نتایج جستجو برای: selected through multistage cluster sampling

تعداد نتایج: 1991190  

2012
Taha Ahmed Elmukashfi Omer Ali Ibrahim Isam Mohamed Elkhidir Abdelgadir Ali Bashir Mohammed Ali Awad Elkarim

BACKGROUND HBV is second to tobacco as a known human carcinogen and the 10th leading cause of death worldwide. OBJECTIVES To examine the socio-demographic characteristics of health care workers and hepatitis B virus in Public Teaching Hospitals in Khartoum State, Sudan, in 2004. METHODS It was an observational, cross sectional, facility-based study. A total of 843 subjects were selected. It...

2015
Mehdi Khabazkhoob Yadollah Mehrabi Abbasali Yekta

Purpose: Uncorrected visual acuity is the only variable measured in vision screening programs in many countries worldwide. The aim of this study was to calculate the sensitivity, specificity, and predictive value of the uncorrected visual acuity in the screening programs for the diagnosis of refractive errors. Methods: In this cross-sectional study, of 4,157 students in the first year of primar...

2015
Hassan Hashemi Mehdi Khabazkhoob Mohammad Hassan Emamian Mohammad Shariati Abbasali Yekta Akbar Fotouhi

PURPOSE To determine the normal distribution of corneal diameter in a 40- to 64-year-old population and its association with other biometric components. METHODS In a cross-sectional population-based study, subjects were selected through multistage cluster sampling from the 40- to 64-year-old citizens of Shahroud in northern Iran. After obtaining informed consents, optometry tests including re...

Journal: :Journal of psychiatric and mental health nursing 2011
M Narimani S Sadeghieh Ahari R Abdi

For any informed decision making about community-oriented nursing, it is necessary to map out the community regarding the psychological factors. This study is an attempt to estimate the mental disorders' rate among the age group of 15-65 in the urban areas of Ardabil province. A sample of 1430 individuals was selected through random multistage cluster sampling. The instruments employed in this ...

2016
Roya Kelishadi Fatemeh Rezaei Shirin Djalalinia Mojgan Asadi Sareh Miranzadeh Mohammad Esmaeil Motlagh Shirin Hasani Ranjbar Saeid Safiri Morteza Mansourian Mostafa Qorbani Omid Safari

Background: The association of duration of breastfeeding (BF) with weight disorders remains controversial. This study aimed to evaluate the association of BF with anthropometric measures and weight disorders in Iranian children and adolescents. Materials and Methods: Using multistage random cluster sampling method, a representative sample of 25,000 school students were selected from urban and r...

ژورنال: رویش روانشناسی 2020

This study examined the effectiveness of cognitive techniques of schema therapy  in reducing perfectionism in students. The research method was experimental with pretest- posttest and control group. The study population included all high school students in Qom city in 2014-2015 academic year. sampling method in this study was Multistage  random cluster. After the implementation of Tehran Multid...

2014
Alaa Badawi Suzan Sayegh Eman Sadoun Mohamed Al-Thani Paul Arora Pierre S Haddad

A recent relationship between vitamin D deficiency and the risk of type 2 diabetes mellitus (T2DM) and insulin resistance has been established through several studies. Research suggests a correlation between serum vitamin D and glycemic status measures. The aim of this study was to investigate the relationship between the plasma vitamin D levels (25[OH]D) and the factors linked to insulin resis...

Journal: :International journal of epidemiology 1997
J Katz S S Yoon K Brendel K P West

BACKGROUND The purpose of this study was to estimate the bias and design effects associated with the Expanded Program on Immunization's (EPI) sampling design when estimating xerophthalmia prevalence, and to estimate the savings associated with EPI in terms of distance travelled within selected clusters. METHODS Computer simulation of the EPI sampling strategy was done using maps from a xeroph...

2013
Mohamed Abouelenien Xiaohui Yuan Balathasan Giritharan Jianguo Liu Shoujiang Tang

We present a cluster-based sampling and ensemble method to learn from large, imbalanced data set for bleeding detection in CE videos. Our method selects training examples randomly according to the data distributions derived from clustering. Multiple training sets are created such that data balance is restored. The sampling probability is proportional to the cluster distribution, and within each...

Background: Mental disorder is one of the most important diseases of which is predicted to increase from 10.5% to 15% until 2020. This study aimed to determine economic factors influencing mental health using multiple regression models in Ilam province in 2013. Methods: In this cross sectional study, 903 families from different cities of Ilam were selected using multistage cluster sampling. ...

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