[Preventive home visits to the elderly: systematic review of available evidence]

The aim of preventive home visits to elderly persons is to reduce mortality, to avoid admissions to nursing homes and hospitals and to improve the functional status and general wellbeing of the elderly. Preventive home visits are rarely a standard service in national health care systems. For over 20 years, controlled randomized studies have been carried out to test their effectiveness. This systematic review evaluates the evidence available on preventive home visits for elderly persons in the context of considerations relating to the incorporation of such a service into the German health care system. Three current systematic reviews (two of them meta-analyses) were identified in a systematic literature survey. They consider a total of 26 studies, most of them RCTs. A further three original controlled studies were identified and evaluated. The original studies were very heterogeneous with respect to goals, target groups, intensity and duration of the home visit programme and with respect to the individuals performing the study (number, profession, qualifications and cooperation). This makes it more difficult to perform a pooled overall evaluation. It was possible to consider mortality, admissions to nursing homes, functional status and psychosocial status as relevant target parameters. The systematic reviews arrive at different assessments of effectiveness. A quantitative, across-studies evaluation demonstrated that preventive home visits to elderly persons were effective both in studies with selected and with unselected inclusion of participants. The second meta-analysis did not confirm this result. Effectiveness here was only demonstrated using stratified analyses which investigated a large number of home visits, the performance of a multidimensional assessment with follow-up visits and the average age and morbidity of participants as relevant influencing factors. However no factor exerted an influence over more than one of the investigated target parameters. The findings thus constitute very unspecific evidence of effectiveness with largely unclear determinants of success. Preventive home visit programmes have been tested in various health systems. Results from controlled (randomised) German studies have not been published to date. The results of studies from other countries have only limited applicability to the conditions in the German health care system because the opportunities for, and extent of, economical and effective improvement in the preventive care of the elderly depend on the standard of care existing in the individual country. The additional value of screening depends on the empirical level of care and not on a given standard. At present the introduction of home visits in Germany cannot be recommended beyond studies. However there appear to be sufficient reasons for controlled studies in Germany which should be carried out in a coordinated way with mutual agreement on concepts.