ArticleBMJ (Clinical research ed.)1998
Bias in meta-analysis detected by a simple, graphical test. Asymmetry detected in funnel plot was probably due to true heterogeneity.
Article in BMJ (Clinical research ed.), 1998. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 240 papers, 152 of them syntheses that pooled 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.
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
240 citing papers in PubMed, 152 syntheses or guidelines pooled it.
- Intravenous vs Oral Iron for Treating Iron Deficiency Anemia in Pregnancy: A Systematic Review and Meta-Analysis.JAMA network open · 2026Pooled it
- Comparative Effectiveness of Noninvasive Brain-Computer Interface-Based Interventions for Upper Limb Rehabilitation in Poststroke Hemiplegia: Systematic Review and Network Meta-Analysis of Randomized Controlled Trials.Journal of medical Internet research · 2026Pooled it
- Mind-Body Therapies for Depression and Anxiety Symptoms in People with Cancer: A Systematic Review with Network Meta-Analysis.Current oncology reports · 2026Pooled it
- Comparison of integrated dual-lag screw versus single lag screw cephalomedullary nails for intertrochanteric femoral fractures: a systematic review and meta-analysis.Journal of orthopaedic surgery and research · 2026Pooled it
- Efficacy and safety of Guanylyl cyclase C agonists (linaclotide and plecanatide) in patients with irritable bowel syndrome with constipation: a systematic review and meta-analysis of randomized controlled trials.Frontiers in pharmacology · 2026Pooled it
- Prevalence of Liver Dysfunction After One-Anastomosis Gastric Bypass: A Systematic Review and Single-Arm Meta-analysis.Obesity surgery · 2025Pooled it
- Genome-Wide Cell-Free DNA Analysis for Aneuploidy Detection in Miscarriages: Test Performance Meta-Analysis.Prenatal diagnosis · 2025Pooled it
- Team based learning pedagogy enhances the education quality: a systematic review and meta-analysis.BMC medical education · 2025Pooled it
- The prevalence of oral mucositis after radiotherapy in patients with Head and Neck Cancer and its associated factors: a meta-analysis.Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico · 2025Pooled it
- Correlation Between Gaze Behaviors and Social Communication Skills of Young Autistic Children: A Meta-Analysis of Eye-Tracking Studies.Journal of autism and developmental disorders · 2025Pooled it
- Neutrophils as indicators of obesity-associated inflammation: A systematic review and meta-analysis.Obesity reviews : an official journal of the International Association for the Study of Obesity · 2025Pooled it
- Men's knowledge of obstetrics danger sign and associated factors in low-income countries: a systematic review and meta-analysis.Scientific reports · 2025Pooled it
- Gonadotropin-releasing hormone agonist protocols for pituitary suppression in assisted reproduction.The Cochrane database of systematic reviews · 2025Pooled it
- Antibiotic resistance rates inFrontiers in microbiology · 2025Pooled it
- Prediabetes in adult Saudis: a systematic review & meta-analysis of prevalence studies (2000-2024).PeerJ · 2025Pooled it
- Pooled it
- Prognostic and clinicopathological value of dbc1 expression in human cancers: a systematic review and meta-analysis.Frontiers in oncology · 2025Pooled it
- Early cessation of exclusive breastfeeding and associated factors in Ethiopia: a systematic review and meta-analysis.Frontiers in nutrition · 2025Pooled it
- Efficacy of repeated peripheral magnetic stimulation on upper limb motor function after stroke: a systematic review and meta-analysis of randomized controlled trials.Frontiers in neurology · 2025Pooled it
- Assessment of salivary matrix metalloproteinase (MMP8) and activated salivary matrix metalloproteinase (aMMP8) in periodontitis patients: a systematic review and meta-analysis.Frontiers in oral health · 2025Pooled it
180 more citing papers are in PubMed but not listed here.
Corrections and comments
- Comment on
Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
PubMed holds no abstract for this paper.
Indexed as
Identifiers
9492685PMC2665578What 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.