Figure 4

Joinpoint regression models fitted to proportions of prostate cancer cases diagnosed late in metropolitan and non-metropolitan counties. Annual proportions of prostate cancer late-stage cases were computed for non-Hispanic white and black males 65 years and over that were diagnosed over the period 1981-2007 in metropolitan and non-metropolitan counties. Table 3 lists the estimate and 95% confidence intervals of the annual percent change (APC) for each segment, as well as the average annual percent change (AAPC) computed for the entire time period. Although the curves for white and black males are statistically non coincident, the hypothesis of parallelism of the two joinpoint regression models was not rejected at α = 0.05 in both metro and non-metro counties.