Varma T R
Br J Obstet Gynaecol. 1979 Apr;86(4):290-2. doi: 10.1111/j.1471-0528.1979.tb11258.x.
I report a review of 1500 pregnant patients: 30 of them (or 1 in 50) were thought to have multiple pregnancies when examined by ultrasound in the first trimester. Only 14 of the 30 patients (46.7 per cent) produced live infants: 13 twins and one set of triplets. Twelve (40 per cent) had bleeding in early pregnancy and 11 of these had a spontaneous abortion. Five of seven patients found to have a normal pregnancy and a coexistent blighted ovum, ultimately delivered a single live infant.
我报告了对1500名孕妇的回顾性研究：其中30名（即50分之一）在孕早期接受超声检查时被认为怀有多胎妊娠。这30名患者中只有14名（46.7%）产下活婴：13对双胞胎和1组三胞胎。12名（40%）在孕早期有出血情况，其中11名发生自然流产。7名被发现怀有正常妊娠并伴有枯萎卵的患者中，有5名最终产下一名活婴。
