“…In particular, the proximity within which area-level socioeconomic disadvantage might influence birth outcomes is unknown. Furthermore, delineation of meaningful geographic exposures may vary between SGA and LGA because they may involve different causal pathways (Coulton, et al, 2012; Diez Roux, 2007; Spielman and Yoo, 2009; Daniel, et al, 2008; Soobader, et al, 2006; Flowerdew, et al, 2008; Krieger, et al, 2003) . That is, we theorize effects on LGA to operate through neighborhood environments that promote obesity-related behaviors (Diez Roux and Mair, 2010; Schempf, et al, 2009; Daniel, et al, 2008; Culhane and Elo, 2005; Vinikoor-Imler, et al, 2011; Elo, et al, 2009; Metcalfe, et al, 2011).…”