That is, no correlation was found between the markers of high status and Olmec-style objects, and although larger numbers of Olmec-style objects were found in rich graves, they constituted a smaller percentage of the grave goods there.
The passage states that no relationship was discovered between indicators of wealth and the presence of Olmec-style artifacts.  While more of these artifacts were found in wealthy graves, they represented a smaller proportion of the overall contents of those graves.