Negative / Null Result Report
Eggeling-Böcker M, Karabetsos E, Christopoulou M et al. · 2025 · Preprint
Background: Technological advancements, such as the introduction of the fifth generation technology standard 5G, offer opportunities but also raise concerns. Although no evidence suggests negative effects of radiofrequency electromagnetic…
View details →DOI: 10.12688/openreseurope.19236.2 Negative / Null Result ReportMedicine
Park K, Özgüroğlu M, Vansteenkiste J et al. · 2021 · Lung cancer (Amsterdam, Netherlands)
Objectives The JAVELIN Lung 200 phase 3 trial did not meet its primary endpoint of improving overall survival (OS) with avelumab vs docetaxel in patients with platinum-treated PD-L1+ NSCLC. We report post hoc analyses assessing the effects…
View details →DOI: 10.1016/j.lungcan.2021.01.026 Negative / Null Result ReportMedicine
Ponce H, Cordero R, Tran J et al. · 2025 · Journal of patient experience
In a prior study, communication scholar ratings of clinician communication effectiveness did not correlate with perceived clinician empathy, which is one aspect of patient experience. We repeated the analysis with a different rating of…
View details →DOI: 10.1177/23743735251323674 Negative / Null Result ReportOpen accessMedicine
Neter E, Youngmann R, Gruper N · 2025 · JMIR formative research
Unlabelled Associations between eHealth literacy and mental health literacy were examined; no significant association was identified between overall eHealth and mental health literacy and only weak associations between specific skills were…
View details →DOI: 10.2196/76812 Negative / Null Result ReportOpen accessMedicine
Pienkos S, Swank Z, Hamlin RE et al. · 2025 · Open forum infectious diseases
Plasma samples obtained approximately 3 ( n = 100) and 12 months ( n = 78) after acute SARS-CoV-2 infection were tested for S1, spike, and N antigens. There were no significant differences in plasma proteins or single-cell protein…
View details →DOI: 10.1093/ofid/ofaf515 Negative / Null Result ReportOpen accessMedicine
Wesley CD, Strange JE, Holt A et al. · 2025 · European heart journal open
Aims Fluoroquinolones (FQ) have been associated with aortic aneurysm and aortic dissection (AA/AD) resulting in an official warning. Recently, large-scale epidemiological studies failed to confirm this. Methods and results The current…
View details →DOI: 10.1093/ehjopen/oeaf021 Negative / Null Result ReportOpen access
Physical activity has many health and psychological benefits, however many programs aimed at increasing physical activity have failed to show the expected results. This may be because when people increase their level of exercise, they…
Negative / Null Result ReportOpen access
Growth factors and cytokines have a great potential for regenerative medicine applications. Yet, most of these molecules have failed to show efficacy in humans or raised major safety concerns, due to high dosing and inappropriate delivery…
Negative / Null Result ReportOpen accessMedicine
Demattio L, Fietz D, Schuler G et al. · 2024 · Tierarztliche Praxis. Ausgabe G, Grosstiere/Nutztiere
A 9.4 mg deslorelin slow-release implant was inserted into an adult, healthy billy goat to achieve temporary infertility and a reduction in sexual behavior. The implant was inserted in late autumn. No significant change in testis size was…
View details →DOI: 10.1055/a-2289-5640 Negative / Null Result ReportOpen accessMedicine
Wang D, Nanavati C, Yang DZ et al. · 2026 · Journal of clinical pharmacology
Impact of concomitant medications (conmeds) on the safety of the investigational agent is often evaluated using subgroup analyses for safety events in patients who received the conmed versus those who did not. Here, we highlight the…
View details →DOI: 10.1002/jcph.70201 Negative / Null Result ReportOpen access
Marinus H. van IJzendoorn, Marian J. Bakermans-Kranenburg · 2009
AbstractIn middle childhood, boys show more avoidant attachments and girls more ambivalent attachments as a prelude to gender differentiation in reproductive strategies. However, we have failed to find systematic and method-independent…
View details →DOI: 10.1017/s0140525x0900003x Negative / Null Result ReportOpen access
Bjerknes, M. · 1986
Stochastic theories of stem cell renewal are shown to predict turnover of intestinal crypts. While I found ample evidence of production of new crypts from direct in vivo studies in adult mice, I failed to find evidence of crypt loss. Thus,…
View details →DOI: 10.1016/s0006-3495(86)83751-1 Negative / Null Result ReportMedicine
Choi, Gutman, Iglesia et al. · 2026 · Urogynecology (Philadelphia, Pa.)
