APOB and coronary artery disorder: In the present study, the associations between the lipoprotein ratios and the severity of CHD were further investigated and the results showed that the ratio of apoB100/apoAI, but not the HDL-C related ratios (i.e. TG/HDL-C, TC/HDL-C and LDL-C/HDL-C), was significantly and independently associated with the severity of CHD.