Data on the health status of migrants are still scarce. One of the reasons for this is that migration status has not been well recorded in official statistics and epidemiological studies. In order to obtain an adequate and standardised operationalisation of migrant status, we first need an exact definition of the terms "migrant" and "migration background". We discuss approaches to the definition of terms and the surveying of ethnic minorities and migrants, and then develop a basic set of migration status indicators for use in epidemiological research. This set of indicators includes country of birth of the father and mother, year of immigration, mother tongue, German language skills and status of residence. The key indicator for the identification of migrants is the country of birth of the parents and not the nationality as was previously often the case. Thus, the classification based on the judicial category of nationality is replaced by a classification based on the biographical event "migration". Migration brings with it specific life conditions and challenges that can impact health across several generations. An instrument for surveying migrant status must be further developed both to reflect the special conditions of the life situation resulting from the migration experience and to take as full account as possible of all aspects of a migrant's history.
Despite the many potential sources of stress and strain that accompany a migration situation, there are very few data in official statistics with regard to the health and social situation of migrants in Germany. The fact that this information is not available for public health reporting could lead to problems of improper, lacking or excessive health care. A working group within the Arbeitskreis Migration und Offentliche Gesundheit has been addressing this problem since 2003. In this article, a systematic overview of the most important data sources for public health reporting and of the indicators for migration background and social status that each one contains will be given. After that we will present examples of good practice in migration-sensitive data collection at the local and national level. Finally suggestions for improving the data situation with regard to the health of migrants based on the recommendation for recording the migration status in epidemiological studies will be made.
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