Blickstein I, Zalel Y, Weissman A
Department of Obstetrics and Gynecology, Kaplan Hospital, Rehovot, Israel.
J Reprod Med. 1995 Jun;40(6):443-6.
To test the hypothesis that increased twin birth weight is expected with increased parity, we conducted a retrospective, cross-sectional evaluation of 430 twins, focusing on birth weight and growth discordance parameters in five parity groups (para 1-4 and > or = 5). The mean birth weight of twin A, B and both twins was significantly lower in primiparous patients as compared to para 2-4 but not as compared to para > or = 5 patients. The frequency of twins weighing < 1,500 g was similar in all groups, but a significantly higher frequency of twins weighing 1,500-2,500 g and lower frequency at > 2,500-g twins were found in the para 1 group as compared to the groups with higher parities. Presentation combinations were not different in the five parity groups, nor were the frequencies of growth discordance categories. However, discordants among pairs, with each infant weighing < 2,500 g, occurred almost twice as often in para > or = 5 as compared to the other parity groups. Our data indicate that primiparae seem to have significantly smaller twins as compared to multiparae. This trend was independent of the presentation combinations and growth discordance pattern and seems to result from a higher frequency of twins weighing 1,500-2,500 g in primiparae.
为了验证随着产次增加双胞胎出生体重也会增加这一假设，我们对430对双胞胎进行了一项回顾性横断面评估，重点关注五个产次组（初产妇、经产妇2 - 4次及≥5次）的出生体重和生长不一致参数。与经产妇2 - 4次组相比，初产妇组中双胞胎A、B及两者的平均出生体重显著更低，但与经产妇≥5次组相比则无显著差异。所有组中体重<1500 g的双胞胎频率相似，但与产次较高的组相比，初产妇组中体重在1500 - 2500 g的双胞胎频率显著更高，而体重>2500 g的双胞胎频率更低。五个产次组的胎位组合无差异，生长不一致类别的频率也无差异。然而，与其他产次组相比，在经产妇≥5次组中，每对双胞胎中每个婴儿体重<2500 g的不一致情况出现频率几乎是其他组的两倍。我们的数据表明，与经产妇相比，初产妇的双胞胎似乎明显更小。这一趋势与胎位组合和生长不一致模式无关，似乎是由于初产妇中体重在1500 - 2500 g的双胞胎频率更高所致。
