Peyman Jafari

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The present study aimed to examine the psychometric properties of the Persian version of the 23-item PedsQL™ 4.0 Generic Core Scales in Iranian children with attention deficit hyperactivity disorder (ADHD). A clinical sample of seventy-two children aged 8–17 years with ADHD and their parents completed the questionnaire. The control group consisted of 140(More)
BACKGROUND The analysis of large-scale gene expression data is a fundamental approach to functional genomics and the identification of potential drug targets. Results derived from such studies cannot be trusted unless they are adequately designed and reported. The purpose of this study is to assess current practices on the reporting of experimental design(More)
OBJECTIVE The Cardiff Acne Disability Index (CADI) assesses the impact of acne on a patients life. The aim of the present study was to translate the CADI into Persian language and to validate the Persian version. METHODS Using standard forward-backward translation, 2 bilinguals translated the CADI into Persian language. We back translated it into English(More)
BACKGROUND The purpose of the study was to determine whether the Persian version of the KIDSCREEN-27 has the optimal number of response category to measure health-related quality of life (HRQoL) in children and adolescents. Moreover, we aimed to determine if all the items contributed adequately to their own domain. FINDINGS The Persian version of the(More)
BACKGROUND The aim of this study was to measure health related quality of life (HRQOL) in Iranian children with type 1 diabetes and to test the psychometric properties of the Persian version of the PedsQL™ 4.0 Generic Core Scales and the PedsQL™ 3.0 Diabetes Module. METHODS Participants were 94 children and adolescents diagnosed with type 1 diabetes for(More)
BACKGROUND The objective of this study was to translate and to test the reliability and validity of the 10-item Dermatology Life Quality Index (DLQI) questionnaire in Iranian patients with vitiligo. METHODS Using a standard "forward-backward" translation procedure, the English language version of the questionnaire was translated into Persian (the Iranian(More)
BACKGROUND Mood disorders in pregnancy and post-partum period are common and considered as a public health issue. Researchers have studied the relationship between low serum vitamin D concentration and perinatal depression, although no clinical trial has been conducted on vitamin D's effects on depression related to childbirth. This study evaluated the(More)
BACKGROUND Item response theory (IRT) is extensively used to develop adaptive instruments of health-related quality of life (HRQoL). However, each IRT model has its own function to estimate item and category parameters, and hence different results may be found using the same response categories with different IRT models. The present study used the Rasch(More)
BACKGROUND The practice of safety measures by the food service staff in hospitals is necessary for the prevention of food-borne outbreaks. Hospitalized patients are more vulnerable to potential hazards, and neglecting these principles can lead to increased morbidity and mortality. METHODS We assessed the knowledge, attitudes, and practices of food service(More)
BACKGROUND Mixed effects logistic models have become a popular method for analyzing multicenter clinical trials with binomial data. However, the statistical properties of these models for testing homogeneity of odds ratios under various conditions, such as within-center and among-centers inequality, are still unknown and not yet compared with those of(More)