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11,326 real negative results, null findings, and replication failures in Medicine · Negative / Null Result Report. Search the index →

WASTE indexes published research — it does not host or republish full papers. Each entry is a metadata record compiled from open scholarly databases; the abstract is shown in full only where the paper is openly licensed, otherwise a short excerpt under fair use. Classifications are automated and approximate.

Negative / Null Result ReportOpen accessMedicine

Non-invasive prenatal testing in mitigating concerns from invasive prenatal diagnostic testing: retrospective assessment of utility in an academic healthcare system in the US

Kibum Kim, Linda Kaitlyn Craft · 2022 · BMJ Open

Objective Non-invasive prenatal testing (NIPT) is a front-line screening for fatal chromosomal aneuploidy. In pregnant women with a risk of having fetal congenital disorders, NIPT is anticipated to reduce the needs of invasive prenatal diagnostic test (IPD). The objective of this study was to understand the acceptance of NIPT and the utility of NIPT to mitigate concerns about IPD in the US high-risk pregnancy management.Design and setting This was a retrospective observational research using healthcare records obtained from an academic healthcare system in the US. The study consisted of site-l

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Negative / Null Result ReportOpen accessMedicine

Knowledge, attitudes, and practices of community pharmacists regarding obesity management: A cross-sectional study

Haure Osman Muhammad Hamadamin, Samir Mahmood Othman · 2026 · Zanco Journal of Medical Sciences

Background and objective: Obesity is a chronic, multifactorial condition characterized by an excessive accumulation of body fat that presents significant health risks. Community pharmacists, for instance, are highly accessible and often serve as the first point of contact for patients seeking advice on weight management. This study aims to fill a research gap by evaluating community pharmacists’ knowledge, attitudes, and practices related to obesity and weight management. Methods: A cross-sectional study was carried out among 331 community pharmacists among different pharmacy settings in Erbil

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Negative / Null Result ReportOpen accessMedicine

Macrophage numbers in the marginal area of sarcomas predict clinical prognosis

Michinobu Umakoshi, Akiko Nakamura, Hiroyuki Tsuchie et al. · 2023 · Scientific Reports

Abstract Even when treated comprehensively by surgery, chemotherapy, and radiotherapy, soft-tissue sarcoma has an unfavorable outcome. Because soft-tissue sarcoma is rare, it is the subject of fewer clinicopathological studies, which are important for clarifying pathophysiology. Here, we examined tumor-associated macrophages in the intratumoral and marginal areas of sarcomas to increase our knowledge about the pathophysiology. Seventy-five sarcoma specimens (not limited to a single histological type), resected at our institution, were collected, and the number of CD68-, CD163-, and CD204-posit

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Negative / Null Result ReportOpen accessMedicine

Study of sociodemographic factors and perceptions of women in the reproductive age group with anaemia – A hospital-based cross-sectional study in South India

N Bushra Thasneem, Resmi S. Kaimal, Abdul Hakeem Thengu Murichathil · 2025 · Journal of Family Medicine and Primary Care

Introduction: Anaemia is one of the significant public health problems faced by developing countries. It occurs more frequently in women of childbearing age. Anaemia causes poor work capacity, and severe forms may even cause cardiac failure. In pregnant women, anaemia may lead to preterm labour, low-birth-weight babies, and increased risk of maternal mortality due to post-partum haemorrhage. Even though there are national programmes to supply iron free of cost and other measures to tackle anaemia, it is still prevalent in our country. Anaemia prevalence has increased between NFHS-4 and NFHS-5,

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Negative / Null Result ReportOpen accessMedicine

Population-based cohort study: proton pump inhibitor use during pregnancy in Sweden and the risk of maternal and neonatal adverse events

Esmee M. Breddels, Johanna Simin, Romina Fornes et al. · 2022 · BMC Medicine

Abstract Background Approximately half of all women suffer from heartburn at some stage during pregnancy. The most effective treatment is proton pump inhibitors, but the safety of use during pregnancy cannot be guaranteed. This study aimed to elucidate the effect of proton pump inhibitors on the risk of pre-eclampsia, gestational diabetes mellitus, preterm birth, an Apgar score at 5 min below 7, and a child being small or large for its gestational age. Methods This Swedish population-based study included 1,089,514 live singleton deliveries between July 2006 and December 2016 in Sweden. Multipl

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Negative / Null Result ReportOpen accessMedicine

DIASTASIS RECTI ABDOMINIS AND ITS ASSOCIATED RISK FACTORS IN POSTPARTUM WOMEN

Muhammad Hussain Iqbal, Tanveer Hussain, Fariha Khalid et al. · 2020 · Pakistan Armed Forces Medical Journal

