Methods: A total of 1743 UCB units were measured for the biological features, including white blood cell count, red blood cell, Hb, CD34(superscript +) and volume of cord blood.

• 我们分析从2001到2006年中，收集1743个脐带血单位，记录白血球数、红血球数、血色素、CD34(上标+)和脐带血体积。