Analysis of gestational interval
| Autor: | Alan E. Treloar, Donald W. Cowan, Borghild G. Behn |
|---|---|
| Rok vydání: | 1967 |
| Předmět: |
Adult
Gynecology medicine.medical_specialty Pregnancy Percentile Labor Obstetric Menstrual History business.industry Obstetrics media_common.quotation_subject Last menstrual period Coitus Obstetrics and Gynecology medicine.disease Menstruation Interval (music) Humans Gestation Medicine Female business Menstrual cycle media_common |
| Zdroj: | American Journal of Obstetrics and Gynecology. 99:34-45 |
| ISSN: | 0002-9378 |
| DOI: | 10.1016/s0002-9378(16)34488-x |
| Popis: | The last menstrual period (LMP) date is a benchmark for duration of each pregnancy for lack of any readily available alternative. The derived interval, wrongly referred to as “weeks of gestation,” is assessed critically with respect to its dependability in terms of over 2,000 live births for which the LMP onset was currently recorded in a study of menstrual history. The derived gestational interval is statistically defined by a smooth probability curve ranging from 225 to 312 days when each extreme percentile of cases is ignored. Seventy per cent of all live births occur within 280 ± 10 days. 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. It is clear also that unrecognized abortions preceding a durable pregnancy without an intervening menstruation must contribute to long gestational intervals. Women generally report to obstetricians with well-informed and dependable information concerning the LMP date. |
| Databáze: | OpenAIRE |
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