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Bias in Epidemiological Studies01:29

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Biases can arise at various stages of research, from study design and data collection to analysis and interpretation. Recognizing and addressing these biases is essential to ensure the validity and reliability of epidemiological findings.Broadly speaking, biases in epidemiology fall into three main categories: selection bias, information bias, and confounding. A more detailed description of possible biases is:  
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Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
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Confounding in statistical epidemiology represents a pivotal challenge, referring to the distortion in the perceived relationship between an exposure and an outcome due to the presence of a third variable, known as a confounder. This variable is associated with both the exposure and the outcome but is not a direct link in their causal chain. Its presence can lead to erroneous interpretations of the exposure's effect, either exaggerating or underestimating the true association. This...
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Linear Focal Elastosis: What We Know From Epidemiological Studies.

Tim Aung1,2,3, Rowland Noakes4,5, Kais Kasem6

  • 1Bond University, Gold Coast, Queensland, Australia.

The Australasian Journal of Dermatology
|August 27, 2025
PubMed
Summary
This summary is machine-generated.

Linear focal elastosis (LFE) presents as horizontal streaks, primarily on the lower back. This review of 80 cases suggests a 5:1 male predominance and highlights its occurrence in adolescents and older adults.

Keywords:
epidemiologylinear focal elastosisstriae

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Area of Science:

  • Dermatology
  • Epidemiology

Background:

  • Linear focal elastosis (LFE) is a skin condition with poorly understood causes and limited population data.
  • Characterized by horizontal streaks, LFE often affects the lower back.

Purpose of the Study:

  • To synthesize existing case reports on LFE.
  • To clarify demographic patterns, clinical features, and potential associations of LFE.

Main Methods:

  • A comprehensive literature search was conducted across major databases (PubMed, Embase, Ovid, ResearchGate).
  • Data from 80 identified cases of LFE were analyzed.

Main Results:

  • A male-to-female ratio of 5:1 was observed, with a mean age of 39 years.
  • LFE predominantly affected pubertal adolescents and adults over 60.
  • The lower back was the most common site, with associations to growth spurts and exercise noted.

Conclusions:

  • LFE exhibits specific demographic trends, particularly in adolescents and older adults.
  • Its asymptomatic nature and similarity to striae distensae may lead to underreporting.
  • Further research is needed to understand LFE pathogenesis and treatment.