نتایج جستجو برای: selected through multistage cluster sampling

تعداد نتایج: 1991190  

Journal: :Ophthalmic epidemiology 2006
Mengiste M Mesfin Julio de la Camera Israel G Tareke G Amanual T Araya Abbi M Kedir

AIM Trachoma is a public health problem in Ethiopia accounting for 35-50% of cases of blindness. This study aims to determine the prevalence of trachoma in Tigray and to evaluate whether common risk factors are also risk factors in this region. METHOD A cross sectional community-based survey was conducted. From six districts, a total of 48 villages were selected by a multistage cluster random...

2017
Palida Abulizi Xiao-Hui Zhou Kabinuer Keyimu Mei Luo Feng-Qing Jin

The secretive Klotho protein is an anti-aging regulatory hormone that plays a physiological role in many target organs. The present study aims to investigate the correlation between Klotho gene and mild cognitive impairment (MCI) in Uygur and Han populations in Xinjiang. From July 2008 to April 2014, stratified random multistage cluster sampling was used in combination with the methods of on-si...

Journal: :Endokrynologia Polska 2008
Fatemeh Jafary Ashraf Aminorroaya Massoud Amini Atoosa Adibi Mehri Sirous Ehsan Roohi Mohsen Mostafavi

INTRODUCTION Thyroid nodules not detected in palpation but diagnosed following a radiological procedure or during surgery are called thyroid incidentalomas. We designed this study to investigate the prevalence of sonographic thyroid incidentaloma in Isfahan, Iran, for the first time. MATERIAL AND METHODS By a multistage cluster sampling method, 2523 adults were selected randomly. From this gr...

پایان نامه :0 1374

the present study investigated the effect of the two vocabulary teaching techniques in est, namely the use of translation and the use of visual aids as two separate vocabulary teaching techniques. to answer the question of the study, a pretest (michigan test) was administered to the 58 randomly selected est students at khajeh nasiredin tusi university, faculty of mechanics. after the homogeneit...

Introduction: Prevention of academic failure and subsequent improvement of educational quality and academic achievement of students are important in considering the variables related to academic achievement. One of the psychological characteristics that affects the academic achievement of the learners is procrastination. Educational neglect is affected by several factors. In this study, the stu...

2002
Barry I. Graubard Edward L. Korn

1. INTRODUCTION k-L-p+l. Thus, the Wald statistic X W =-01V-10 can have very low power (Korn Complex surveys usually involve and Graubard 1990). multistage cluster sampling where the selection of primary sampling units (PSU's) is within Alternative test procedures the Wald well-defined strata at the first stage of sampling, test, along with their asymptotic properties, are The standard error of...

2011
Antonio Bernabe-Ortiz Cesar P. Carcamo John D. Scott James P. Hughes Patricia J. Garcia King K. Holmes

BACKGROUND Data on hepatitis B virus (HBV) prevalence are limited in developing countries. There is also limited information of consistent condom use efficacy for reducing HBV transmission at the population level. The study goal was to evaluate the prevalence and factors associated with HBV infection in Peru, and the relationship between anti-HBc positivity and consistent condom use. METHODS ...

Journal: :روانپزشکی و روانشناسی بالینی ایران 0
محمد حسن گرجی زاده mohamad hasan gorjizadeh ., keyan pars, ahwaz, iran, i. rاهواز، کیان‏پارس فلکه سوم،خیابان سوم غربی، پلاک 70. بهنام مکوندی behnam macvandi اهوازکمپلو، خیابان‏لشکر،خیابان اعتصامی، پلاک 1/44.

the aim of this study was to determine the prevalence of depression, anxiety and phobia during pregnancy in ahwaz. for this purpose, 360 pregnant and 60 nonpregnant women, who were referred to the public hospitals and private out-patient clinics were selected through cluster sampling. all of the subjects completed the minnesota multiphasic personality inventory (mmpi). data were analyzed by des...

2016
Vicente J. Llorent Rosario Ortega-Ruiz Izabela Zych

Inclusion in education of all the children is necessary for the success, equality and peace among individuals and societies. In this context, special attention needs to be paid to the minorities. These groups might encounter additional difficulties which make them more vulnerable to be involved in bullying and cyberbullying. The current study was conducted with the objective of describing the i...

2002
Hongjian Yu

are extensively used in analyzing sample survey data to study the relationship between a binary response and a group of independent variables. Due to cost and efficiency considerations, stratified multistage samples are the norm. However, these samples, while efficient for estimation of the descriptive population quantities, pose challenges for model-based statistical inference. This sampling s...

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