background: several environmental and psychosocial risk factors are known for adolescent smoking as the single cause of preventable diseases and premature death. this cross-sectional study aimed to determine the prevalence of cigarette smoking, socio-demographic factors associated with cigarette smoking (age, education level, parents’ job, and family’s socioeconomic statues), and the role of fa...

background: venous diseases including varicose veins and chronic venous insufficiency are one of the most important pathogenic factors worldwide. high prevalence of varicose veins and its complications is an emerging problem in the twenty-first century. this study aimed to determine the prevalence and associated risk factors of varicose veins in female hairdressers in shahroud, north of iran in...

purpose: to determine the incidence of retinopathy of prematurity (rop) and to evaluate the possible neonatal risk factors for rop among premature infants referred to farabi eye hospital during 2000-2002. methods: newborn infants with gestational age (ga) £ 37 wk or birth weight (bw) £ 2500 g were included. the first eye examination was performed 4-9 weeks after birth. data on possible risk fac...

background: the present study was designed to determine the risk factors that lead to bango abuse among secondary school student and drivers in assiut province. subjects and method: urine samples were taken from 1000 volunteers after filling a questionnaire, 500 students from different secondary schools and 500 drivers in assiut province. the risk factors that lead to bango abuse among drivers ...

The present study aims at investigating the relationship between firm specific risk and stock return using cross-sectional quantile regression. In order to study the power of firm specific risk in explaining cross-sectional return, a combination of Fama-Macbeth (1973) model and quantile regression is used. To this aim, a sample of 270 firms listed in Tehran Stock Exchange during 1999-2010 was i...

this is a cross-sectional study aiming at analyzing the relation between falling and domestic environmental -risk factors in community-dwelling elderly.the study consisted of 243 randomly chosen community-dwelling elderly over 65 years of age living around a health care center in central selcuklu, konya. data were collected with a questionnaire form including socio-demographic and other charact...

objective assessment of risk predictors for adverse neurodevelopmental outcome at 1 year of age in term and near-term infants. material & methods this case-control study was a representative sample of infants from different health-care centers of north and east of tehran. the association between risk factors and delayed motor development (developmental quotient below 70 indicating a significant...

background: life style is an important element to prevent the cancer. therefore, this study aimed to determine life style risk factors of tehran citizens as well as to prevent cancer. methods: this study is a descriptive - analytic research with sample size of 2500 tehran citizens. the study data was collected via a questionnaire that contained 2 parts: demographic and questions related to life...