Studies have shown that sexual function improves after surgical correction for stress urinary incontinence and pelvic organ prolapse. Current data suggest no significant difference in sexual function between transobturator and retropubic…
View details →DOI: 10.1097/spv.0000000000001888 Negative / Null Result ReportMedicine
Shaygantabar, Dianati, Ledari et al. · 2026 · BMC pediatrics
Exclusive enteral nutrition (EEN) induces remission in children with active mild to moderate Crohn's disease (CD), while partial enteral nutrition (PEN) with a free diet have failed to be effective in these patients. The effects of CD…
View details →DOI: 10.1186/s12887-026-07067-z Negative / Null Result ReportOpen accessMedicine
Caio Gonçalves de Souza, Márcio Passini Gonçalves de Souza, Vanda Jorgetti et al. · 2015 · Acta Ortopédica Brasileira
OBJECTIVE: To determine whether there is a difference on the bone architecture in patients with femoral neck fracture compared to patients with intertrochanteric fractures and assess the importance of aging on bone microarchitecture in patients with proximal femoral fracture.METHODS: Biopsy of the iliac crest was made in seventeen patients between 55 and 90 years old who were admitted to the emergency room with fractures of the proximal end of the femur. After a small fragment was removed, we made a histomorphometric analysis of it.RESULTS: There was no significant difference between patients
View details →DOI: 10.1590/1413-78522015230201056 Negative / Null Result ReportOpen accessGynecology and obstetrics
Toar A Kumaat, Maria F T Loho, Eddy Suparman · 2017 · Indonesian Journal of Obstetrics and Gynecology
Objective: To assess paramedic menopausal symptoms on the inpatient unit and outpatient unit. Methods: This was a cross sectional study. Data collect by fill the questioner, the questioner fill by menopausal paramedic on Prof. Dr. R. D. Kandou Manado Hospital from October 2016 to January 2017. Data were analyzed using SPSS 22.0 for Windows. Results: Of 60 paramedics, 30 were divided to inpatient unit and the other 30 were divided to outpatient unit. By the menopause rating scale, somatic and urogenital complaint in statistical test have no significant differences. Psychology complaint with a m
View details →DOI: 10.32771/inajog.v5i4.562 Negative / Null Result ReportOpen accessBiotechnology
Yu-Sin Jang, Hyeon Jeong Seong, Seong Woo Kwon et al. · 2021 · Frontiers in Bioengineering and Biotechnology
ATPase, a key enzyme involved in energy metabolism, has not yet been well studied in Clostridium acetobutylicum. Here, we knocked down the atpG gene encoding the ATPase gamma subunit in C. acetobutylicum ATCC 824 using a mobile group II intron system and analyzed the physiological characteristics of the atpG gene knockdown mutant, 824-2866KD. Properties investigated included cell growth, glucose consumption, production of major metabolites, and extracellular pH. Interestingly, in 2-L batch fermentations, 824-2866KD showed no significant difference in metabolite biosynthesis or cell growth comp
View details →DOI: 10.3389/fbioe.2021.754250 Negative / Null Result ReportOpen accessComputer Science
CLEO Collaboration, K. Edwards et al · 1997 · arXiv
We have searched for the decay of the tau lepton into seven charged particles and zero or one pi0. The data used in the search were collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR) and correspond to an integrated luminosity of 4.61 fb^(-1). No evidence for a signal is found. Assuming all the charged particles are pions, we set an upper limit on the branching fraction, B(tau- -> 4pi- 3pi+ (pi0) nu_tau) < 2.4 x 10^(-6) at the 90% confidence level. This limit represents a significant improvement over the previous limit.
