Figure 1.
Odds ratio for the age effect in the intention to be screened analysis. The odds ratio describes the effect relative to the baseline odds at age 50. Older women have greater odds of being in the precontemplative state, and the association is statistically significant since the pointwise 95% confidence intervals generally do not cover one except where data is sparse. The vertical lines at the bottom of the figure, sometimes described as the rug, represent the distribution of the observed data.