background: serologic screening of gastric cancer (gc) by serum pepsinogens (spg) levels and helicobacter pylori (hp) sero-status, though highly informative, has provided heterogeneous results. here, we have evaluated the modifying effects of demographic factors on the risk impact of hp sero-status/spg levels in gastric cancer, with particular emphasis on age. methods: a cross-sectional study w...

BACKGROUND Gender distribution of acute stroke patients varies considerably among stroke registries throughout the world, but factors responsible for this phenomenon remained vastly unknown. MATERIALS AND METHODS Using data from prospective hospital-based stroke registries in China (n = 752 acute stroke patients), Germany (n = 96054), India (n = 1500), and Iran (n = 1392), this descriptive st...

this article, first, examined the role of efl university students' critical thinking (ct) in their self-efficacy beliefs. second, the role of gender as a moderating factor in the relationship between students' ct and self-efficacy beliefs was investigated. third, the difference between females and males regarding their ct and efficacy beliefs was studied. to attain the goals of the research, 86...

with regard to the impossibility of preparing learners for each situation that they might encounter in their life, it is more logical to teach them how to cope with unexpected challenges. helping learners ‘learn how to help themselves’ can be facilitated by means of tasks and activities in the classroom context. this paper presents some of the find- ings of a study on iranian young learners bet...

objective: the lack of adequate recognition of health importance of non-hiv reproductive health infections (rhis) in nigeria has led into this study, which was to determine clinical pathogens in non-hiv rhi in nigeria using a tertiary health facility as case study. materials and methods: a nine-year investigation was carried out between 1997 and 2005 on 4047 (n = 1626 males; n = 2421 females) p...

Little is known about past and present mortality in Vietnam, as the first official data on mortality have only recently become available from censuses taken in 1979 and 1989. Using these data, I estimate Vietnamese mortality during the intercensal period using two techniques that rely on age-specific growth rates from two successive age distributions. Intercensal emigration and differential com...

OBJECTIVE The aim of the study was to establish the contemporary epidemiological characteristics of Japanese encephalitis (JE) in Guizhou Province. METHODS A retrospective study of National Notifiable Disease Reporting System (NNDRS) data from 1971 through 2009, was conducted to ascertain the geographical, seasonal, and age distributions of JE incidence in Guizhou Province, China. RESULTS A...

The food consumption to biomass ratio (C) is one of the most important population parameters in ecosystem modelling because its quantifies the interactions between predator and prey. Existing models for estimating C in fish populations are per-recruit cohort models or empirical models, valid only for stationary populations. Moreover, empirical models lack theoretical support. Here we develop a ...

The following article is the verbatim text of a report based on research funded by the Social Security Administration and the National Institute of Child Health and Human Development to the Rand Corporation. The report looks at changing fertility rates in the United States and their implications for future population size and age distributions. An economic model of fertility rate is used to exp...