Matches in SemOpenAlex for { <https://semopenalex.org/work/W2034163547> ?p ?o ?g. }
Showing items 1 to 55 of
55
with 100 items per page.
- W2034163547 endingPage "59" @default.
- W2034163547 startingPage "57" @default.
- W2034163547 abstract "Westoff Bumpass and Ryder (1969) conclude that no difference exists in the time required to conceive between women who have used oral contraception (OC) and women who have used other contraceptive methods. Yet the data on which this conclusion is based suggest a different interpretation. A table summarizes the data. Essentially the table is an extract of a life table in which only the probability of survival without becoming pregnant to the end of each ordinal month is shown. If the inversion of determining the monthly probabilities of conception among the monprgnant survivors of the preceding month is performed an intriguing and suggestive pattern emerges. Because of the progressive selecting out of women with the highest fecundability a progressive secular reduction in the proportion becoming pregnant in each successive month is expected and this is the case for women who have discontinued other forms of contraception than OC. The peak at 6 months is presumably no more than an example of round number preference. With the OC users this pattern does not emerge. A marked bimodality is present strongly suggesting that the use of OC divides women into 2 population with distinct characteristics. The characteristics of these populations must be such as to explain the very much lower conception rate of the OC users in the first 2 months. The authors explain this difference as being due in part to a higher rate of accidental pregnancy among users of less efficient methods and partly to lack of sophistication among users of other methods in interpreting the question of how long it takes to become pregnant. Neither of these explanations accounts for the finding that pregnancy appears more likely in the 3rd month than the 2nd and more likely in the 4th month than the 3rd after discontinuance of OC. It is the OC users pattern which is abnormal and unexpected so that it seems more likely that some factor is acting to depress their fecundability than the results for other users are distorted. It is assumed that there are 2 populations of OC users 1 of which (about 80% of users) is unaffected by OC use. The other population experiences a carryover of the contraceptive effect of the pill either for 2 or for 3 months after discontinuance. A table shows the monthly probabilities of conception deduced from this model and compares them with those actually found. In every month (except the 6th) the fit is so close that no more than 1 pregnancy in the study group of 110 women separates the 2 figures. It is concluded that for 20% of OC users there is a delay of either 2 or 3 months before their capacity to conceive is restored. This is most likely due to the persistence for this time of anovulatory cycles." @default.
- W2034163547 created "2016-06-24" @default.
- W2034163547 creator A5046680520 @default.
- W2034163547 date "1970-03-01" @default.
- W2034163547 modified "2023-10-06" @default.
- W2034163547 title "The probability of conception after discontinuance of oral contraception: A note on “oral contraception, coital frequency, and the time required to conceive,” by Westoff, Bumpass, and Ryder" @default.
- W2034163547 cites W2039606712 @default.
- W2034163547 doi "https://doi.org/10.1080/19485565.1970.9987843" @default.
- W2034163547 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/5538242" @default.
- W2034163547 hasPublicationYear "1970" @default.
- W2034163547 type Work @default.
- W2034163547 sameAs 2034163547 @default.
- W2034163547 citedByCount "12" @default.
- W2034163547 crossrefType "journal-article" @default.
- W2034163547 hasAuthorship W2034163547A5046680520 @default.
- W2034163547 hasConcept C131872663 @default.
- W2034163547 hasConcept C2779076696 @default.
- W2034163547 hasConcept C2908647359 @default.
- W2034163547 hasConcept C2908662513 @default.
- W2034163547 hasConcept C29456083 @default.
- W2034163547 hasConcept C2986817661 @default.
- W2034163547 hasConcept C512399662 @default.
- W2034163547 hasConcept C71924100 @default.
- W2034163547 hasConcept C99454951 @default.
- W2034163547 hasConceptScore W2034163547C131872663 @default.
- W2034163547 hasConceptScore W2034163547C2779076696 @default.
- W2034163547 hasConceptScore W2034163547C2908647359 @default.
- W2034163547 hasConceptScore W2034163547C2908662513 @default.
- W2034163547 hasConceptScore W2034163547C29456083 @default.
- W2034163547 hasConceptScore W2034163547C2986817661 @default.
- W2034163547 hasConceptScore W2034163547C512399662 @default.
- W2034163547 hasConceptScore W2034163547C71924100 @default.
- W2034163547 hasConceptScore W2034163547C99454951 @default.
- W2034163547 hasIssue "1" @default.
- W2034163547 hasLocation W20341635471 @default.
- W2034163547 hasLocation W20341635472 @default.
- W2034163547 hasOpenAccess W2034163547 @default.
- W2034163547 hasPrimaryLocation W20341635471 @default.
- W2034163547 hasRelatedWork W2408175853 @default.
- W2034163547 hasRelatedWork W2625843210 @default.
- W2034163547 hasRelatedWork W4299665394 @default.
- W2034163547 hasRelatedWork W4300181646 @default.
- W2034163547 hasRelatedWork W2156330893 @default.
- W2034163547 hasRelatedWork W2218600252 @default.
- W2034163547 hasRelatedWork W2274789917 @default.
- W2034163547 hasRelatedWork W2295735787 @default.
- W2034163547 hasRelatedWork W2307642864 @default.
- W2034163547 hasRelatedWork W2622432039 @default.
- W2034163547 hasVolume "17" @default.
- W2034163547 isParatext "false" @default.
- W2034163547 isRetracted "false" @default.
- W2034163547 magId "2034163547" @default.
- W2034163547 workType "article" @default.