasingly more very old people are active drivers. Sensory, motor and cognitive limitations, and medication can increase safety risks. Timely attention to driving safety in the patient–doctor relationship can promote patient-centred solutions.

Aim To explore the following questions: do GPs know which patients drive a car? Is fitness to drive addressed with patients?

Design & setting Cross-sectional data from patient interviews and GP survey in the ninth follow-up phase of a prospective primary care cohort (the German Study on Ageing, Cognition and Dementia in Primary Care Patients (AgeCoDe) and the Study on Needs, Health Service Use, Costs and Health-Related Quality of Life in a large sample of ‘oldest-old’ primary care patients (≥85 years; AgeQualiDe)) .

Method The sample consisted of patients in the age group ≥85 years and their GPs. Independent reports were gathered on driving activity from the GP and the patient, and information was gained from GPs on whether driving ability was discussed with the patient. Statistical analyses included validity parameters and bivariate characterisation of subgroups (non-parametric significance tests, effect size).

Results Self-reports of 553 patients were available (69.5% female; mean age 90.5 years; 15.9% drive a car). For 427 patients, GP data were also available: GPs recognised 67.1% correctly as drivers and 94.9% as non-drivers. GPs said that they had discussed fitness to drive with 32.1% of potentially driving patients. Among drivers who were not recognised and with whom driving had not been discussed, there were more patients with a low educational level.

Conclusion The GP’s assessment of driving activity among very old patients showed moderate sensitivity and good specificity. Driving ability was seldom discussed. Asking an appropriate question during assessment could increase GPs’ awareness of older patients’ automobility.

  • general practice
  • automobile driving
  • aged, 80 and over
  • physician—patient relations
  • validity
  • clinical decision-making

How this fits in

In Germany, there are no statutory driver safety checks in general practice. Driving has high individual relevance for older people. The results show that GPs are moderately aware of driving among the oldest patients, but seldom address it with patients. A standardised question within the geriatric assessment might enhance GPs’ awareness and communication.

Introduction

In Europe, individual transport has gained significantly in importance over the past years.1 In 2018, travel by car reached 83% of all passenger transport in EU27 member states. For older people, driving is essential for maintaining their individual mobility and autonomy, especially when access to social participation and infrastructure in rural or suburban areas is restricted.2–4

Owing to the trends of the growing proportion of older and very old people in the population in Europe,5 an increase in the number of older drivers can also be expected.1–4 Some European countries, for example, the Netherlands, Ireland, Finland, and Denmark, require driving licence renewal including medical check-ups of fitness to drive based on age limits.6 The majority of European countries rely on the responsibility of drivers and self-regulated driving cessation. In Germany, driving licences are valid for an unlimited period and can only be withdrawn by the responsible authority.6,7 In Germany, GPs are not obliged to assess medical fitness to drive or to report limited driving ability to licensing authorities.6,8 As a matter of principle, a driver is responsible for participating in road traffic only if there are no relevant restrictions on driving ability and other road users are not endangered. However, with increasing multimorbidity, higher age can be associated with reduced driving safety; for example, cognitive limitations can influence reaction times and attention, and physical limitations can affect agility or audio-visual capabilities.9,10 The most common diseases considered to pose risks to driving safety include cardiovascular diseases, dementia, hypertension, diabetes, mental illness, and degenerative joint diseases.9,10 GPs play a major role in the care of patients with multimorbidity and addressing (basic and instrumental) activities of daily living, including mobility issues. Older patients frequently visit general practice and GPs are important contact persons in health and psychosocial matters.11 Although the issue of road safety of older drivers is an established research field,2 little is known about the factors that influence how driving safety issues are addressed with very old patients in general practice in Germany. In this article, the role of GPs in Germany is examined in addressing the issue of driving and recognising risks relevant to driving safety.

The following questions have been answered: (1a) do GPs know which of their very old patients drive a car? (1b) What is the difference between the groups of correctly recognised and overlooked drivers? (2a) Do GPs discuss fitness to drive with their patients? (2b) What is the difference between the groups of patients with whom the GP has spoken about fitness to drive, and those with whom they have not?

