Evidence map›Paper›PMID 28065408›Full record

ArticleFertility and sterility2017

Prospective evaluation of luteal phase length and natural fertility.

Natalie M Crawford, David A Pritchard, Amy H Herring, Anne Z Steiner

Registry-linked trialAbstract read
In one paragraph

Article in Fertility and sterility, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT01028365 (Time to Conceive), which is not on this map. Cited by 25 papers.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed
5.8field-weighted citation impact, top 4% of its field
1 · What the graph read from it

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.

2 · The registry

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.

NCT01028365 completednot on this map

Time to Conceive: A Study of Fertility: Biomarkers of Fertility

TypeobservationalSponsorUniversity of North Carolina, Chapel HillRan2008 to 2016Enrolled843ConditionsHealthyArmsNo intervention
3 · Its place in the literature

Who cites it

25 citing papers in PubMed, 61 citations in OpenAlex.

  1. Observational
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  5. Oura Ring as a Tool for Ovulation Detection: Validation Analysis.Journal of medical Internet research · 2025
    Article
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  17. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 1 institution in 1 country.

Natalie M CrawfordDepartment of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, North Carolina. Electronic address: nmcraw@gmail.com.
David A PritchardDepartment of Biostatistics, University of North Carolina, Chapel Hill, North Carolina.
Amy H HerringDepartment of Biostatistics, University of North Carolina, Chapel Hill, North Carolina.
Anne Z SteinerDepartment of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, North Carolina.
University of North Carolina at Chapel Hill · US

Funding

Research Services CoreP2CHD050924 · NICHD · UNIV OF NORTH CAROLINA CHAPEL HILL · PI KAREN B GUZZO · 2015 to 2026
$9.6M
Biomarkers of InfertilityR01HD067683 · NICHD · UNIV OF NORTH CAROLINA CHAPEL HILL · PI STEINER, ANNE ZWEIFEL · 2011 to 2015
$2.7M
Time to ConceiveR21HD060229 · NICHD · UNIV OF NORTH CAROLINA CHAPEL HILL · PI STEINER, ANNE ZWEIFEL · 2009 to 2010
$407k
NICHD NIH HHS P2C HD050924NICHD NIH HHS R01 HD067683NICHD NIH HHS R21 HD060229
6 · The paper itself

Abstract

objectiveTo evaluate the impact of a short luteal phase on fecundity.

designProspective time-to-pregnancy cohort study.

settingNot applicable. PATIENT(S): Women trying to conceive, ages 30-44 years, without known infertility. INTERVENTION(S): Daily diaries, ovulation prediction testing, standardized pregnancy testing. MAIN OUTCOME MEASURE(S): Subsequent cycle fecundity. RESULT(S): Included in the analysis were 1,635 cycles from 284 women. A short luteal phase (≤11 days including the day of ovulation) occurred in 18% of observed cycles. Mean luteal phase length was 14 days. Significantly more women with a short luteal phase were smokers. After adjustment for age, women with a short luteal phase had 0.82 times the odds of pregnancy in the subsequent cycle immediately following the short luteal phase compared with women without a short luteal phase. Women with a short luteal length in the first observed cycle had significantly lower fertility after the first 6 months of pregnancy attempt, but at 12 months there was no significant difference in cumulative probability of pregnancy. CONCLUSION(S): Although an isolated cycle with a short luteal phase may negatively affect short-term fertility, incidence of infertility at 12 months was not significantly higher among these women. CLINICAL TRIAL REGISTRATION NUMBER: NCT01028365.

Indexed as

FertilityTime-to-PregnancyAdultFemaleHumansKaplan-Meier EstimateLuteal PhaseOdds RatioOvulation DetectionOvulation PredictionPregnancyPregnancy TestsProportional Hazards ModelsProspective StudiesRisk FactorsTime Factorsfecundityluteal phase deficiencynatural fertilityShort luteal phase

Identifiers

PMID28065408
PMCPMC5337433
OpenAlexW2568959601

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

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.