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Cause and Effect01:53

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While variables are sometimes correlated because one does cause the other, it could also be that some other factor, a confounding variable, is actually causing the systematic movement in our variables of interest. For instance, as sales in ice cream increase, so does the overall rate of crime. Is it possible that indulging in your favorite flavor of ice cream could send you on a crime spree? Or, after committing crime do you think you might decide to treat yourself to a cone?
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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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Causal relationship between distinct sleep characteristics and delirium: A multivariable Mendelian randomization

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  • 1College of Nursing, Fujian University of Traditional Chinese Medicine, Fuzhou, China.

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Certain sleep patterns, like oversleeping and evening chronotypes, increase delirium risk. Morning chronotypes and daytime napping may protect against delirium, offering new prevention insights.

Keywords:
Mendelian randomizationdeliriumgenome-wide association studysleep

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Area of Science:

  • Neurology
  • Sleep Medicine
  • Genetics

Background:

  • Delirium is a frequent neurological complication in hospitalized patients, strongly associated with sleep disturbances.
  • The complex interplay of sleep rhythms and individual sleep features complicates understanding their direct link to delirium risk.

Purpose of the Study:

  • To investigate the potential causal relationships between specific sleep characteristics and the risk of delirium.
  • To determine the independent effects of various sleep traits on delirium development.

Main Methods:

  • Utilized two-sample Mendelian randomization (MR) analysis with inverse-variance weighted (IVW) as the primary method.
  • Employed sensitivity analyses, including heterogeneity and pleiotropy tests, to ensure result robustness.
  • Conducted multivariable MR to identify direct causal links and adjust for confounding sleep factors.

Main Results:

  • Oversleeping (OR=5.561) and evening chronotype (OR=1.879) significantly increased delirium risk.
  • Morning chronotype (OR=0.544) and daytime dozing (OR=0.134) demonstrated protective effects against delirium.
  • Multivariable MR confirmed evening chronotype (OR=3.860) as a risk factor, and daytime napping (OR=10.427) as a significant risk factor after adjustment.

Conclusions:

  • Specific sleep characteristics, such as oversleeping and evening chronotype, are causally linked to increased delirium risk.
  • Morning chronotype and daytime dozing may offer protection against delirium.
  • Findings highlight modifiable sleep-related factors for potential delirium prevention strategies.