Method

Sample

The data presented here were collected within the framework of the studies AgeCoDe and AgeQualiDe. These studies focused on risk factors and diagnosis of dementia and health care of older adults in general. Details of these studies are presented in several publications.12,13 In six study centres (Bonn, Düsseldorf, Hamburg, Leipzig, Mannheim, Munich), 3327 patients from a total of 138 GP practices participated in the baseline study in 2003–2004, based on a random selection of 6619 GP patients. Inclusion criteria were: aged ≥75 years; no dementia diagnosis; and at least one contact with the GP in the past year. Exclusion criteria were: lack of willingness to give consent; insufficient German language skills; not being a regular patient at the practice; sole contact via home visits; living in an old people’s home or nursing home; serious illness that would lead to death within the next 3 months, as assessed by the GP; blindness; and deafness. Patients were assessed by trained scientific interviewers at home in a structured interview including psychometric tests. Independent from this, the GPs of the participating patients provided information, for example about patients’ diseases. Assessments were repeated in intervals of 1.5 years until 2017. Major drop-out reasons in the course of the study were refusal and death. Details on recruitment and participation in the course of the study are published elsewhere.14 As there is a lack of research about it, the topic of driving was explored in the last wave of the survey 2016–2017 (n = 643), only in patients with a Mini Mental Status Examination (MMSE) score15 of at least 19.

Measures of driving activity from the perspective of patients and GPs

Patients were asked by the interviewers about their driving behaviour: 'Do you still drive a car?' (yes or no); if the answer was positive, questions on frequency and distance followed: 'How often do you drive?' (less than once a week, once a week, several times a week, or every day); 'Do you still drive ... ?' ('... only short distances that are necessary [for example, only to the nearest supermarket]' versus ' ... even longer distances [>15 minutes]').

Independently, the GP was asked to rate the patient’s current driving activity: 'Does the patient currently drive a car?' (yes, no, or do not know); in the case of a yes answer, an additional question was asked: 'Have you discussed the topic of fitness to drive with the patient?' (yes or no).

Other variables

With regard to sociodemographic variables, age, sex, living situation (alone versus not alone), and educational status were considered, the latter operationalised according to the Comparative Analysis of Social Mobility in Industrial Nations (CASMIN) classification system (low, medium, high).16 Social network was recorded with the 6-item version of the Lubben Social Network Scale (LSNS;17 score 0–30, higher score = larger social network).

With regard to physical and clinical characteristics, patients were asked about problems with hearing, walking, and seeing (analysed dichotomously). The 15-item version of the Geriatric Depression Scale (GDS)18 was used to measure depressive symptoms (score 0–15, higher score = more depressive symptoms). Global cognitive performance was measured with the MMSE15 (score 0–30, higher scores = better performance). The presence of dementia was investigated with a comprehensive interview and test inventory,19 which combines international dementia criteria in a diagnostic algorithm. This includes testing of cognitive performance, assessment of activities of daily living, and informant reports in case of suspected dementia. Any medical indication of dementia was discussed in consensus conferences with the interviewers and experienced geriatricians or psychiatrists. The medication of patients was assessed directly at the patient’s home. For the purpose of this analysis, all anatomical therapeutic chemical (ATC) codes were determined and compared with the ATC codes on the DRUID list (EU project DRUID: 'Driving under the Influence of Drugs, Alcohol and Medicines').20 It was evaluated whether or not a patient was taking at least one drug in DRUID categories II and III, which are considered to be relevant to driving safety.

Driving behaviour was specified by patients in terms of frequency and distances (as above). As the only independent variable, existing diseases were not recorded at the patient’s home but from the GP (per list of 35 diseases). For the present analyses, the presence of one or more diseases relevant to driving according to the Driving Licence Ordinance7 was derived from this.

Statistical analyses

For question (1a), the validity parameters sensitivity, specificity, and positive and negative predictive value were calculated (reference ‘patient information on driving’) as well as Cohen’s concordance measure ƙ. For question (2a), the percentages of patients with whom the GP discussed or did not discuss fitness to drive are shown.

The analyses for questions (1b) and (2b) were concerned with the bivariate characterisation of two samples (recognised versus unrecognised drivers, and patients with whom the family doctor discussed fitness to drive versus those with whom they did not discuss fitness to drive). Owing to small sample sizes and skewed distributions, non-parametric tests were used here: Mann–Whitney U-tests for continuous and ordinally scaled variables; and χ2 tests for categorical variables. Since the sample size was not planned a priori to answer the mentioned questions (exploratory analysis of an existing cohort), effect sizes were given in addition to P values.21 This served to ensure that relevant differences were not overlooked, even if they were not statistically robust in the given small sample. To calculate effect sizes, test parameters were converted into Cohen’s d (up to 0.19 no effect, 0.20–0.49 small effect, 0.50–0.79 medium effect, from 0.80 large effect); medium and large effects were interpreted.22–24 Analyses were performed with SPSS (version 25.0).

