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Related Concept Videos

What is Variation?01:14

What is Variation?

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Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
The range, standard deviation, standard error, and variance are the different measures of variation.
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Conservative Site-specific Recombination and Phase Variation02:53

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Variation01:19

Variation

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An important characteristic of any set of data is the variation in the data. In some data sets, the data values are concentrated closely near the mean; in other data sets, the data values are more widely spread out from the mean. The most common measure of variation, or spread, is the standard deviation, which is the square root of variance.
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Variation of Atmospheric Pressure01:18

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Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
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Comparing Copy Number Variations and SNPs02:26

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Protein Complexes with Interchangeable Parts01:57

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Endoscopic Cholesteatoma Surgery
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Variation in postacute care utilization after complex surgery.

Courtney J Balentine1, Meredith C Mason2, Peter J Richardson3

  • 1Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama; Institute for Cancer Outcomes & Survivorship, University of Alabama at Birmingham, Birmingham, Alabama.

The Journal of Surgical Research
|August 14, 2018
PubMed
Summary
This summary is machine-generated.

Hospital discharge rates to postacute care (PAC) vary significantly after major surgery. Understanding health system factors influencing PAC use is crucial for reducing this variation.

Keywords:
Postacute carePostoperative recoveryVariation

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Area of Science:

  • Health Services Research
  • Surgical Outcomes
  • Healthcare Policy

Background:

  • Postacute care (PAC) utilization drives significant regional variation in Medicare spending.
  • Previous studies on hospital PAC variation focused on non-surgical patients or limited datasets.
  • Nationally representative data on postoperative PAC discharge variation between hospitals is lacking.

Purpose of the Study:

  • To investigate hospital-level variations in postacute care utilization following cardiovascular and abdominal surgery.
  • To provide a national perspective on discharge patterns to skilled nursing facilities and inpatient rehabilitation.

Main Methods:

  • Analysis of 3,487,365 non-veteran and 60,666 veteran patients undergoing major surgeries (colorectal, hepatectomy, pancreatectomy, coronary bypass, aortic repair, vascular bypass) from 2008-2011.
  • Calculation of unadjusted and risk-adjusted observed-to-expected ratios for PAC discharge at the hospital level.
  • Inclusion of data from the Nationwide Inpatient Sample and Veterans Affairs health system.

Main Results:

  • 18% of non-veterans and 8% of veterans were discharged to PAC facilities.
  • Hospital discharge rates to PAC varied widely: 1%-36% for veteran hospitals and 1%-59% for non-veteran hospitals.
  • Risk-adjusted ratios indicated substantial hospital-level variation in PAC utilization.

Conclusions:

  • Significant variation exists in postacute care utilization and home discharge rates after major abdominal and cardiovascular surgeries.
  • Further research is necessary to identify health system factors contributing to PAC utilization variability.
  • Addressing these variations may lead to more standardized and potentially cost-effective patient care pathways.