conclusions according to the results of this study, it seems that shift work can be considered a risk factor for high blood pressure changes. it is recommended that workers who are working in shifts are more at risk and need more supervision. background several factors affect the emergence of high blood pressure, among which include environmental and occupational factors. shift work is currentl...

background: the bipolar disorder patients follow-up (bdpf) project is a longitudinal, prospective and naturalistic study. the purpose of the present report is to introduce the project, elaborate its methods, and present the reliability data of the utilized symptoms rating scales. methods: the sampling started in may 2008 and is still in progress. the probands are assessed at the beginning of th...

in interventional or observational longitudinal studies, the issue of missing values is one of the main concepts that should be investigated. the researcher's main concerns are the impact of missing data on the final results of the study and the appropriate methods that missing values should be handled. regarding the role and the scale of the variable that missing values have been occurred and ...

original article   extended exposure to noise can cause permanent hearing damage. this study aimed to determine the incidence time of hearing loss and its effective factors in workers exposed to noise. this retrospective cohort study, was conducted on a total of 273 workers in various sectors of kerman copper by-industries co. their hearing status and the incidence of hearing loss (hearing thre...

background hepatitis b virus (hbv) is among the leading causes of liver cirrhosis worldwide. predictors of cirrhosis in iranian chronic hepatitis b (chb) patients are yet to be clearly identified. objectives evaluating the predictive factors of liver cirrhosis in chb. patients and methods a longitudinal study was conducted during 1995 - 2014 on all chb patients who were referred to tehran hepat...

BACKGROUND Selecting appropriate controls for studies of genetic variation in case series is important. The two major candidates involve the use of blood donors or a random sample of the population. METHODS We compare and contrast the two different populations of controls for studies of genetic variation using data from parents enrolled in the Avon Longitudinal Study of Parents and Children (...

BACKGROUND Cycle accidents are a common cause of physical injury in children and adolescents. Education is one strategy to reduce cycle-related injuries. In the UK, some children undertake National Cycle Proficiency Scheme [NCPS] training (now known as Bikeability) in their final years of primary school. It aims to promote cycling and safe cycling behaviours but there has been little scientific...

BACKGROUND Most previous studies on marital status and mortality did not adjust for the effect of 'marital selection'. Little research has been done about the relation between marital status and mortality in British women, with the exception of research on bereavement. METHODS Subjects consisted of women aged > or = 35 in a longitudinal study of a nationally representative sample. Marital sta...

background: obesity and overweight among children is a major public health problem in developed and developing countries and has important health and economic implications. this longitudinal study aimed to assessing the prevalence trend of overweight and obesity in west azerbaijan in north west of iran. methods: this study was a longitudinal follow-up study and was conducted in school children ...