Objective: To determine the frequency of diastasis recti abdominis and its associated risk factors in postpartum women. Study Design: Cross-sectional study. Place and Duration of Study: Omar Medical Center Lahore, Yaseen Medical Center Lahore and Social Security Hospital Lahore, from Sep 2019 to Dec 2019. Methodology: This study included 128 participants fulfilling the eligibility criteria. The assessment of diastasis recti abdominis was done manually by a female physiotherapist using single finger, double finger and three finger methods on abdomen at three levels: at the umbilicus, 4.5 cm bel

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Negative / Null Result ReportMedicine

Left Atrial Volume and Strain by Two-Dimensional Versus Three-Dimensional Echocardiography in Healthy Subjects: Reference Values are Not Interchangeable.

Li L, You C, Yan X et al. · 2026 · Echocardiography (Mount Kisco, N.Y.)

Background Little is known about the differences in left atrial (LA) volume and strain assessed with two-dimensional (2DE) and three-dimensional echocardiography(3DE). Therefore, this study aimed to compare 2DE and 3DE parameters in…

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Negative / Null Result ReportMedicine

Prognostic Value of Serum Concentrations of Interleukin-6 and Interleukin-8 in Dermal Burn Injuries Among Pediatric Patients.

Kralj R, Barčot Z, Kurtanjek M et al. · 2026 · Journal of burn care & research : official publication of the American Burn Association

The primary aim of this study was to determine whether a significant correlation exists between the relative decline in serum concentrations of interleukin-6 (IL-6) and interleukin-8 (IL-8) between the third and eighth days after injury…

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Negative / Null Result ReportMedicine

Is prenatal testosterone-estrogen balance related to adolescent idiopathic scoliosis? A case-control study using digit ratio (2D:4D).

Yaka H, Küçükşen MF, Adem A et al. · 2026 · Early human development

Background Adolescent idiopathic scoliosis (AIS) exhibits a marked sexual dimorphism, with females up to ten times more likely than males to develop curves exceeding 30°, strongly implicating sex hormone signalling in its pathogenesis. The…

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Negative / Null Result ReportOpen accessMedicine

Lack of impact of OCTN1 gene polymorphisms on clinical outcomes of gabapentinoids in Pakistani patients with neuropathic pain.

Abida Shaheen, Syed Mahboob Alam, Fahad Azam et al. · 2022 · PLoS ONE

Background and objective Gabapentinoids are the first-line drugs for neuropathic pain. These drugs are the substrate of organic cation transporter (OCTN1) for renal excretion and absorption across the intestinal epithelium. Gabapentinoids exhibit wide interindividual variability in daily dosage and therapeutic efficacy which makes titration regimens prolonged for optimal efficacy. The present study aimed to investigate the possible influence of the single nucleotide polymorphism (SNP) of OCTN1 on therapeutic efficacy and safety of gabapentinoids in neuropathic pain patients of the Pakistani po

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Negative / Null Result ReportOpen accessMedicine

The effect of low serum bicarbonate values on the onset of action of local anesthesia with vertical infraclavicular brachial plexus block in patients with End-stage renal failure

Al-mustafa Mahmoud, Massad Islam, Alsmady Moaath et al. · 2010 · Saudi Journal of Kidney Diseases and Transplantation

Vertical infraclavicular brachial plexus block is utilized in patients with chronic renal failure at the time of creation of an arterio-venous fistula (AVF). The aim of this study is to test the effect of impaired renal function, with the resulting deranged serum electrolytes and blood gases, on the success rate and the onset of action of the local anesthetics used. In this prospective clinical study, we investigated the effect of the serum levels of sodium, potassium, urea, crea-tinine, pH, and bicarbonate on the onset of action of a mixture of lidocaine and bupivacaine administered to create

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Negative / Null Result ReportMedicine

Essential oil chemical composition, antimicrobial, anticancer, and antioxidant effects of Thymus convolutus Klokov in Turkey

Selma Celen Yuceturk, Sumeyye Aydogan Turkoglu, F. Kockar et al. · 2021 · Zeitschrift für Naturforschung C - A Journal of Biosciences

Abstract In this study, the chemical composition, antimicrobial, antioxidant, and anticancer effects of Thymus convolutus Klokov oil and its main compound camphor were investigated. The oil was isolated from T. convolutus using…

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Negative / Null Result ReportOpen accessMedicine

Qualitative Assessment of Cerebral Perfusion in Post Stroke Seizure Patients using Arterial Spin Labeling: A Case-control Study

