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Sample size: how many participants do I need in my research?

Overview of attention for article published in Anais Brasileiros de Dermatologia, July 2014
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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • Among the highest-scoring outputs from this source (#34 of 1,044)
  • High Attention Score compared to outputs of the same age (95th percentile)
  • High Attention Score compared to outputs of the same age and source (92nd percentile)

Mentioned by

news
2 news outlets
policy
1 policy source
twitter
16 X users

Citations

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112 Dimensions

Readers on

mendeley
959 Mendeley
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Title
Sample size: how many participants do I need in my research?
Published in
Anais Brasileiros de Dermatologia, July 2014
DOI 10.1590/abd1806-4841.20143705
Pubmed ID
Authors

Jeovany Martínez-Mesa, David Alejandro González-Chica, João Luiz Bastos, Renan Rangel Bonamigo, Rodrigo Pereira Duquia

Abstract

The importance of estimating sample sizes is rarely understood by researchers, when planning a study. This paper aims to highlight the centrality of sample size estimations in health research. Examples that help in understanding the basic concepts involved in their calculation are presented. The scenarios covered are based more on the epidemiological reasoning and less on mathematical formulae. Proper calculation of the number of participants in a study diminishes the likelihood of errors, which are often associated with adverse consequences in terms of economic, ethical and health aspects.

X Demographics

X Demographics

The data shown below were collected from the profiles of 16 X users who shared this research output. Click here to find out more about how the information was compiled.
As of 1 July 2024, you may notice a temporary increase in the numbers of X profiles with Unknown location. Click here to learn more.
Mendeley readers

Mendeley readers

The data shown below were compiled from readership statistics for 959 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
United Kingdom 1 <1%
Brazil 1 <1%
Unknown 957 100%

Demographic breakdown

Readers by professional status Count As %
Student > Master 141 15%
Student > Bachelor 133 14%
Student > Ph. D. Student 80 8%
Researcher 46 5%
Student > Doctoral Student 40 4%
Other 112 12%
Unknown 407 42%
Readers by discipline Count As %
Nursing and Health Professions 98 10%
Medicine and Dentistry 95 10%
Psychology 54 6%
Social Sciences 42 4%
Engineering 29 3%
Other 210 22%
Unknown 431 45%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 35. 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 15 June 2024.
All research outputs
#1,207,224
of 26,297,117 outputs
Outputs from Anais Brasileiros de Dermatologia
#34
of 1,044 outputs
Outputs of similar age
#11,305
of 243,366 outputs
Outputs of similar age from Anais Brasileiros de Dermatologia
#2
of 28 outputs
Altmetric has tracked 26,297,117 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 95th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 1,044 research outputs from this source. They typically receive more attention than average, with a mean Attention Score of 7.9. This one has done particularly well, scoring higher than 96% 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 243,366 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 95% of its contemporaries.
We're also able to compare this research output to 28 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 92% of its contemporaries.