P2‐303: DEMOGRAPHIC VARIATIONS IN MID‐LIFE COGNITIVE FUNCTION: THE CARDIA STUDY. (1st July 2014) - Levine, Deborah A.; Yaffe, Kristine; Launer, Lenore; Reis, Jared; Sidney, Steve; Bradley, Virginia Wadley; Whitmer, Rachel A.; Coker, Laura H.; Zhu, Na; Jacobs, David