Anjali B Susan, Uttam B George, Jeyaraj D Pandian · 2022 · Journal of Clinical and Diagnostic Research

Introduction: Arterial Spin Labeling-Perfusion Weighted Imaging (ASL-PWI) assesses cerebral blood flow using magnetically labeled inflowing arterial blood water protons as freely diffusible tracer without exogenous contrast agent. Seizures are one of the sequelae of stroke with its mechanism not well studied. Aim: Qualitative assessment of cerebral perfusion in post stroke seizure patients using ASL-PWI and comparison of perfusion patterns in post stroke seizure patients and stroke patients. Materials and Methods: This was a case-control study among 100 stroke patients who underwent Magnetic R

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Negative / Null Result ReportOpen accessMedicine

Frequency of Raised Intraocular Pressure after Nd: Yag Laser Capsulotomy in Pseudophakic Patients

Zoya maqsood , Shahid Jamal Siddiqui, Nimarta Bai et al. · 2025 · Journal of the Dow University of Health Sciences

Objective: To determine the frequency of raised intraocular pressure (IOP) following neodymium-doped yttrium aluminum garnet (Nd:YAG) laser capsulotomy in pseudophakic patients and to compare outcomes between high- and low-energy procedures. Methods: This descriptive cross-sectional study was conducted at the Department of Ophthalmology, Khairpur Medical College / Civil Hospital, Khairpur Mirs, Pakistan from April to September 2024. A total of 139 pseudophakic patients with posterior capsular opacification (PCO) undergoing Nd:YAG capsulotomy were enrolled. Baseline demographic and clinical dat

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Negative / Null Result ReportOpen accessMedicine

The association between smartphone addiction and dry eye disease: A cross-sectional study

Ayman Mohammed Baabdullah, Abdulmalik Ghassan Abumohssin, Yara Aedh Alqahtani et al. · 2019 · Journal of Nature and Science of Medicine

Background: The use of smartphones has increased exponentially. Excessive usage of smartphones has been shown to have a negative impact on ocular health. This study aimed to evaluate the relationship between smartphone addiction and dry eye disease (DED) and determine the risk factors of DED in participants associated with smartphone addiction. Materials and Methods: This cross-sectional study was conducted in May 2017. Participants were selected from the Faculty of Medicine at King Abdulaziz University in Jeddah, Saudi Arabia. Stratified random sampling technique was used to recruit participa

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Negative / Null Result ReportOpen accessMedicine

Circulating levels of sclerostin are associated with cardiovascular mortality.

Cristina Novo-Rodríguez, Beatriz García-Fontana, Juan De Dios Luna-Del Castillo et al. · 2018 · PLoS ONE

Cardiovascular diseases are a health problem throughout the world, especially in people with diabetes. The identification of cardiovascular disease biomarkers can improve risk stratification. Sclerostin is a modulator of the Wnt/β-catenin signalling pathway in different tissues, and it has recently been linked to vascular biology. The current study aimed to evaluate the relationship between circulating sclerostin levels and cardiovascular and non-cardiovascular mortality in individuals with and without type 2 diabetes. We followed up a cohort of 130 participants (mean age 56.8 years; 48.5% fem

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Negative / Null Result ReportOpen accessMedicine

Ocular manifestations of COVID-19: facts and figures from a tertiary care center

Nissar Shaikh, Huda Al Mahdi, Anant Pai et al. · 2022 · Annals of Medicine

Introduction COVID-19 patients presenting with ocular manifestations are from 0.8% to 32% of patients seen in the ED. The available literature is scarce regarding COVID-19 patients presenting with ocular manifestations from the Middle Eastern region. Purpose This study aims to report the incidence of ocular signs and symptoms in COVID-19 patients and find any correlation between the occurrence of ocular manifestations and patients’ comorbidities. Methods All patients having the primary diagnosis of COVID-19 infection and concurrent ocular manifestations on admission to our tertiary COVID-19 he

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Negative / Null Result ReportOpen accessMedicine

Discordance in gender role attitudes between spouses and its relationship with the risk biomarkers of cardiovascular diseases: a couple-level analysis

Kiho Sung, Junsol Kim, Yeong-Ran Park et al. · 2026 · Scientific Reports

Abstract Cardiovascular disease (CVD) is prevalent among older adults, but studies often focus on individual spouses rather than couple dynamics. This study examines how interplay between spouses—specifically discordance in gender role attitudes—relates to CVD risk biomarkers, using couple-matched data from the Korean Social Life, Health, and Aging Project (KSHAP) on 308 older married couples (616 individuals). Actor-partner interdependence models (APIM) reveal that discordant gender role attitudes are significantly associated with higher CVD risk markers—higher systolic blood pressure, higher

