Revisiting the 'Low BirthWeight paradox' using a model-based definition.

Authors :: Juárez S
Ploubidis GB
Clarke L
Source :: Gaceta sanitaria [Gac Sanit] 2014 Mar-Apr; Vol. 28 (2), pp. 160-2. Date of Electronic Publication: 2013 Dec 21.
Publication Year :: 2014
Abstract: Introduction: Immigrant mothers in Spain have a lower risk of delivering Low BirthWeight (LBW) babies in comparison to Spaniards (LBW paradox). This study aimed at revisiting this finding by applying a model-based threshold as an alternative to the conventional definition of LBW.<br />Methods: Vital information data from Madrid was used (2005-2006). LBW was defined in two ways (less than 2500g and Wilcox's proposal). Logistic and linear regression models were run.<br />Results: According to common definition of LBW (less than 2500g) there is evidence to support the LBW paradox in Spain. Nevertheless, when an alternative model-based definition of LBW is used, the paradox is only clearly present in mothers from the rest of Southern America, suggesting a possible methodological bias effect.<br />Conclusion: In the future, any examination of the existence of the LBW paradox should incorporate model-based definitions of LBW in order to avoid methodological bias.<br /> (Copyright © 2013 SESPAS. Published by Elsevier Espana. All rights reserved.)