Figure 1
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1471-2431-11-115/MediaObjects/12887_2010_Article_532_Fig1_HTML.jpg)
Selection of analysis dataset. Analysis set limited to live births without congenital abnormalities born to HIV-negative women; outliers removed as discussed in methods.
* Oken E, Kleinman KP, Rich-Edwards J, Gillman MW. A nearly continuous measure of birth weight for gestational age using a United States national reference. BMC Pediatrics 2003;3:10.