Results

(1a) Do GPs know which of their very old patients drive a car?

From 553 patients (69.5% female; mean age 90.5±2.7 years, 86–101 years) self-reports on driving activity were available: 15.9% drive a car. For 574 patients, a GP rating on driving activity was available (85.9% 'no, does not drive', 9.8% 'yes, drives', 4.4% 'don't know'). For 427 patients, both patient and GP data were available.

See Table 1 for the validity of the GP rating of driving activity.

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Table 1. Validity of the GP rating of driving activity

(1b) What is the difference between the groups of correctly recognised and overlooked drivers?

Compared with detected drivers, overlooked drivers were more likely to have a low educational status (32.7% versus 54.2%, P = 0.200; Cohen’s d = 0.43). Recognised drivers drive longer distances (73.5% versus 45.8%; P = 0.021; d = 0.56), and also drive more frequently (P = 0.001; d = 0.72) than overlooked drivers. Overlooked drivers also had higher depression scores (P = 0.010; d = 0.62). Apart from group comparisons, it is important to note that 20.8% and 29.2% of overlooked drivers had a medication or disease relevant to driving safety, respectively. For details, see supplementary Table S1.

(2a) Do GPs discuss fitness to drive with their patients?

In n = 81 cases, GPs rated patients as active drivers or patients whose driving status they did not know (the latter considered as 'fitness to drive not addressed with patient'). In n = 55 cases (67.9%) fitness to drive was not addressed with patients; in n = 26 cases (32.1%), the GP spoke with the patient about fitness to drive.

(2b) What is the difference between the groups of patients with whom the GP has spoken about fitness to drive and those with whom they have not?

Patients with whom the GP discussed fitness to drive were somewhat older (P = 0.018; d = 0.56) and had a higher educational level than those with whom fitness to drive was not discussed (23.1% versus 49.1%; P = 0.074; d = 0.53). For details, see supplementary Table S2.

Discussion

Summary

The GP rating of driving activity in very old patients is substantially consistent with the patient report,25 with moderate sensitivity and good specificity. Approximately one-third of drivers are overlooked more frequently those with low driving activity. A higher proportion of overlooked drivers have a low educational status, as do those drivers with whom the GP does not discuss fitness to drive. The majority of patients with dementia are correctly rated by their GP as not (no longer) driving. Fitness to drive is only discussed with one-third of potentially driving AgeQualiDe patients.

Strengths and limitations

The results refer to a primarily urban sample of above-average healthy and active very old patients with a high driving prevalence. Drivers are relatively seldom cognitively impaired, as has been discussed elsewhere.26 This is a highly selected sample of surviving and long-term motivated participants in a 13-year cohort study; corresponding biases cannot be excluded.27

Regarding the reported diagnostic parameters, it has to be considered that these are derived from an exploratory question within a cohort study. This is not a diagnostic accuracy study according to STARD criteria.28 Furthermore, these are the results of explorative bivariate analyses; multivariable models of independent influences of individual factors cannot be derived owing to small sample size. Multilevel analyses on the influence of GP characteristics on identifying and addressing driving are also not possible. Further research is needed here.

Comparison with existing literature

Various studies show that for patients with a low socioeconomic and especially lower educational status more time in consultations is spent for physical examination and less time for communication on health behaviour and activities of daily living.29,30 A higher socioeconomic status is accompanied by a more active communication behaviour of patients. Patients control the conversation more strongly through questions and additional information, and doctors tend to provide more detailed information in this context.29,30 In the context of addressing issues of driving safety, this may mean that less information is exchanged beyond the acute cause of treatment with patients who have a lower educational status and a more passive communication behaviour. Thus, GPs may receive less information about daily activities and mobility behaviour. In addition, overlooked drivers tend to drive less frequently and for shorter distances. It can be assumed that these are routine journeys, for example, for shopping, visits to the doctor, and regular leisure activities in the closer environment,2,3 which patients may report less often to their GP. More frequent and longer distance trips that deviate from daily routines, such as leisure activities in a wider environment or vacation, may be more likely to be a topic of conversation in the consultation.