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Negative / Null Result ReportOpen accessMedicine

Polymorphisms of estrogen metabolism-related genes ESR1 , UGT2B17 , and UGT1A1 are not associated with osteoporosis in artificial menopausal Japanese women

Megumi Yokota, Akira Hirasawa, Kazuya Makita et al. · 2015 · Menopause Review

Introduction : Bilateral salpingo-oophorectomy (BSO) is a risk factor for osteoporosis. Previous studies have reported an association between genetic polymorphisms and the risk of developing osteoporosis. However, the relationship between osteoporosis and genetic polymorphisms in Japanese women treated with BSO is not well understood. To improve the quality of life for post-BSO patients, it is important to determine the genetic factors that influence their risk for osteoporosis. The aim of this study was to investigate the association between gene variations of estrogen metabolism-related gene

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Negative / Null Result ReportOpen accessMedicine

The Role of Serum Beta-Trace Protein in the Diagnosis and Prognosis of Sepsis Patients in the Emergency Department

Mehmet Yortanlı, Ramazan Köylü, Öznur Köylü et al. · 2025 · Eurasian Journal of Emergency Medicine

Aim: This study aimed to evaluate the diagnostic and prognostic significance of serum beta-trace protein (BTP) levels in patients diagnosed with sepsis in the emergency department. Materials and Methods: This prospective, single-center, observational clinical study was conducted in the emergency department and intensive care unit of a tertiary hospital. A total of 104 sepsis patients and 48 healthy adult volunteers who presented to the emergency department between April 2015 and October 2015 were included. Blood samples were collected on days 1 and 3, and BTP levels were measured using the ELI

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Negative / Null Result ReportOpen accessMedicine

Influence of Ergonomic Breastfeeding on Risk of Developing Musculoskeletal Disorders on Lactating Mothers and Quality of Infant’s Latch: A Quasi-experimental Study

Aditi Prayag, Salima Bijapuri, Shweta Bhatbolan et al. · 2025 · Journal of Clinical and Diagnostic Research

Introduction: Breastmilk is recognised as the best infant nutrition, but Exclusive Breastfeeding (EBF) rates remain as low as 63.7% in India and 48% worldwide. One barrier is the development of Musculoskeletal Disorders (MSDs) in postpartum mothers due to a lack of education on proper breastfeeding posture. These factors can impact the quality of the infant’s latch, resulting in early cessation of breastfeeding. Aim: This study aimed to assess the impact of ergonomic breastfeeding on the risk of developing MSD in lactating mothers and infant latch quality. Materials and Methods: The present qu

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Negative / Null Result ReportOpen accessMedicine

The association between physical activity and atrial fibrillation applying the Heaviside function in survival analysis: the Multi-Ethnic Study of Atherosclerosis

Yaser Mokhayeri, Seyed Saeed Hashemi-Nazari, Mohammad Ali Mansournia et al. · 2017 · Epidemiology and Health

OBJECTIVES Although the effect of physical activity (PA) on the incidence of atrial fibrillation (AF) has been studied, contradictory results have been reported. Such discrepancies may reflect the different effects of various types of PA upon AF, as well as gender interactions. Therefore, we aimed to evaluate the associations of PA types (total, moderate/vigorous, and intentional), as well as walking pace, with AF risk in men and women. METHODS Using the Multi-Ethnic Study of Atherosclerosis Typical Week Physical Activity Survey, 3 PA measures and walking pace were calculated among 6,487 men a

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Negative / Null Result ReportOpen accessMedicine

A U-shaped association between blood selenium levels and prostate cancer: findings of a case-control study among Nigerian men

Onyinyechi Bede-Ojimadu, Nwakasi Nnamah, Jude A. Onuegbu et al. · 2025 · Scientific Reports

Abstract The ability of selenium to both prevent and induce cancer at varying biological concentrations has been reported in previous studies. We studied the associations between selenium exposure and prostate diseases such as prostate cancer (PCa) and benign prostatic hyperplasia (BPH), and estimated the optimal range of selenium concentrations that may be needed to prevent these diseases among Nigerian men. Blood and urine samples from men with histologically diagnosed PCa (n = 90), BPH (n = 97), and controls (n = 98) were analyzed for trace elements, including selenium. The associations bet

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Negative / Null Result ReportOpen accessMedicine

