نتایج جستجو برای: longitudinal re
تعداد نتایج: 300747 فیلتر نتایج به سال:
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 ...
background: the aim of this study was to estimate the conversion rate from radiologically isolated syndrome (ris) to definite multiple sclerosis (ms). methods: during a mean (standard deviation [sd]) follow-up period of 17.4 (5.4) (range 8-29) months, 25 subjects with ris and without neurological symptom aged 22-45 year from a single-center have been examined for the occurrence of definite ms. ...
background: adolescent tobacco use remains a major public health priority to reduce the prevalence of tobacco use in community. the aim of this study was determining the association of the transitions in smoking stages with prevalence of cigarette smoking in the classes and schools in adolescents of tabriz city (northwest of iran). methods: fifty-six high schools were randomly selected, and 490...
background physical activity (pa) patterns during pregnancy have not been explored in depth and most previous studies lack assessment of variables such as type, frequency, duration and intensity of activity. objectives this study had two goals: 1) to analyze pa patterns during pregnancy according to weekly time spent on different types of activity; and 2) to determine women’s perception about h...
methodsusing time series data of national level (1967 to 2012 years), we explored the association between total fertility rate, gdp per capita, number of physician per 1000 populations, female labor force participation rate, percentage of people living in rural regions and mean years schooling for each people with infant mortality rate of iran. these data were obtained from central bank of isla...
longitudinal study plays an important role in the epidemiological, clinical, and social science studies. in these kinds of studies, every individual is observed frequently during a period of time. the statistical analysis of longitudinal presents special opportunities and challenges. the repeated outcomes for one individual tend to be correlated among themselves also one of the pro...
BACKGROUND A lack of advanced healthcare information systems and validated scientific cohorts in Nicaragua makes it difficult to estimate disease prevalences and other public health statistics. Although there is concern of an "epidemic" of chronic kidney disease (CKD) in this country, statistics regarding its magnitude are derived from only a small number of non-representative studies. Budgetar...
This paper deals with the design of robust Fault Detection and Isolation (FDI) filters for atmospheric re-entry vehicles subjected to actuator faults. The FDI technique is based on carefully chosen linear models of the controlled vehicle about the available on-board reference trajectories. The modelling process allows for both Lateral/directional and longitudinal motions. Design trade-offs are ...
in many area of medical research, a relation analysis between one response variable and some explanatory variables is desirable. regression is the most common tool in this situation. if we have some assumptions for such normality for response variable, we could use it. in this paper we propose a nonparametric regression that does not have normality assumption for response variable and we focus ...
background: the present study was performed to develop a scoring system for predicting cure status in patients with cutaneous leishmaniasis (cl). materials and methods: this study included 199 patients with cl from skin diseases and leishmaniasis research center (isfahan, iran). data were collected as longitudinal in each visit of patients. we applied ordinal logistic generalized estimating equ...
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