Fig. 1

Public Health District patterns of colon endoscopy use are inversely correlated with adverse colorectal cancer outcomes. Mississippi BRFSS Public Health District survey report data (http://msdh.ms.gov/brfss/index.htm) from Black Mississippians (blue dots) and White Mississippians (red crosses) were obtained from the District Reports for the years 2006, 2008 and 2010, then averaged and plotted along the abscissa. Panel a The average age-adjusted CRC incidence rates from 2006 through 2010 for Black and White subsets were obtained from the Mississippi Cancer Registry for each of the nine Public Health Districts, then plotted on the ordinate. These Black and White subsets were subjected to a common Spearman rank correlation analysis to obtain a correlation coefficient of −0.800 (P < 0.0001). The P values associated with correlation coefficients were reported against the null hypothesis of no association. Panel b Average age-adjusted CRC mortality rates were obtained from the Mississippi Cancer Registry (http://www.cancer-rates.info/ms/index.php) for Black and White subsets from the years 2006 through 2010 for each of the nine Public Health Districts, then plotted along the ordinate. The Spearman rank correlation coefficient between these two variables was −0.796 (P < 0.0001)