Negative / Null Result ReportOpen accessAgriculture
Michaela Sediva, Kristyna Holcova, Lenka Pillerova et al. · 2017 · Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
Little is known about factors that influence owners’ decisions walking their dogs on or off a leash in public places. We examined the effect of the type of public place, dog’s age, sex and size, and human gender on off‑leash dog walking. Observations of 1850 dogs and their owners were made in streets and parks in Brno (Czech Republic). Multiple logistic regression analysis showed no significant effect of human gender on the frequency of unleashed dogs in streets and parks. Off‑leash dog walking was 2.8 times more likely in parks than in streets. Adult dogs were unleashed 1.9 times more likely
View details →DOI: 10.11118/actaun201765051761 Negative / Null Result ReportOpen accessAquaculture. Fisheries. Angling
Fu liang, Ming Li, Meiling Yu et al. · 2026 · Aquaculture Reports
Abstracts: This study investigated the effects of selenium-enriched Bacillus subtilis on the growth performance, antioxidant capacity, intestinal health, and metabolism of mandarin fish (Siniperca chuatsi) juveniles. The experiment included a control group (Y), a Bacillus subtilis group (BS), an inorganic selenium group (Se), and three groups with low, medium, and high concentrations of selenium-enriched B. subtilis (S1, S2, S3) in a 30-day feeding trial. The results showed that selenium-enriched B. subtilis had no significant effect on the final average body weight or specific growth rate of
View details →DOI: 10.1016/j.aqrep.2026.103652 Negative / Null Result ReportOpen accessTechnology
Joanna Kazimierowicz, Izabela Bartkowska, Maria Walery · 2020 · Energies
This study aimed to determine the effect of the low-temperature conditioning of excess dairy sewage sludge using solidified carbon dioxide on the efficiency of methane fermentation. An increase in the solidified carbon dioxide to excess dairy sewage sludge volumetric ratio above 0.3 had no significant effect on chemical oxygen demand concentration in the dissolved phase. The highest chemical oxygen demand values, ranging from 490.6 ± 12.9 to 510.5 ± 28.5 mg·dm −3 , were determined at solidified carbon dioxide to excess dairy sewage sludge ratio ranging from 0.3 to 0.5. The low-temperature cond
View details →DOI: 10.3390/en14010150 Negative / Null Result ReportOpen accessScience
Daulet Assanov, Aiymgul Kerimray, Birzhan Batkeyev et al. · 2021 · Aerosol and Air Quality Research
Abstract To slow the spread of COVID-19, the state of emergency was announced in Kazakhstan on March 16, 2020. Ust-Kamenogorsk instituted COVID-19 lockdown measures on April 2, 2020. The restrictions reduced the flow of traffic in the city but did not have a major impact on the large industries and power plants. In the areas with a complex profile of emission sources, traffic restriction measures alone may hardly tackle serious air pollution. This natural experiment allowed us to test how the reduction in transport movement affects air quality in Ust-Kamenogorsk, as there is a tendency to hold
View details →DOI: 10.4209/aaqr.200663 Negative / Null Result ReportOpen accessInfectious and parasitic diseases
Toussaint Rouamba, Esperance Ouédraogo, Houreratou Barry et al. · 2022 · International Journal of Infectious Diseases
Objectives: Our study aimed to assess the statistical relationship between the use of chloroquine phosphate or hydroxychloroquine plus azithromycin (CQ/HCQ + AZ) and virological recovery, disease worsening, and death among out- and inpatients with COVID-19 in Burkina Faso. Methods and Designs: This was a retrospective observational study that compared outcomes in terms of time to recovery, worsening, and death in patients who received CQ/HCQ + AZ and those who did not using a multivariable Cox or Poisson model before and after propensity matching. Results: Of the 863 patients included in the s
View details →DOI: 10.1016/j.ijid.2022.02.034 Negative / Null Result ReportOpen accessMedicine (General)
Amira Hamzaoui, Rim Klii, Olfa Harzallah et al. · 2014 · Acta Medica Iranica
To assess the association between polymorphisms of the IL-6 -174 G/C and Behçet's disease (BD) in Tunisian patients. DNA was extracted from blood samples taken from 43 Tunisian patients and 43 healthy controls. The polymorphisms were analyzed by PCR with the PCR-RFLP. No significant association was found between patients and controls concerning polymorphism of IL6 -174 G/C between the (allelic frequency: C (17.44 vs 8, 13%; P=0.17) et G (82,55 vs 91,86%; P= 0.21). Neither age of onset of BD nor sex appears to be influenced by allelic variation of SNP-174 G / C of IL6. Disease duration of BD wa
