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F. Mac, L. Knudsen (1989)
[Abnormalities among newborn children born to immigrants in Denmark in the period 1983-1987].Ugeskrift for laeger, 151 18
N. Başaran, H. Hassa, A. Basaran, S. Artan, J. Stevenson, B. Şayli (1989)
The effect of consanguinity on the reproductive wastage in the Turkish populationClinical Genetics, 36
(1989)
Misdannelser blandt nyfodte indvandrerborn i Danmark 1983-1987
Received I January, acceptedjor publication 20 January 1990 In an epidemiologic investigation of the effect of consanguinity on reproductive wastage (Basaran et al. 1989), the authors initially recognized the difficulty in distinguishing the influence of genetic and environmental factors on reproductive wastage. Neither in the analysis, nor even in the discussion, however, did they attempt to take environmental factors into consideration. The results taken at face value indicate a strong effect of consanguinity on the risk of fetal and infant death. We have no access to data on the association between socioeconomic factors and consanguinity in Turkey, and the authors do not mention such data. Consanguinity in Turkey might be a traditional phenomenon, and especially in the cities most prevalent among the less affluent part of the population. We would in fact be surprised if it were not the case. Why do the authors not address this central issue? Virtually hundreds of studies from all over the world have invariably shown a strong association between socioeconomic conditions and the risk of fetal and infant death. The figures in the paper probably to a large extent (or entirely) reflect this association rather than the effect of consanguinity. The impressive magnitude of the investigation in no way compensates for this obvious source of confounding; it should have been taken into consideration during the analysis, or at least in the discussion of the results. The investigation does not improve insight into the effects of consanguinity. Biased results may harm not only the development of scientific knowledge, but also the public perception. In Denmark, persons hostile to immigrants have spread the idea that Turkish immigrants - because of consanguinity - gave birth to a high proportion of malformed children. A carefully conducted and analyzed study (Mac 8c Knudsen 1989) did not support the postulate. E. Z. Jeppesen S. Juul
Clinical Genetics – Wiley
Published: May 1, 1990
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