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¡¡¡¡ABSTRACT
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¡¡¡¡Objevtive:  To  study  the  physical  growth  characteristics  and  the variation  trend  of  the  weight  difference  of  birthweight  discordant  twins (BDT)  by  extracting  and  analyzing  data  of  twins  of  Child  Health  Care system of Children's hospital of Chongqing Medical University.
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¡¡¡¡Methods: R 3.5.3 was used to clean up the database and complete the fitted  curve  of  physical  growth  index.  SPSS  19.0  software  was  used  for statistical analysis.
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¡¡¡¡Results: A total of 916 pairs of twins were extract from Child Health Care  System,  including  141  pairs  of  BDT,  accounting  for  15.4%.  The degree  of  birthweight  difference  in  BDT  concentrates  on  range  of 20%~30%, and the degree of birthweight difference in premature BDT was higher than that of full-term BDT (t=3.820, p<0.001). The weight, height, head  circumference  and  BMI  of  lighter  BDT  were  lower  than  those  of birthweight accordant twins, heavier BDT and WHO average level, and the growth trend of each group was different. The weight difference at the last follow-up was smaller than that at birth. At the last follow-up, the physical deviation of BDT was dominated by short stature and low body weight, and a  small  number  of  twins  also have  emaciation  on the  basis  of  low  body weight and short stature.
¡¡¡¡
¡¡¡¡Conclusion:  the  morbidity  of  BDT  in  this  study  is  similar  to  that reported  abroad.  Proportion  of  low  or  very  low  birthweight  is  higher  in group of lighter BDT, and their catch-up growth and physical growth level is worse than other twins and the average level of WHO. In most cases, the weight  difference  of  BDT  decreased  with  age  than  at  birth.  The  genetic background  and  the  growth  environment  after  birth  of  a  twin  pair  are similar. The difference of intrauterine growth environment and the adverse perinatal  factors  of  twins  may  have  a  long-lasting  influence  on  the long-term growth and development of twins. We should monitor the growth status  of  BDT  and  intervene  in  time  if  necessary.  The  data  of  the department  of  child  health  care,  obstetrics  and  neonatology  should  be further enhanced to facilitate the combination of perinatal high-risk factors in  the  monitoring  process  of  child  health  care  and  provide  targeted guidance according to the perinatal situation.
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¡¡¡¡Key words:   twins, birthweight discordance, physical growth¡£
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