background: cancer registries are important infrastructure for cancer control programs. however most developing countries lack population based cancer registry. in iran there cancer incidence is estimated based on pathology-based cancer registry. in this study we evaluated results of the nationwide pathology-based cancer registry in iran. materials and methods: we compared age-standardized inci...

purpose : to determine the prevalence of ptosis and its correlation with vision-related variables in tehran population methods : through a stratified cluster random sampling, 160 clusters were selected proportional to the population of each municipal district of the city. all consented participants were transferred to the clinic and underwent thorough eye examination. here we report the prevale...

purpose: to describe the prevalence and risk factors of diabetic retinopathy (dr) in adults aged 40-80 years in yazd province in 2011. methods: this is a population-based survey on 2,320 urban and rural residents of yazd province. random multi-stage cluster sampling was employed in the survey. diagnosis of diabetes was made upon past medical history and drug history or insulin injection and in ...

conclusions the prevalence of astigmatism was high in children under six years old in this study, and to control amblyopia, it is necessary to consider astigmatism at younger ages. results the prevalence of refractive astigmatism of more than 0.5d in at least one eye was 51.4% (95% confidence interval (ci): 50.7-52.1); 52.1% in girls and 50.7% in boys (p = 0.412). prevalence of astigmatism decr...

background inflammatory bowel diseases (ibd) are debilitating diseases that lead to a variety of problems in a patient's daily life and are a huge burden for the health care system. since this group of diseases are multifactorial and complex, long-term longitudinal studies are clearly needed to understand them better. a population-based registry (ibd-far) has been established in fars, a souther...

The role of committed minorities in shaping public opinion has been recently addressed with the help of multiagent models. However, previous studies focused on homogeneous populations where zealots stand out only for their stubbornness. Here we consider the more general case in which individuals are characterized by different propensities to communicate. In particular, we correlate commitment w...

background: due to the marked increase in the burden of cancer both in the developed and developing countries, world health organization recommends planning and implementation of comprehensive cancer control program in all countries. we evaluated evolutionary progress of the population based cancer registries (pbcr), an essential component of the cancer control program. methods: we studied freq...

In this paper we present an agent-based model of the dynamics of mortality, fertility, and partnership formation in a closed population. One of our goals is to bridge the methodological and conceptual gaps that remain between demography and agent-based social simulation approaches. Model construction incorporates elements of both perspectives, with demography contributing empirical data on popu...