Background: Attention deficit hyperactivity disorder (ADHD) is among the most common neurodevelopmental disorders in children and adolescents. There is a controversy over the true prevalence of ADHD in Iran, the knowledge of which is crucial for allocating health care resources and identifying research priorities. This is an updated systematic review of the prevalence of ADHD in Iranian childre...

in this study, we aimed to conduct a meta-analysis on the results of eligible studies to estimate the prevalence of asthma, copd, and chronic bronchitis in iran. international and iranian databases including pubmed, scopus, web of science, iranmedex, and scientific information database (sid) were searched for population–based studies that had reported the prevalence of asthma and copd from 1990...

objective: the aim of the present study is to perform a systematic review of studies that have investigated the prevalence of sexual disorders in iran. method: a broad search was conducted in pubmed medline, isi web of science, psychinfo, cinahl, embase, and three iranian databases, including iranpsych, iranmedex, and scientific information database (sid). to cover those studies that were not p...

background recently there has been a significant increase in the number of systematic reviews addressing questions of prevalence. key features of a systematic review include the creation of an a priori protocol, clear inclusion criteria, a structured and systematic search process, critical appraisal of studies, and a formal process of data extraction followed by methods to synthesize, or combin...

objectives: bloating is a common and bothersome gastrointestinal symptom. despite its high prevalence, associated costs, and effects on the quality of life, very few studies have reported the epidemiology of bloating in iran. through this systematic review, findings and limitations of the current research will be discussed. methods: in march 2012, we searched pubmed, google scholar, scientific ...

PURPOSE In low prevalence settings, clinically active follicular trachoma (TF) is often found in the absence of detectable Chlamydia trachomatis. The reasons for this persistent follicular phenotype are not well understood; one possible explanation is that other bacterial species are provoking the inflammatory response. This study investigated the relationship between TF, C. trachomatis, and no...

introduction chronic hepatitis b virus (hbv) infection is one of the most important health problems worldwide with a high rate of morbidity and mortality. it is a major risk factor for cirrhosis and liver cancer. currently, iran is located in the intermediate hbv zone; however, recent studies have provided some evidence indicating an epidemiological change in the country. the aim of this study ...

background and purpose: sample size and its determination is one of the most important problems in health researches. calculating sample size for prevalence studies is one of the common questions of sample size topics. minimum sample size with least complexity is desirable in order to achieve the basic goal of these studies. this study aims to compare two formulas of sample size calculation for...