Ultrasound dating subject to biasBMJ 1994; 308 doi: https://doi.org/10.1136/bmj.308.6922.201a (Published 15 January 1994) Cite this as: BMJ 1994;308:201
- T B Henriksen,
- A Wilcox
- Perinatal Epidemiological Research Unit, Department of Obstetrics and Gynaecology, Aarhus University Hospital, DK-8000 Aarhus C, Denmark
- Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA.
EDITOR, - Mark Wilcox and colleagues used ultrasonography to determine fetal age and reported a stronger correlation between birth weight and gestational age at term than has been observed previously.1 We believe that their approach is subject to bias.