GDF15 and gout: In the intercritical gout group, GDF-15 was moderately and negatively correlated with eGFR (r = −0.53, p < 0.01), weakly and negatively correlated with albumin (r = −0.37, p < 0.05), and weakly and positively correlated with HDL cholesterol (r = 0.40, p < 0.05).