1. Association between birth weight and first-trimester free β–human chorionic gonadotropin and pregnancy-associated plasma protein A 
Silvana Canini, B.Sc., Federico Prefumo, M.D., Ph.D., Daniela Pastorino, M.D., Lucia Crocetti, M.D., Calogero Gallo Afflitto, B.Sc., Pier Luigi Venturini, M.D., Pierangela De Biasio, M.D. 
Fertility and Sterility 
Volume 89, Issue 1, Pages (January 2008)
DOI: /j.fertnstert
Copyright © 2008 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
Customized birth weight percentiles according to first-trimester maternal serum PAPP-A deciles. Data are shown as median and interquartile range. There is a significant increase in birth weight with increasing PAPP-A deciles (P<.001).
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2008 American Society for Reproductive Medicine Terms and Conditions

3. Figure 2
Customized birth weight percentiles according to first-trimester maternal serum free β-hCG deciles. Data are shown as median and interquartile range. There is no significant correlation between birth weight and free β-hCG deciles (P=.27).
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2008 American Society for Reproductive Medicine Terms and Conditions