Birth weight discordancy in male-first and female-first pairs of unlike-sexed twins

Isaac Blickstein, Ariel Weissman

Research output: Contribution to journalArticlepeer-review

Abstract

We studied 153 consecutive twin pairs of unlike sex. Comparison of 71 male-female pairs with 82 female-male pairs showed similar mean twin birth weight and rate of discordance. However, males were significantly heavier (p < 0.04) compared with females in the male-first but not in the female-first combination. The rate of female discordance was significantly higher compared with male discordance in both fetal sex combinations. It is concluded that females of unlike-sexed pairs are at greater risk to be growth discordant. Fetal sex, therefore, should be included as one of several factors that produce divergent twin growth.

Original languageEnglish
Pages (from-to)661-663
Number of pages3
JournalAmerican Journal of Obstetrics and Gynecology
Volume162
Issue number3
DOIs
StatePublished - Mar 1990
Externally publishedYes

Keywords

  • Twins
  • birth weight
  • discordancy
  • sex

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