For AgeQualiDe patients, depression levels are significantly higher among overlooked drivers, even if they are not clinically relevant. This effect can be influenced by the interaction of various factors such as sex and living situation. Older women are more often affected by depression than men,31 as are single women.32 The proportion of these two groups is higher among overlooked drivers in the sample.

The majority of patients with dementia were correctly assessed by their GP as not (no longer) driving. Cognitive as well as visual impairment, old age, and limited health can promote self-regulated driving cessation.33,34

With only one-third of all potentially driving AgeQualiDe patients, the GP addressed fitness to drive. GPs frequently perceive this topic as difficult. Even in countries where GPs are in charge of assessing medical fitness to drive, GPs are concerned that addressing driving ability can be threatening to the patient–doctor relationship, and there are uncertainties in assessment.35,36 For example, a survey of Irish GPs showed that 71% basically felt responsible for addressing driving safety.37 When assessing medical factors such as physical limitations or effects of medication, GPs felt confident, but when assessing basic driving competence there were uncertainties and a lack of assessment tools for use in general practice.35–38 Also in a study with physicians in Switzerland, Sebo found that practice assessment tools, such as a self-administered pre-consultation questionnaire, would be useful in GP practice.39 At the same time, existing information offered by driving authorities is rarely used.39

A further reason for the low level of attention paid to the topic in general practice could also be a frequently reported ethical conflict. This arises from GPs' double aspiration of maintaining the mobility of older patients and reducing risk for other road users.37,38,40,41 One of the authors' focus group studies, which explored physicians' attitudes when addressing issues of driving safety in consultation with people with dementia in general practice in Germany, revealed that GPs refuse to be involved in mandatory assessing and reporting medical fitness to drive. Nevertheless, they see their role in patient-centred care in addressing driving safety issues with patients.42 Uncertainties regarding the legal basis of the reporting process, and also regarding liability issues, are seen as further barriers to addressing fitness to drive.38,40

Implications for research and practice

According to the German Federal Statistical Office, older drivers are generally less likely to be involved in road accidents, especially compared with young drivers. Nevertheless, the risk of being the main perpetrator of accidents increases among very old drivers.43 Redelmeier et al 41 showed that the risk of accidents could be reduced if patients who are medically unfit to drive were contacted at an early stage. Against this background, early advice on driving safety risks for medical reasons is essential for maintaining mobility through the autonomous arrangement of mobility alternatives together with patients.

A standardised question on driving, which is integrated into the geriatric assessment, could increase GPs' knowledge about car driving of older patients and, above all, provide the impetus for a further discussion. Owing to the possible negative consequences and individual risks of driving cessation, which are associated with risks for social participation in general,41,44,45 addressing driving issues in general practice should be embedded in a trustful patient—doctor relationship and in an appropriate communicative strategy. Further research is needed to develop assessment tools for general practice settings that also consider national programmes on supporting driving safety, traffic, and licensing regulation, as well as responsibilities in assessing medical fitness to drive.

Driving is an important prerequisite for social participation, especially for older people in rural and suburban areas.3 To reduce the individual risks of driving cessation, a deeper understanding of not only utilitarian mobility needs, but also affective and aesthetic mobility needs of older people is needed.3 Addressing mobility behaviour in general practice at an early stage thus provides access to address patient-centred mobility alternatives to secure autonomy and enable social participation.

Notes

Funding

This study was conducted within the framework of the Dementia Competence Network (KND), the Degenerative Dementia Competence Network (KNDD) (German Study on Ageing, Cognition and Dementia in Primary Care Patients; AgeCoDe) and the BMBF initiative Health Services Research (Study on Needs, health service use, costs and health-related quality of life in a large sample of oldest-old primary care patients [85+; AgeQualiDe]) and was funded by the Federal Ministry of Education and Research (BMBF) with grants: 01GI0102, 01GI0420, 01GI0422, 01GI0423, 01GI0429, 01GI0431, 01GI0433, 01GI0434, 01GI0710, 01GI0711, 01GI0712, 01GI0713, 01GI0714, 01GI0715, 01GI0716, 01GY1322A, 01GY1322B, 01GY1322C, 01GY1322D, 01GY1322E, 01GY1322F, 01GY1322G.

