Twin methodology is not always easily understood

BMJ 1996; 313 doi: https://doi.org/10.1136/bmj.313.7055.491a (Published 24 August 1996) Cite this as: BMJ 1996;313:491
  1. Kirsten Ohm Kyvik, Assistant lecturer
  1. Danish Twin Register, Odense Universitet, DK-5000 Odense C, Denmark

    EDITOR,—Nick P Thompson and colleagues' report of their twin study looking at the effects of genetics versus the environment in inflammatory bowel disease would have benefited from being reviewed by someone doing research into twins and being revised according to his or her suggestions.1 The authors obviously cannot do anything about the bias due to ascertainment, since no population based British twin registry exists. They discuss this appropriately. Other mistakes in the …

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