Results 11 to 20 of about 3,026,493 (306)
Air pollution and emergency department visits for conjunctivitis: A case-crossover study [PDF]
International Journal of Occupational Medicine and Environmental Health, 2016 Objectives: The purpose of this study was to examine the associations between emergency department (ED) visits for conjunctivitis and ambient air pollution levels in urban regions across the province of Ontario, Canada.
Mieczysław Szyszkowicz +2 more
doaj +2 more sources
环境与职业医学, 2022 BackgroundUnder the background of global climate change, temperature has increased dramatically. Most studies about association between temperature and human health are conducted in low-altitude areas, but rarely focus on plateau areas.ObjectiveTo ...
Guoxia BAI +9 more
doaj +1 more source
Extraction bradycardia: a pilot case-crossover study [PDF]
Head & Face Medicine, 2013 Abstract Purpose Significant vasovagal reaction is one of the untoward events in the course of simple extractions. The present study then aimed to record the patients’ heart rate during the extraction procedure. Materials and methods Informed consents were obtained in ...
Rashad, Ashkan +3 more
openaire +2 more sources
Selecting appropriate study designs to address specific research questions in occupational epidemiology. [PDF]
, 2007 UNLABELLED: Various epidemiological study designs are available to investigate illness and injury risks related to workplace exposures. The choice of study design to address a particular research question will be guided by the nature of the health ...
Pearce, Neil +2 more
core +1 more source
Respiratory Research, 2021 Background Positive associations between ambient PM2.5 and cardiorespiratory disease have been well demonstrated during the past decade. However, few studies have examined the adverse effects of PM2.5 based on an entire population of a megalopolis.
Zhan Ren +9 more
doaj +1 more source
Antibiotics and oral contraceptive failure — a case-crossover study [PDF]
Contraception, 2011 Evidence on the association between antibiotic use and combined oral contraceptive (COC) failure is controversial. We examined the effect of concomitant antibiotic treatment on the risk of breakthrough pregnancy among COC users.We performed a case-crossover study of 1330 COC failure cases among 17,721 women from the Slone Epidemiology Center Birth ...
Toh, Sengwee +4 more
openaire +3 more sources
Embedded experts in online collaborative learning: a case study [PDF]
, 2021 The affordance of online communication and collaboration technology provides a forum for preservice teachers, practicing teachers, and teacher educators to engage in authentic discourse where multiple perspectives can be shared.
Lock, Jennifer, Redmond, Petrea
core +1 more source
EBioMedicine, 2023 Summary: Background: It remains unknown how ambient temperature impact pneumonia of various infectious causes. Methods: Based on the national death registry covering all counties in Chinese mainland, we conducted an individual-level case-crossover study
Qinglin He +7 more
doaj +1 more source
Environmental Health, 2023 Background Satellite-based PM2.5 predictions are being used to advance exposure science and air-pollution epidemiology in developed countries; including emerging evidence about the impacts of PM2.5 on acute health outcomes beyond the cardiovascular and ...
Iván Gutiérrez-Avila +6 more
doaj +1 more source
Persistent User Bias in Case-Crossover Studies in Pharmacoepidemiology [PDF]
American Journal of Epidemiology, 2016 Studying the effect of chronic medication exposure by means of a case-crossover design may result in an upward-biased odds ratio. In this study, our aim was to assess the occurrence of this bias and to evaluate whether it is remedied by including a control group (the case-time-control design).
Hallas, Jesper +4 more
openaire +2 more sources