Duration Of Human Singleton Pregnancy: A Population‐based Study

  title={Duration Of Human Singleton Pregnancy: A Population‐based Study},
  author={Per Bergsj{\o} and Daniel W. Denman and Howard J Hoffman and Olav Meirik},
  journal={Acta Obstetricia et Gynecologica Scandinavica},
We have analysed the duration of pregnancy for singleton births in Sweden during 1976–80 by means of data from the Swedish Birth Registry. Information, which was obtained from special forms with standard questions, include date of first day of last menstrual period (LMP) and whether that date was considered reliable or not. Recording was done prospectively, starting at the first antenatal visit. In 10% of cases the dates were labelled uncertain. Information on LMP and birth dates, parity, age… 

Temporal trends for pregnancy length in a hospital setting of Southern Spain

  • E. González-MesaE. Villegas
  • Medicine
    Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology
  • 2017
A significant shortening of the duration of pregnancy was observed in the course of the study period, and the mean duration of the singleton and multiple pregnancies was 271 days and 242 days, respectively.

[Definitions of expected date of delivery and post-term delivery].

  • C. Le RayO. Anselem
  • Medicine
    Journal de gynecologie, obstetrique et biologie de la reproduction
  • 2011

Potential pregnancy days lost: an innovative measure of gestational age

This commentary presents a novel way to measure gestational age: the continuous variable “Potential pregnancy days lost,” which counts the missing days between the period until childbirth and the average duration of pregnancy, or the lost weeks.

Recurrence of gestational age in sibships: implications for perinatal mortality.

Since perinatal mortality among preterm infants is dependent on the gestational age in the mother's previous birth, a common threshold of 37 weeks' gestation for defining preterm birth as a risk factor for perInatal death may not be appropriate for all births to all mothers.

Duration of human singleton pregnancy Authors' reply to Geirsson, Persson & Marsal

  • Medicine
  • 1991
The mode of decision-making employed in this Swedish population-based study, based upon ‘collective information’ at the first antenatal visit, as a rule before the twelfth week, is a strength rather than a weakness, and it is reassuring that the figure of 10% persisted unchanged during the five study years.

Changes in data management contribute to temporal variation in gestational duration distribution in the Swedish Medical Birth Registry

Assessment of geographical and temporal changes in the determination of gestational duration and its reporting in Sweden between 1973 and 2012 found that leap years were also associated with significantly higher preterm and lower post-term delivery rates than non-leap years.

Use of time to event analysis to estimate the normal duration of human pregnancy.

This study provides a basis for predicting the probability of labour at a given gestational age at term and confirmed the independent effect of nulliparity on duration of pregnancy.

Recurrence of prolonged pregnancy.

Although moderate, prolonged pregnancies in mother may be a risk factor for prolonged pregnancy in daughter, the familial factor of prolonged pregnancy explains just a minor part of its occurrence in the population (due to small population attributable proportions).

Determination of the Duration of single Pregnancy in Dakar and the Contributing Factors

The Senegalese black woman gives birth on average 6 to 10 days earlier than the Caucasian woman and boys are born a day earlier than girls, according to the e-Perinatal computer database.



Analysis of gestational interval.

Variation of the human menstrual cycle through reproductive life.

Determining the pattern of variation in menstrual history for anticipated intervals needs further study, and the practice of birth control through the use of rhythm methods alone must introduce elements of uncertainty which are serious problems.

Duration of Pregnancy

It will he evident that Dr Montgomery's thirteen cases tend to demonstrate that the ordinary period of human gestation is several days less than 280, the period very generally adopted in this country, but on insufficient grounds, as an accurate statement of the ordinary duration of the function.

Duration of pregnancy and postmaturity.

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    Journal of the American Medical Association
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Revaluation of standards for human fetal growth

  • Submitted for publication January
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Beobachtungen uber die Dauer der Schwangerschaft. Monatsschrift fur Geburtskunde und Frauenkrankheiten

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Uber die Tragzeit post ovulationem

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Die menschliche Schwanger - schaftsdauer

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