Gene-gender interactions for SLC2A9 rs11722228 and ABCG2 rs2231142. The P-values were calculated by using natural log transformed uric acid concentrations as dependent variable. The Y axis represented mean of uric acid concentrations. The X axis represented different gender groups. Multivariate adjusted model was used to analyze the (A) interaction for SLC2A9 rs11722228 and gender in determining uric acid concentration, (B) interaction for ABCG2 rs2231142and gender in determining uric acid concentration.