claim: collider bias focuseds our understanding of covid-19 disease risk and severity
evidence_1: we illustrate these issues using data from the uk biobank in which individuals tested for covid-19 are highly selected for a wide range of genetic, behavioural, cardiovascular, demographic, and anthropometric traits.", "here, we highlight the challenge of interpreting observational evidence from such samples of the population, which may be affected by collider bias.", "we discuss the sampling mechanisms that leave aetiological studies of covid-19 infection and progression particularly susceptible to collider bias."
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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