Objective To study the significance of changes of serum hydrogen sulfide and 25-(OH)D_3 in obese children with different glucose tolerance.Methods According to the oral glucose tolerance test(OGTT),204 obese children were divided into impaired fasting glycaemia(IFG)group,impaired glucose tolerance(IGT)group,IFG combined with IGT group and diabetes mellitus(DM)group from Jan 2013 to Jan 2016.Totally 46 obese children with normal OGTT were as obese group.The levels of serum H_2S and 25-(OH)D_3 were tested by ...