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Changes in hospital mortality for United States intensive care unit admissions from 1988 to 2012

Overview of attention for article published in Critical Care, April 2013
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About this Attention Score

  • In the top 25% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (87th percentile)
  • High Attention Score compared to outputs of the same age and source (91st percentile)

Mentioned by

1 blog
6 tweeters


313 Dimensions

Readers on

300 Mendeley
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Changes in hospital mortality for United States intensive care unit admissions from 1988 to 2012
Published in
Critical Care, April 2013
DOI 10.1186/cc12695
Pubmed ID

Jack E Zimmerman, Andrew A Kramer, William A Knaus


INTRODUCTION: A decrease in disease-specific mortality over the last twenty years has been reported for patients admitted to United States (US) hospitals, but data for intensive care patients are lacking. The aim of this study was to describe changes in hospital mortality and case-mix using clinical data for patients admitted to multiple US ICUs over the last 24 years. METHODS: We carried out a retrospective time series analysis of hospital mortality using clinical data collected from 1988 to 2012. We also examined the impact of ICU admission diagnosis and other clinical characteristics on mortality over time. The potential impact of hospital discharge destination on mortality was also assessed using data from 2001 to 2012. RESULTS: For 482,601 ICU admissions there was a 35% relative decrease in mortality from 1988 to 2012 despite an increase in age and severity of illness. This decrease varied greatly by diagnosis. Mortality fell by >60% for patients with chronic obstructive pulmonary disease, seizures and surgery for aortic dissection and subarachnoid hemorrhage. Mortality fell by 51% to 59% for six diagnoses, 41% to 50% for seven diagnoses, and 10% to 40% for seven diagnoses. The decrease in mortality from 2001 to 2012 was accompanied by an increase in discharge to post-acute care facilities and a decrease in discharge to home. CONCLUSIONS: Hospital mortality for patients admitted to US ICUs has decreased significantly over the past two decades despite an increase in the severity of illness. Decreases in mortality were diagnosis specific and appear attributable to improvements in the quality of care, but changes in discharge destination and other confounders may also be responsible.

Twitter Demographics

The data shown below were collected from the profiles of 6 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 300 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
United States 2 <1%
Brazil 1 <1%
Netherlands 1 <1%
Iran, Islamic Republic of 1 <1%
Czechia 1 <1%
Unknown 294 98%

Demographic breakdown

Readers by professional status Count As %
Researcher 39 13%
Student > Ph. D. Student 33 11%
Student > Master 33 11%
Student > Bachelor 30 10%
Other 22 7%
Other 91 30%
Unknown 52 17%
Readers by discipline Count As %
Medicine and Dentistry 133 44%
Nursing and Health Professions 25 8%
Unspecified 16 5%
Engineering 9 3%
Biochemistry, Genetics and Molecular Biology 6 2%
Other 41 14%
Unknown 70 23%

Attention Score in Context

This research output has an Altmetric Attention Score of 11. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 13 February 2017.
All research outputs
of 22,877,793 outputs
Outputs from Critical Care
of 6,061 outputs
Outputs of similar age
of 194,367 outputs
Outputs of similar age from Critical Care
of 121 outputs
Altmetric has tracked 22,877,793 research outputs across all sources so far. Compared to these this one has done well and is in the 87th percentile: it's in the top 25% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 6,061 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 19.3. This one has gotten more attention than average, scoring higher than 61% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 194,367 tracked outputs that were published within six weeks on either side of this one in any source. This one has done well, scoring higher than 87% of its contemporaries.
We're also able to compare this research output to 121 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 91% of its contemporaries.