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 language | English |
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Pages (from-to) | 661-663 |
Number of pages | 3 |
Journal | American Journal of Obstetrics and Gynecology |
Volume | 162 |
Issue number | 3 |
DOIs | |
State | Published - Mar 1990 |
Externally published | Yes |
Keywords
- Twins
- birth weight
- discordancy
- sex