Negative / Null Result ReportOpen accessComputer Science
Yotam Elor, Hadar Averbuch-Elor · 2022 · arXiv
Balancing the data before training a classifier is a popular technique to address the challenges of imbalanced binary classification in tabular data. Balancing is commonly achieved by duplication of minority samples or by generation of synthetic minority samples. While it is well known that balancing affects each classifier differently, most prior empirical studies did not include strong state-of-the-art (SOTA) classifiers as baselines. In this work, we are interested in understanding whether balancing is beneficial, particularly in the context of SOTA classifiers. Thus, we conduct extensive e
Negative / Null Result ReportOpen accessMedicine
Richard R. Chapleau, CharLee A. Martin, Summer R. Hughes et al. · 2019 · BMC Research Notes
Abstract Objective This study sought to determine if there is an association between variants in the apolipoprotein E (ApoE) promoter regions and development of white matter hyperintensities (WMH) in military subjects who have been exposed to high altitude. In an earlier study, we found that ApoE status did not correlate with WMH development, and here we hypothesized that regulation of APOE protein expression may be protective. Results Our cohort of 92 subjects encountered altitude exposures above 25,000 feet mean sea level through their occupations as pilots or altitude chamber technicians. U
View details →DOI: 10.1186/s13104-019-4654-9 Negative / Null Result ReportOpen accessMicrobiology
Chih-Ching Yeh, Meei-Maan Wu, Chia-Min Wu et al. · 2021 · Viruses
Studies evaluating the association between age-related macular degeneration (AMD) risk and HCV infection are scant. In this population-based cohort study, 13,300 patients newly diagnosed as having HCV (HCV cohort) and 26,600 propensity score-matched patients without HCV (non-HCV cohort) were identified from the Taiwan National Health Insurance Research Database between 2000 and 2013. Furthermore, 1,983 patients with HCV who received pegylated interferon and ribavirin treatment (HCV-treated cohort) and propensity score-matched patients with HCV (matched at a ratio of 1:2) who did not receive th
View details →DOI: 10.3390/v13050790 Negative / Null Result ReportOpen accessMedicine
Kencono Viyati, Kinasih Prayuni, Yenni Zulhamidah et al. · 2023 · Makara Journal of Health Research
Background: Asthma is a multifactorial disease that encompasses a multitude of genetic and environmental factors. One such factor is the disintegrin and metalloprotein-33 (ADAM33) gene, which is correlated with asthma and bronchial hyperresponsiveness. Previous studies conducted on Asian populations have reported a significant association between rs2787094 polymorphism in the ADAM33 gene and asthma. Methods: Our study involved 153 Indonesian participants. TaqMan genotyping assay was used to analyze rs2787094 polymorphism in the ADAM33 gene. Results: No significant association was detected betw
View details →DOI: 10.7454/msk.v27i2.1431 Negative / Null Result ReportOpen accessMedicine
Seyed Mohammadreza Fatemi Khorasgani, Neda Ramezani, Negar Ebrahimi Varnousfaderani · 2020 · Journal of Research in Medical Sciences
Background: Previous studies report an association between joint hypermobility (JH), as a hallmark of connective tissue disorder, and autonomic dysfunction, digestive problems, and irritable bowel syndrome. However, its association with functional constipation (FC) has not been evaluated. This study is run and implemented to justify this theme/topic. Materials and Methods: In this case–control study among 200 subjects, 100 were of FC according to the ROME III Criteria (case group) and each child was matched for age and gender with a healthy control that did not meet criteria for FC (control gr
View details →DOI: 10.4103/jrms.jrms_881_19 Negative / Null Result ReportOpen accessPsychology
Monalisa Muniz, Ricardo Primi, Fabiano Koich Miguel · 2007 · Psicologia
The Emotional intelligence supposedly is a mediator variable in the stress control although there is no sufficient empirical evidence supporting this relationship. The purpose of the present research was to study the correlation between emotional intelligence and stress. The participants were 24 city guards who answered the Mayer-Salovey-Caruso Emotional Intelligence Tests V2.0 (MSCEIT) and the Lipp’s Inventory of Stress Symptoms for Adults (ISSL). The results showed no significant correlation between stress and the general score of emotional intelligence. However, analyzing the subtasks score