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American Journal of Epidemiology Vol. 152, No. 12 : 1120
Copyright © 2000 by The Johns Hopkins University School of Hygiene and Public Health

ORIGINAL CONTRIBUTIONS

Cheung et al. Respond to "Are Appearances Deceiving?"

Yin Bun Cheung1,2, Paul Yip1,3 and Johan Karlberg1,2

1 Clinical Trials Centre, Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China.
2 Department of Paediatrics, University of Hong Kong, Pokfulam, Hong Kong, China.
3 Department of Statistics and Actuarial Sciences, University of Hong Kong, Pokfulam, Hong Kong, China.


   INTRODUCTION
 
Professor Lie commented that it would be hasty to conclude from the present evidence that twin fetuses are healthier than singleton fetuses early in pregnancy (1Go). He highlighted the problems in residual confounding and cross-sectional data. Indeed, in our paper we also pointed out the . . . [Full Text of this Article]


   NOTES
 

   REFERENCES
 

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Related articles in Am. J. Epidemiol.:

Mortality of Twins and Singletons by Gestational Age: A Varying-Coefficient Approach
Yin Bun Cheung, Paul Yip, and Johan Karlberg
Am. J. Epidemiol. 2000 152: 1107-1116. [Abstract] [FREE Full Text]