From Conspiracy to Hesitancy: The Longitudinal Impact of COVID-19 Vaccine Conspiracy Theories on Perceived Vaccine Effectiveness

Camila Salazar-Fernández, María José Baeza-Rivera, Diego Manríquez-Robles et al. · 2023 · Vaccines

The embrace of coronavirus disease 2019 (COVID-19) vaccine conspiracies has been linked to vaccine hesitancy. This study aimed to investigate the relationship between COVID-19 vaccine conspiracy theories and perceived vaccine effectiveness. The study utilized a longitudinal follow-up study in which adults in Chile completed surveys in December 2020 (T1) and May 2021 (T2). The psychometric properties of the five-item instrument on conspiracy theories for the COVID-19 vaccine were evaluated using data from T1 ( n = 578). A confirmatory one-factor structure with suitable indicators of reliability

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Negative / Null Result ReportOpen accessMedicine

Plant-based dietary patterns defined by a priori indices and colorectal cancer risk by sex and race/ethnicity: the Multiethnic Cohort Study

Jihye Kim, Carol J. Boushey, Lynne R. Wilkens et al. · 2022 · BMC Medicine

Abstract Background Plant-based diets assessed by a priori indices are associated with health outcomes. This study investigated the associations between pre-defined indices of plant-based diets and risk of colorectal cancer (CRC) and evaluated whether the association varies by sex, race and ethnicity, and anatomic subsite of tumors. Methods A total of 79,952 men and 93,475 women who participated in the Multiethnic Cohort Study were included. Primary outcome was incidence of invasive CRC. Cox models were used to estimate the risk of CRC across quintiles of three plant-based diet scores: overall

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Negative / Null Result ReportOpen accessMedicine

Effect of smoking status on clinical outcomes after reperfusion therapy for acute ischemic stroke

Fumi Irie, Ryu Matsuo, Satomi Mezuki et al. · 2024 · Scientific Reports

Abstract Smoking has detrimental effects on the cardiovascular system; however, some studies have reported better clinical outcomes after thrombolysis for ischemic stroke in smokers than in nonsmokers, a phenomenon known as the smoking paradox. Therefore, this study aimed to examine the smoking paradox in patients with ischemic stroke receiving reperfusion therapy. Data were collected from a multicenter hospital-based acute stroke registry in Fukuoka, Japan. The 1148 study patients were categorized into current and noncurrent smokers. The association between smoking and clinical outcomes, incl

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Negative / Null Result ReportOpen accessMedicine

Lack of association between interleukin 13, interleukin 4 receptor alpha, andMS4A2 gene polymorphisms and asthma in adult Saudis

Eman A Al Abdulsalam, Mohamed S Al-Hajjaj, Mohammad S Alanazi et al. · 2020 · Journal of Nature and Science of Medicine

Objectives: Several genes, including interleukin-13 (IL13), MS4A2, and IL 4 receptor alpha (IL4Rα), have been shown to associate with the inflammatory process in asthma. We investigated the possible association between asthma and five single-nucleotide polymorphisms (SNPs) in the IL13, IL4Rα, and MS4A2 gene in comparison with the level of the IL-13 protein in the Saudi asthmatics and controls. Subjects and Methods: The study group included 50 adult asthmatic patients and 50 normal healthy controls. Blood was extracted, and DNA was prepared. Genotyping was performed on DNA using direct sequenci

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Negative / Null Result ReportOpen accessMedicine

Changing the antibiotic prescribing of Australian general practice registrars’ for acute respiratory tract infections: a non-randomized controlled trial

Alexandria Turner, Mieke L van Driel, Ben Mitchell et al. · 2025 · Family Practice

Abstract Background Inappropriate antibiotic prescription for self-limiting respiratory tract infections (RTIs) by general practitioner (GP) registrars (trainees) is less common than by established GPs but still exceeds evidence-based…

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Negative / Null Result ReportOpen accessMedicine

Maternal exposure to childhood maltreatment and adverse birth outcomes

Lauren S. Keenan-Devlin, Ann E. B. Borders, Alexa Freedman et al. · 2023 · Scientific Reports

Abstract Exposure to traumatic events during pregnancy may influence pregnancy and birth outcomes. Growing evidence suggests that exposure to traumatic events well before pregnancy, such as childhood maltreatment (CM), also may influence the course of pregnancy and risk of adverse birth outcomes. We aimed to estimate associations between maternal CM exposure and small-for-gestational-age birth (SGA) and preterm birth (PTB) in a diverse US sample, and to examine whether common CM-associated health and behavioral sequelae either moderate or mediate these associations. The Measurement of Maternal

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