Duration Of Human Singleton Pregnancy: A Population‐based Study

  title={Duration Of Human Singleton Pregnancy: A Population‐based Study},
  author={Per B 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… Expand
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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. Expand
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Ultrasound was more accurate than LMP in dating, and when it was used the number of postterm pregnancies decreased and combining more than one ultrasonic measurements did not improve dating accuracy. Expand
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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. Expand
Duration of human singleton pregnancy Authors' reply to Geirsson, Persson & Marsal
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A degree of error is inherent in every assessment of gestational age when the date of conception is not known with certainty. This is true both of the individual case and sets of cases. There areExpand
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. Expand
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. Expand
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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). Expand
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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. Expand


Analysis of gestational interval.
Evidence available from isolated coitus data and other sources indicates that short gestational intervals are partly ascribable to rhythmic cyclic vaginal bleedings not distinguishable by the patient from normal menstrual flows. Expand
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. Expand
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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. Expand
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