قاسمی, عرفان
آمار زیستی گروه آمار زیستی، دانشکده پیراپزشکی دانشگاه علوم پزشکی شهید بهشتی، تهران، ایران
[ 1 ] - چند رویکرد برخورد با مقادیر گمشده متغیرهای کمی و بررسی اثر آنها بر نتایج حاصل از یک کارآزمایی بالینی
Background and Objectives: A major challenge that affects the longitudinal studies is the problem of missing data. Missing in the data may result in the loss of part of the information which reduces the accuracy of the estimator and obtain the results will be biased and inaccurate. Therefore, it is necessary to evaluate the missing data mechanism from a longitudinal research and to consider thi...
[ 2 ] - Bayesian Zero- Inflated Poisson model for prognosis of demographic factors associated with using crystal meth in Tehran population
Background: Use of methamphetamine (MA) and other stimulants has increased steadily over the past 10 years. Risk factor evaluation to reduce the problem in the community is one solution to protect people from addiction. This study aimed at using Bayesian zero- inflated Poisson (ZIP) model to investigate the relationship between the number of using crystal meth and some demogr...
[ 3 ] - مقایسه زمان شروع فعالیت عضلات شکم در دو سمت تنه هنگام خم کردن اندام زبرین در افراد سالم : مطالعه‌ای درباره‌ی پاسخ‌های وضعیتی تنه
مقدمه و اهداف هدف از این مطالعه بررسی زمان شروع فعالیت عضلات شکم در مقایسه با زمان شروع فعالیت عضله دلتویید اندام بالاتنه غالب هنگام پاسخ‌های وضعیتی پیش بینانه در افراد سالم می باشد. مواد و روش ها در این مطالعه‌ی مشاهده‌ای، 20 نفر خانم (با میانگین سنی25/3سال و22/36kg/m²BMI =) مورد بررسی قرار گرفتند . هنگام انجام حرکت خم کردن سریع شانه‌ی اندام غالب در وضعیت ایستاده ، داده های الکترومیوگرافی عضله...
[ 4 ] - The Effect of Flixweed-Honey Vaginal Product on Cervicitis: a Clinical Trial
Background and objectives: Cervicitis is a common and recurrent gynecologic disease which is usually resistant to treatments. This study was conducted to investigate the effect of Iranian traditional medicine (ITM) product, flixweed- honey, on cervicitis. Methods: A quasi-experimental study was conducted as a clinical trial before and after the intervention at ...
[ 5 ] - Predictor Factors of Breastfeeding Attitude in Iranian Breastfeeding Mothers: A Cross-Sectional Study
Background: Breastfeeding is an ideal nutritional method that has many benefits for mothers, infants and the health system.Negative attitude toward breastfeeding is accompanied with unpleasant consequences. We aimed to determine the predictors of breastfeeding attitude in Iranian breastfeeding mothers. Materials and Methods: This descriptive-analytical and cross-sectional study was conducted on...
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