Heritability estimates for blood glucose, insulin resistance index and prediabetes*.

*FPG, fasting plasma glucose; 2hPG, 2h post-load plasma glucose; HOMA-IR, the homeostatic model assessment for insulin resistance; IFG, impaired fasting glucose; IGT, impaired glucose tolerance; MZ, monozygotic; DZ, dizygotic; a2, additive effects of genes on multiple loci; c2, environmental effects shared by twins in the same family; e2, environmental effects unique to the individual.*FPG：空腹血浆葡萄糖（fasting plasma glucose）；2hPG：糖负荷后2小时血浆葡萄糖（2h post-load plasma glucose）；HOMA-IR：胰岛素抵抗稳态模型评估指数（homeostatic model assessment for insulin resistance）；IFG：空腹血糖受损（impaired fasting glucose）；IGT：糖耐量减低（impaired glucose tolerance）；MZ：同卵双生（monozygotic）；DZ：异卵双生（dizygotic）；a²：多基因位点的加性遗传效应（additive effects of genes on multiple loci）；c²：同一家族双生子共享的环境效应（environmental effects shared by twins in the same family）；e²：个体独有的环境效应（environmental effects unique to the individual）