ALB and nephrolithiasis: Compared to the first quartile, the fourth quartile of RDW (OR = 1.44 [1.21–1.72], Ptrend < 0.001) and RAR (OR = 1.62 [1.35–1.95], Ptrend < 0.001) were positively associated with the prevalence of kidney stones, whereas albumin (OR = 0.75 [0.63–0.89], Ptrend < 0.001) was negatively associated with the prevalence of kidney stones after multivariable adjustment.