Objective: Measurement of glomerular filtration rate (GFR) is the best determinant in assessment of kidney function for diagnostic and therapeutic purposes. As extremely accurate methods of GFR measurement (i.e. Inulin clearance) are expensive and Time-consuming and due to limitations of the 24 hour urine collection method, some formula have been developed for the GFR measurement. Here we have ...

BACKGROUND In the field of vertical jump diagnostics, force plates (FP) are the reference standard. Recently, despite a lack of evidence, jump mats have been used increasingly. Important factors in favor of jumping mats are their low cost and portability. OBJECTIVES This validity study compared the Haynl-Elektronik jump mat (HE jump mat) with the reference standard force plate. MATERIALS AN...

BACKGROUND Quantitative measurement procedures need to be accurate and precise to justify their clinical use. Precision reflects deviation of groups of measurement from another, often expressed as proportions of agreement, standard errors of measurement, coefficients of variation, or the Bland-Altman plot. We suggest variance component analysis (VCA) to estimate the influence of errors due to s...

Introduction: The aim of this study was to determine the accuracy of digital panoramic radiography in estimating the crestal width of implant fixtures after surgery. Materials and Methods:We selected 241 digital panoramic images after implant insertion which had documented information of their actual size. The crestal width was measured on radiographs. We compared two measuring methods in diff...

Abstract Objectives The creamatocrit is a simple technique for estimating the lipid content of milk, widely adopted clinical and research purposes. We evaluated effect long-term cryogenic storage on human milk. Methods Frozen thawed milk specimens ( n = 18) were subjected to technique. reanalyzed after (10 years at <70°C). correlation between pre- post-storage values was tested, their differ...

When developing a new method to measure the concentration or the quantity of an element (molecule, micro organism, ...) you might want to check whether it gives results that are similar to a reference or comparative method or not. If there is a difference, you might be interested in knowing if this is due to a bias that depends on where you are on the scale variation. If a new measurement metho...

We cross validated the 20-m shuttle run test of aerobic capacity in children and adolescents with mild and moderate mental retardation @lR) using the population specific formula of Femhall et al. (1998). Nine boys and 8 girls (age = 13.7 yr) completed a maximal treadmill protocol (measured .\iOtFk) and a 20-m shuttle run (predicted ~ 0 , ~ ~ ) . The measured peak oxygen consumption ( ~ 0 ~ ~ ) ...

EDITOR: We read the article by Dr Bajorat and colleagues reporting their results with different methods of cardiac output (CO) determination with great interest [1]. The authors should be commended for this study having for the first time compared a broad array of clinically used methods of CO determination to a true reference standard, i.e. aortic transit time ultrasound. However, though their...

I read with interest the paper by FANFULLA et al. [1] on half-night polysomnography (HN-PSG). The authors found that there was a significant difference between apnoeahypopnoea indices (AHIs) recorded in the first and second portion of a standardized full-night polysomnography (FN-PSG). The statistical difference was more significant in patients who did not have rapid eye movement (REM) sleep du...

OBJECTIVE To verify whether parents and health professionals homogeneously evaluate presence and intensity of neonatal pain. METHODS This cross-sectional study enrolled 52 neonates and 154 adults. Inclusion criteria for neonates were admission to neonatal intensive care unit, presence of gastric tube, tracheal tube, and venous lines. Each newborn was observed by a different group of three adu...