Peripheral fat distribution versus waist circumference in metabolic syndrome for predicting mortality.

Objective To elucidate whether the PF-combined definition of metabolic syndrome (MetS) would show a better predictive ability for cause-specific mortality than the common MetS. Methods The data were derived from the National Health and Nutrition Examination Survey from 1999 through 2002. We investigated three types of MetS including WCMetS, PFMetS, and PF-combined definition MetS. The main outcome was to evaluate the predictive ability of the newly defined MetS for time to cause-specific mortality. The secondary outcomes were the relationships between the PF percentage and C-reactive protein (CRP) and homeostasis model assessment of insulin resistance (HOMA-IR) to clarify the gender discrepancy. Results For cardiovascular mortality, the adjusted hazard ratios for WCMetS, PFMetS, and PF-combined definition MetS were 1.867, 1.742, and 2.117, respectively (all P < 0.001). A positive association between PF percentage and CRP in men, and a negative correlation between PF percentage and HOMA-IR in women after adjustment for all variates were found. Conclusions The PF-combined definition of MetS had a stronger predictive ability for all-cause and cardiovascular mortality than general MetS. Notably, the PF might have differential gender-specific health effects on cardiovascular events.