Fig 2. Effect of increase in the number of “effective” risk alleles on the risk of Kidney stone disease in combined samples.

OR are plotted on the y-axis for the corresponding number of “effective” risk alleles on the x-axis. Numbers in parentheses on x-axis indicate sample size in each category. <2 group considers as reference group. <2: Individuals having 2 or less “effective” risk alleles. 2- -3: Individuals having 2–3 “effective” risk alleles. 3- -4: Individuals having 3–4 “effective” risk alleles. >4: Individuals having 4 or more “effective” risk alleles.