Bias introduced by conditioning on an intermediate variable: Comment on the article by Zhang et al

Arthritis Care Res (Hoboken). 2011 May;63(5):784. doi: 10.1002/acr.20443.
No abstract available

Publication types

  • Letter
  • Comment

MeSH terms

  • Bias
  • Disease Progression
  • Humans
  • Osteoarthritis, Knee / diagnostic imaging
  • Osteoarthritis, Knee / etiology*
  • Radiography
  • Randomized Controlled Trials as Topic / methods*
  • Research Design*
  • Risk Assessment
  • Risk Factors