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Table 1 Hypothetical example* of trends of odds ratio and prevalence ratio by social class (low versus high class)

From: Monitoring trends in socioeconomic health inequalities: it matters how you measure

  Time 1 Time 2
  Low class High class Low class High class
Outcome prevalence (P) 0.75 0.60 0.60 0.43
Odds, P/(1-P) 3.00 1.50 1.50 0.75
OR 2.00 1.99
PR 1.25 1.40
  1. OR = odds ratio; PR = prevalence ratio.
  2. * This example can be replicated when there is no other confounding variable.
  3. OR (odds ratio) was calculated by Plow class/(1--Plow class) ÷ Phigh class/(1--P high class).
  4. PR (prevalence ratio) was calculated by Plowclass ÷ Phigh class.