Trial reportContraception2017
Effect of BMI and body weight on pregnancy rates with LNG as emergency contraception: analysis of four WHO HRP studies.
Trial report in Contraception, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 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
11 citing papers in PubMed, 50 citations in OpenAlex.
- Emergency contraception for individuals weighing 80 kg or greater: A randomized trial of 30 mg ulipristal acetate and 1.5 mg or 3.0 mg levonorgestrel.Contraception · 2024Trial
- Trial
- Photovoice as a Methodology in Obesity Research: A Scoping Review.Obesity reviews : an official journal of the International Association for the Study of Obesity · 2026Article
- A detailed review of pharmacokinetics/pharmacodynamics of progestogens in oral contraception.Frontiers in endocrinology · 2026Review
- What Every Cardiologist Should Know About Contraception and Reproductive Planning in 2025.Journal of the American Heart Association · 2025Review
- Non-Hormonal Contraception.Journal of clinical medicine · 2023Review
- "My BMI is too high for Plan B." A changing population of women seeking ulipristal acetate emergency contraception online.Women & health · 2020Article
- Levonorgestrel emergency contraception and bodyweight: are current recommendations consistent with historic data?Journal of drug assessment · 2020Article
- Pharmacokinetics of the 1.5 mg levonorgestrel emergency contraceptive in women with normal, obese and extremely obese body mass index.Contraception · 2019Observational
- State of emergency contraception in the U.S., 2018.Contraception and reproductive medicine · 2018Review
- Piroxicam Plus Plan B for Emergency Contraception.Journal of the American Board of Family Medicine : JABFMArticle
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors at 2 institutions in 5 countries.
Funding
Abstract
objectiveTo estimate the effect of increased body weight and body mass index (BMI) on pregnancy rates with levonorgestrel (LNG) 1.5mg used as emergency contraception (EC).
methodsThe study reviewed data from 6873 women in four WHO-HRP randomized trials on EC conducted between 1993 and 2010. Participants took either 1.5mg of LNG as a single dose or in two doses 12h apart, up to 120h of unprotected intercourse. Contraceptive efficacy (pregnancy rates) at different weight and BMI categories was evaluated.
resultsOverall pregnancy rate was low at 1.2%. Pregnancy rates were also low in women weighing over 80kg (0.7%) and who were obese (BMI over 30kg/m
conclusionsPregnancy rates with use of LNG 1.5mg for EC were low at less than 3% across different weight and BMI categories. Pooled analyses showed an increase in pregnancy rates among obese women (BMI more than 30kg/m IMPLICATIONS: Access to LNG as EC should still be promoted to women who need them, and not be restricted in any weight or BMI category, with additional attention for counselling and advice for obese women.
Indexed as
Identifiers
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.