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早产儿在我国的发生率为 5 .0 %～ 6 .4 % [1 ] 。随着医学科学技术发展和医疗条件的改善 ,早产儿的存活率有明显提高 ,有报道 ,早产儿存活者中的 10 .0 %～ 2 0 .0 %仍有不同程度的伤残 [2 ]。出生体重小于 15 0 0 g的早产儿中有 5 .0 %～ 15 .0 %长大后遗留有严重的神经系统?
The incidence of premature children in our country is 5.0% ~ 6.4% [1]. With the development of medical science and technology and the improvement of medical conditions, the survival rate of premature infants has been significantly improved. It is reported that 10.0% ~ 20.0% of the survivors of premature infants still have some degree of disability [2] . Preterm infants born weighing less than 150 g have 5 .0% ~ 15. 0% of them left with severe nervous system?