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A z score (or standardized value) is measured in units of the standard deviation. It tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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Introduction to z Scores01:05

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A z score (or standardized value) is measured in units of the standard deviation. It indicates how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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z scores are the standardized values obtained after converting a normal distribution into a standard normal distribution. A z score is measured in units of the standard deviation. The z score tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a z score of...
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The z score is one of the three measures of relative standing. It describes the location of a value in a dataset relative to the mean. z scores are obtained after the standardization of the values in a dataset. The z score for the mean is 0.
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An experiment is a planned activity carried out under controlled conditions. The purpose of an experiment is to investigate the relationship between two variables. When one variable causes change in another, we call the first variable the explanatory or independent variable. The affected variable is called the response or dependent variable. In a randomized experiment, the researcher manipulates values of the explanatory variable and measures the resulting changes in the response variable. The...
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Use of a Video Scoring Anchor for Rapid Serial Assessment of Social Communication in Toddlers
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Lung Allocation Score System: First Italian Experience.

A Palleschi1, E Benazzi2, C F Rossi1

  • 1Thoracic Surgery and Lung Transplantation Unit, Ca' Granda Foundation Ospedale Maggiore Policlinico, Milan, Italy.

Transplantation Proceedings
|February 10, 2019
PubMed
Summary
This summary is machine-generated.

The Lung Allocation Score (LAS) improved lung transplant waiting times and increased transplant rates in Italy. This system shows encouraging short-term outcomes without adverse effects, warranting further study.

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Area of Science:

  • Cardiology
  • Transplantation Medicine
  • Pulmonary Medicine

Background:

  • Lung transplantation is a vital treatment for end-stage pulmonary disease.
  • The Lung Allocation Score (LAS) was implemented in the U.S. in 2005 to optimize recipient benefits and reduce mortality.
  • LAS has been provisionally used in an Italian region since March 2016.

Purpose of the Study:

  • To analyze waiting list dynamics and short-term outcomes following lung transplantation.
  • To compare patient data before and after the implementation of the LAS system.

Main Methods:

  • A retrospective study included patients who underwent lung transplantation between January 1, 2011, and March 15, 2017.
  • Patients were categorized into historical and post-LAS cohorts for comparative analysis of perioperative data.

Main Results:

  • The post-LAS cohort showed a decrease in median waiting time (223 to 106 days) and waiting list mortality (11.2% to 7.5%).
  • Lung transplantation rates increased significantly (25% to 38%), as did the probability of receiving a transplant within the first year post-LAS implementation.

Conclusions:

  • The introduction of the LAS system in the region yielded positive short-term results.
  • No adverse short-term effects were observed, supporting the continuation of LAS for medium-term outcome evaluation.