Control of confounding requires specification of risk periods

Epidemiology. 1993 Nov;4(6):556-7. doi: 10.1097/00001648-199311000-00014.
No abstract available

Publication types

  • Letter
  • Comment

MeSH terms

  • Case-Control Studies
  • Cholelithiasis / epidemiology
  • Cholelithiasis / etiology
  • Confounding Factors, Epidemiologic*
  • Female
  • Humans
  • Incidence
  • Odds Ratio
  • Pregnancy
  • Risk Factors
  • Smoking / adverse effects
  • Time Factors