OBJECTIVE Indicators of reproducibility for log-transformed variables can often not be calculated straightforwardly and are subsequently incorrectly interpreted. METHODS AND RESULTS We discuss meaningful Coefficients of Variation (CV) for log-transformed variables, which can be derived directly from the standard error of the log-transformed measurements. To provide easy interpretable Bland an...

Purpose: To compare the Central Corneal Thickness (CCT) measurements obtained by Ultrasound Pachymeter (USP) & Ultrasound Biomicroscope (UBM). Methods: The study CCT measurements of 60 eyes was measured using first with UBM followed by USP. Results were compared statistically using Bland –Altman plots & Deming’s regression analysis Results: Scatter plot analysis showed that for the same value o...

Fig. 1 (a) MRE wave image and Elastogram (b) UTE spatio-temporal strain map (c) Bland-Altman plot MRE: FOV=14cm,Matrix=256X64,TR/TE=50/26.5ms, flip angle=30 ̊, thickness=10cm, BW=±16kHz, continues vibration=60Hz, average stiffness of ROI drawn on the elastogram was measured as the stiffness of the phantom. UTE: center frequency of transducer=3.5 MHz, transient vibration=20ms (1 cycle of 50 Hz si...

OBJECTIVES To compare the SjO2 (cerebral oxygenation indicator) and SvO2 (cardiac output indicator) during pediatric cardiac surgery with cardiopulmonary bypass (CPB). METHODS Retrospective study. Data of SjO2 and SvO2 measured simultaneously at critical time periods during cardiac surgery with CPB were analyzed by the Spearman correlation test and Bland- Altman plot. RESULTS Regression ana...

Purpose of Review Cardiac output monitors can be assessed by a variety of techniques, but a common principle is quantifying agreement between a reference standard and new monitor. The current standard analysis technique is a Bland-Altman plot. The Bland-Altman plot evaluates bias between mean differences of cardiac output, from which an agreement interval is derived. These limits are, however, ...

Over the last few years, miRNA microarray platforms have provided great insights into the biological mechanisms underlying the onset and development of several diseases. However, only a few studies have evaluated the concordance between different microarray platforms using methods that took into account measurement error in the data. In this work, we propose the use of a modified version of the...

Montero et al. do report the 95% limits on the Bland-Altman plot, perhaps the authors could have reported the 95% limits of agreement for a specific number of thresholds of proteinuria for example <300mg, <3.5 grams or >3.5 grams individually which would be useful for clini-cians trying to interpret spot urine pro-tein/creatinine ratio. I worry that readers of this excellent study may be left f...

Bland-Altman’s analysis and plot are the most common methods used to assess the relative agreement between two analytical methods that measure the continuous variables measured on the same scale. Many agreement studies have shown that using the t-test or the Pearson’s product-moment correlation is flawed when measuring the agreement or detecting the bias. Bland-Altman proposed graphical techniq...

Letters to the Editor will be published, if suitable, as space permits. They should not exceed 1000 words (typed double-spaced) in length and may be subject to editing or abridgment. Rossi et al recently concluded that the aldosterone:renin ratio (ARR) is reproducible. 1 However, we think that several common errors were performed in their data interpretation, as described below. In the Bland-Al...