Characteristics of individual studies for association between ApoB-100 gene polymorphisms and risks of gall stones (GS).

athe mean age of case and controls;bthe gender was shown as the percentage of the males;cHB and PB referred to hospital-based controls and population-based controls, respectively;d11,12,22 represented X−X−, X−X+, X+X+ for XbaI polymorphism, GG, AG, AA for EcoRI polymorphism, II, ID, DD for insertion/deletion polymorphism, respectively;ep for Hardy–Weinberg equilibrium test in controls;“Na” means not available.