The Frequency of Twinning in Poor Chinese in the Maternity Hospital, Singapore

Millis, Jean

doi:10.1111/j.1469-1809.1958.tb01459.x

Cited by 13 publications

(12 citation statements)

References 10 publications

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“…This is not supported by the social class findings, however, and it seems equally likely that there may be a genetic predisposition to twinning in taller and heavier women. There are marked differences in dizygotic twinning rates throughout the world and it is interesting to note that a very high incidence is found in Nigeria (Nylander, 1970) where the women are very tall, while there is a low incidence among the Japanese (Morton, 1955) and the Singapore Chinese (Millis, 1959) who are small. Further studies to determine the relationship between maternal social class, height, weight and weight gain and zygosity will be of interest because of the fairly constant rate of monozygous twins compared to the variable dizygosity rate.…”

Section: Discussionmentioning

confidence: 99%

“…It is difficult, in the light of these increased risks to mother and fetus, to regard twin pregnancy as anything other than pathological, but it has been suggested from a review (Hytten & Leitch, 1971a) of the incidence of twinning throughout the world, that, although there are marked ethnic differences, there is perhaps a tendency for the twinning rate to be less in poorly nourished communities. The poor Chinese in Singapore, for example, showed a low incidence of dizygous twinning (Millis, 1959). This is also true in sheep, as a well-nourished ewe will produce two or three lambs, whereas one which is underfed produces only one lamb.…”

Section: Introductionmentioning

confidence: 99%

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Maternal characteristics of women having twin pregnancies

Campbell

MacGillivray

1974

J. Biosoc. Sci.

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A comparison was made between 1308 mothers delivered of twins in Aberdeen between 1950 and 1969 and mothers of singleton infants. There was a greater number of tall women amongst mothers of twins. This was more marked in primigravidae than in multiparae. The rate of twinning was less in thin women than in those who were obese or of normal build. The social class of the husband did not appear to influence the incidence of twins. The rate of weight gain in twin pregnancies, even in early pregnancy, was high compared with the rate in singleton pregnancies. The more frequent occurrence of twinning in heavier, taller women, suggests that nutrition might be responsible but this is not borne out by the findings about social class.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Maternal characteristics of women having twin pregnancies

Campbell

MacGillivray

1974

J. Biosoc. Sci.

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“…This table also illustrates how the monozygotic twinning rate can be used as an internal check, since it is always about 3; per thousand in series known on other grounds to be accurate. Millis (1959) has recently reported the twinning rates among Chinese delivered at the Maternity Hospital, Singapore. Her figures are almost the same as Komai & Fukuoka's hospital rates, and it seems likely that they are inflated for the same reason.…”

Section: Hospital Records Pre-warmentioning

confidence: 99%

The twinning rate in Europe and Africa

Bulmer

1959

Annals of Human Genetics

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Summary Data are presented on the twinning rate among Europeans and Negroes. The monozygotic twinning rate is constant; there is, however, considerable variation in the dizygotic rate. The dizygotic rate is higher among Negroes than Europeans. There are also variations within these groups. In particular there seems to be a centre of low twinning rate in south‐west Europe. I should like to thank the following who have gone to great trouble in sending me data: E. A. Barker, Nqutu, Zululand; C. J. Dricot, Leopoldville; S. H. O. Jones, Bathurst, Gambia; Yayoichi Karube, Tokyo; Prof. Lambillon, Leopoldville; J. B. Lawson, Ibadan, Nigeria; J. M. Samson, Johannesburg; Prof. J. B. Stewart, Jamaica; K. H. Uttley, Antigua.

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“…To date, only a few studies are documented, with a very limited number of twins, mostly obtained from hospital delivery records or school investigations. Consequently, the reported Chinese twinning rates range from 0.28% to 1.54% (Chen et al, 1987;Lauferm, 1920;Millis, 1959), and in the literature, the twinning rates in Mongoloid populations were usually cited from results in Japan. Gan and Zheng (2002) analyzed the geographical distribution of twinning rates in China.…”

mentioning

confidence: 99%

The Comparison of Twinning Rates Between Urban and Rural Areas in China

Gan

et al. 2007

Twin Res Hum Genet

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Based on the birth record data from the National Vital Statistics in the 1990 Census of China, the present study analyzed the differences between urban and rural areas on monozygotic (MZ) and dizygotic (DZ) twin rates by maternal age in 1989. The twins by zygosity were calculated with Weinberg's differential method. Results show that the MZ and DZ twinning rates in China were associated with maternal age and that there were substantial differences between urban and rural areas. The MZ twinning rates in urban and rural areas were 2.36 pairs and 2.11 pairs per 1000 deliveries respectively, significantly lower than that in most studied populations. Furthermore, our analysis indicated that MZ twinning rates remained relatively constant for mothers under the age group of 36 to 38 years, but rose over this age group in both areas, albeit with a different slope. The DZ twinning rates were strikingly affected by maternal age, but the age for peak DZ rates was found within the age group of 33 to 35 years. In all maternal age groups except for 24 to 26 years, the DZ twinning rates in urban areas were higher than in rural areas. It remains unclear as to why the DZ twinning rates reversed to reach higher values within the older maternal age groups in China, but it is almost certain that the high twinning rates had nothing to do with in vitro fertilization.

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The Frequency of Twinning in Poor Chinese in the Maternity Hospital, Singapore

Cited by 13 publications

References 10 publications

Maternal characteristics of women having twin pregnancies

Maternal characteristics of women having twin pregnancies

The twinning rate in Europe and Africa

The Comparison of Twinning Rates Between Urban and Rural Areas in China

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