Background: Health of migrants is known to be above-average in the beginning of the migration trajectory. At the same time reports from non-government organisations (NGOs) suggest that undocumented migrants in Germany tend to present late and in poor health at healthcare facilities. In this paper, we explore the health status of undocumented migrants with a mixed method approach including complementary qualitative and quantitative datasets. Methods: Undocumented migrants attending a NGO based in Hamburg, Germany, were asked to fill in the SF-12v2, a standardized questionnaire measuring health-related quality of life (HRQOL). The SF-12v2 was analyzed in comparison to the U.S. American norm sample and a representative German sample. Differences in mean scores for HRQOL were evaluated with a t-test and with a generalized linear model analyzing the impact of living without legal status on HRQOL. The quantitative research was complemented by a qualitative ethnographic study on undocumented migration and health in Berlin, Germany. The study included semi-structured interviews, informal conversations and participant observation with Latin American migrants over the course of three years. The study focused on subjective experiences of illness and health and the impact of illegality on migrants' health and access to health care. Results: HRQOL was significantly worse in the sample of undocumented migrants (n∈=∈96) as compared to the U.S. American sample (p∈<∈0.005). Living without legal status displayed a significant negative effect on subjective mental and physical health (p∈≤0.003) in the generalized linear model when adjusted for age and gender compared to the representative German population sample. The ethnographic study, which included 35 migrants, identified socio-economic conditions, the subjective experiences of criminalization, and late presentation at healthcare-facilities as the three main factors impacting on health from migrant perspective. Discussion: The present research suggests a high morbidity and mortality in this comparatively young population. The ethnographic research confirms negative impacts on health of social determinants in general and stressassociated with living without legal status in particular, both are further aggravated by exclusion from health care services. In addition to the provision of health care it appears to be important to structurally tackle the underlying social conditions which affect undocumented migrants' health. Conclusions: Living without legal status has a negative impact on health and well-being. Limited access to care may further exacerbate physical and mental illness. Possibilities to claim basic rights and protection as well as access to care without legal status appear to be important measures to improve health and well-being. ©2015 Kuehne et al.

Health-related quality of life Migration immigrants social determinants of health illegal migrants Health status Germany Undocumented migrants Subjective health Access to care

cultural anthropology Germany human epidemiology Self Report middle aged statistics and numerical data social determinants of health health status qualitative research quality of life Humans male female Socioeconomic Factors socioeconomics legislation and jurisprudence adult migration Transients and Migrants Anthropology, Cultural Health Services Accessibility health care delivery