ArticleEpidemiology (Cambridge, Mass.)2009
Validity of self-reported time to pregnancy.
Article in Epidemiology (Cambridge, Mass.), 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 65 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
65 citing papers in PubMed, 104 citations in OpenAlex.
- Is Anti-Müllerian Hormone Associated With Fecundability? Findings From the EAGeR Trial.The Journal of clinical endocrinology and metabolism · 2015Trial
- Preconception low dose aspirin and time to pregnancy: findings from the effects of aspirin in gestation and reproduction randomized trial.The Journal of clinical endocrinology and metabolism · 2015Trial
- Historical Neighborhood Redlining and Fertility in a Cohort of US Black Women.Epidemiology (Cambridge, Mass.) · 2026Article
- Chlordecone exposure in women and time to pregnancy: the Timoun cohort study in Guadeloupe, French West Indies.Environmental health : a global access science source · 2025Article
- Associations of In Utero Exposure to Racial Violence and Reproductive Development: The Bogalusa Heart Study.American journal of human biology : the official journal of the Human Biology Council · 2025Article
- The associations between female fecundability and postpartum breastfeeding: A prospective cohort study.PloS one · 2025Article
- Joint modelling of survival and backwards recurrence outcomes: an analysis of factors associated with fertility treatment in the U.S.Journal of the Royal Statistical Society. Series C, Applied statistics · 2024Article
- Fertility history and intentions of married women, China.Bulletin of the World Health Organization · 2024Article
- Examining attention-deficit/hyperactivity disorder and related behavioral disorders by fertility treatment exposure in a prospective cohort.Annals of epidemiology · 2023Article
- Pregnancy Intention, Changes in Pregnancy Intention, and Pregnancy Incidence Among Female Nurses in North America.JAMA network open · 2023Article
- History of infertility and pregnancy outcomes in Project Viva: a prospective study.BMC pregnancy and childbirth · 2022Article
- The current situation and future directions for the study on time-to-pregnancy: a scoping review.Reproductive health · 2022Article
- Maternal fluoride exposure, fertility and birth outcomes: The MIREC cohort.Environmental advances · 2022Article
- Nitrate in Drinking Water and Time to Pregnancy or Medically Assisted Reproduction in Women and Men: A Nationwide Cohort Study in the Danish National Birth Cohort.Clinical epidemiology · 2022Article
- Trends in time-to-pregnancy in the USA: 2002 to 2017.Human reproduction (Oxford, England) · 2021Article
- Reproductive Health Risks Associated with Occupational and Environmental Exposure to Pesticides.International journal of environmental research and public health · 2021Review
- Changes in Behavior with Increasing Pregnancy Attempt Time: A Prospective Cohort Study.Epidemiology (Cambridge, Mass.) · 2020Article
- The association between preconception body mass index and subfertility among Hispanic and non-Hispanic women: A cross-sectional study from Utah's Pregnancy Risk Assessment Monitoring System survey (2012-2015).The Utah women's health review · 2020Article
- Association between peri-conceptional bisphenol A exposure in women and men and time to pregnancy-The HOPE study.Paediatric and perinatal epidemiology · 2019Article
- Administration of antineoplastic drugs and fecundity in female nurses.American journal of industrial medicine · 2019Article
5 more citing papers are in PubMed but not listed here.
Corrections and comments
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Authors and funding
5 authors at 1 institution in 1 country.
Funding
Abstract
backgroundThe reliability of retrospective time to pregnancy (TTP) has been established, but its validity has been assessed in only 1 study, which had a short follow-up.
methodsNinety-nine women enrolled a decade earlier in a prospective TTP study were queried by means of mailed questionnaires about the duration of time they had required to become pregnant. Their responses were compared with their earlier data from daily diaries (gold standard).
resultsOne-third of women could not recall their earlier TTP either in menstrual cycles or calendar months. Only 17%-19% of women recalled their TTP exactly. Agreement increased to 41%-51%, 65%-72%, and 72%-77% when defined as +/-1, +/-2, and +/-3 months, respectively. Women with longer observed TTPs or previous pregnancies were more likely to under-report their TTP.
conclusionsThe findings raise questions about the commonly assumed validity of self-reported TTP. Recalled TTP may introduce error when estimating fecundability or classifying couples' fecundity status.
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What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.