PMC

Odds ratios diverge from prevalence ratios as outcome prevalence in the reference group increases.

Measurement error in a continuous variable affects the proportion exceeding a threshold. Notes: Histograms are shown for body mass index in (A) the 13,102 New York City residents in the years 2000–2002 [], with 28.8% obesity based on the proportion of observations greater than or equal to 30 and (B) a hypothetical set of observations created by adding random error of up to 10 BMI units in either direction, with 37.8% obesity.

Odds ratios commonly reported in active living research. Notes: Box plots indicate the interquartile range (the rectangle is bounded by the 75^th and 25^th percentiles) and the interdecile range (lines extend to the 90^th and 10^th percentiles); variation in the distribution is shown for the entire Active Living Research Literature Database [], the subset for which authors had reviewed and confirmed the database entry, and for four commonly reported outcomes: meeting physical activity recommendations, inactivity, overweight, and obesity.