title: Twin weight discordance and maternal weight gain in twin pregnancies.
abstract: OBJECTIVE
  To evaluate the association between twin weight discordance and maternal weight change during the gestational period.
  
  
  METHODS
  One hundred forty-seven twin pregnancies (Group A: <25%, Group B: > or =25% birth weight discordance) were analyzed using Student's t-test, chi(2)-test, and two-way ANOVA at three gestational intervals: before 18 weeks, 18 to 28 weeks, and 28 weeks to birth.
  
  
  RESULTS
  There was no statistically significant difference between the two groups involving maternal age, parity, duration of pregnancy, height, pregravid weight, and conception method. Group A showed a pattern of constantly increasing maternal weight without a significant change in the twin weight discordance throughout gestation. However, Group B showed a fluctuation in maternal BMI with remarkably elevated twin weight discordance at 28 weeks to birth.
  
  
  CONCLUSIONS
  The results suggest that in twin pregnancies constant maternal weight gain throughout gestation is important for maintaining a twin weight discordance of less than 25%.
authors.affiliation: Department of Obstetrics and Gynecology, Pochon CHA University College of Medicine, Seoul, Korea. drlkj52551@hanmail.net
authors.forename: K J
authors.initials: KJ
authors.lastname: Lee
authors.forename: J
authors.initials: J
authors.lastname: Hur
authors.forename: J
authors.initials: J
authors.lastname: Yoo
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001724:Birth Weight; D015992:Body Mass Index; D001835:Body Weight; D005260:Female; D020567:Fetal Weight; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D011272:Pregnancy, Multiple / Q000502:physiology*; D014427:Twins; D016216:Ultrasonography, Prenatal; D015430:Weight Gain