ADIPOQ and type 2 diabetes mellitus: Possible explanations for the absence of an association with T2DM are: (a) the SNP+276 polymorphism in the adiponectin gene is not a candidate SNP for T2DM in the Chinese Han population; (b) the effect of SNP+276 might be masked by the summed effects of other unidentified genetic factors; (c) only 11 studies were included in our meta-analysis.