Ethical approval

Ethical approval was obtained from each study centre: Ethics Commission of the Hamburg Medical Association (OB / 08 / 02, 2817/2007, MC-390/13), Ethics Commission of the Rheinische Friedrich-Wilhelms-University (050/02 and 174/02 for E 3.2, 258/07, 369/13), Medical Ethics Commission II of the Faculty of Clinical Medicine Mannheim of the Karl-Ruprechts-University Heidelberg (0226. 4 /2002, 2007-253E-MA, 2013-662N-MA), Ethics Commission at the Medical Faculty of the University of Leipzig (143/2002, 309/2007, 309/2007;AZ: 333-13-18112013), Ethics Commission of the Medical Faculty of the Heinrich Heine University Düsseldorf (2079/2002, 2999/2008, 2999), Ethics Commission of the Faculty of Medicine of the Technical University Munich (713/02, 713/02 E, 713/02 E). All participants were informed about the study prior to their participation and gave written informed consent before participation.

Provenance

Freely submitted; externally peer reviewed.

Acknowledgements

The authors would like to thank all the patients and their GPs participating in the study for their cooperation. They would also like to thank the German Federal Highway Research Institute (BaSt) for information on the DRUID project.

Contributors

Wolfgang Maier, Martin Scherer, Steffi G. Riedel-Heller, Heinz-Harald Abholz, Christian Brettschneider, Cadja Bachmann, Horst Bickel, Wolfgang Blank, Hendrik van den Bussche, Sandra Eifflaender-Gorfer, Marion Eisele, Annette Ernst, Angela Fuchs, André Hajek, Kathrin Heser, Frank Jessen, Hanna Kaduszkiewicz, Teresa Kaufeler, Mirjam Köhler, Hans-Helmut König, Alexander Koppara, Diana Lubisch, Tobias Luck, Dagmar Lühmann, Melanie Luppa, Tina Mallon, Manfred Mayer, Edelgard Mösch, Michael Pentzek, Jana Prokein, Alfredo Ramirez, Susanne Röhr, Anna Schumacher, Janine Stein, Susanne Steinmann, Franziska Tebarth, Carolin van der Leeden, Michael Wagner, Klaus Weckbecker, Dagmar Weeg, Jochen Werle, Siegfried Weyerer, Birgitt Wiese, Steffen Wolfsgruber, Thomas Zimmermann, Hendrik van den Bussche.

Competing interests

The authors declare that no competing interests exist.

  • Received August 27, 2020.
  • Accepted September 30, 2020.
  • Copyright © 2021, The Authors

This article is Open Access: CC BY license (https://creativecommons.org/licenses/by/4.0/)

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GPs’ awareness of car driving among oldest patients: exploratory results from a primary care cohort
Verena Leve, Michael Pentzek, Angela Fuchs, Horst Bickel, Dagmar Weeg, Siegfried Weyerer, Jochen Werle, Hans-Helmut König, André Hajek, Dagmar Lühmann, Hendrik van den Bussche, Birgitt Wiese, Anke Oey, Kathrin Heser, Michael Wagner, Melanie Luppa, Susanne Röhr, Wolfgang Maier, Martin Scherer, Hanna Kaduszkiewicz, Steffi G Riedel-Heller, for the AgeCoDe/AgeQualiDe Study Group
BJGP Open 2021; 5 (2): BJGPO.2020.0145. DOI: 10.3399/BJGPO.2020.0145

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GPs’ awareness of car driving among oldest patients: exploratory results from a primary care cohort
Verena Leve, Michael Pentzek, Angela Fuchs, Horst Bickel, Dagmar Weeg, Siegfried Weyerer, Jochen Werle, Hans-Helmut König, André Hajek, Dagmar Lühmann, Hendrik van den Bussche, Birgitt Wiese, Anke Oey, Kathrin Heser, Michael Wagner, Melanie Luppa, Susanne Röhr, Wolfgang Maier, Martin Scherer, Hanna Kaduszkiewicz, Steffi G Riedel-Heller, for the AgeCoDe/AgeQualiDe Study Group
BJGP Open 2021; 5 (2): BJGPO.2020.0145. DOI: 10.3399/BJGPO.2020.0145
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Keywords

  • general practice
  • automobile driving
  • aged, 80 and over
  • physician—patient relations
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