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...

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...

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...

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...

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 ...

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...

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...

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...