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Construction of a North American Cancer Survival Index to Measure Progress of Cancer Control Efforts

ORIGINAL RESEARCH — Volume 14 — September 14, 2017

PEER REVIEWED

Figures 1a and 1b show funnel plots of 5-year relative survival plotted against precision, such that low-precision estimates are on the left side, and high-precision estimates are on the right side. The survival estimates in Figure 1b are overall much closer to the line for the United States combined. The figures are a graphic representation of the data in Table 2 that use a function of the standard error for precision

Figure.
Graph a shows a funnel plot of 5-year age-standardized relative survival ratios for all cancer sites combined for men and women diagnosed with cancer from 2006 through 2012 and followed up on December 31, 2012. Graph b shows a funnel plot of 5-year age-, sex-, and site-standardized relative survival ratios, calculated by using the North American Cancer Survival Index (CSI), for men and women diagnosed with cancer from 2006 through 2012 and followed up on December 31, 2012. Graphs a and b show funnel plots of 5-year relative survival plotted against precision, such that low-precision estimates are on the left side, and high-precision estimates are on the right side. Precision was calculated as the inverse of the variance of the survival estimates. The control limits were established by using the range of standard errors from the registry-specific survival estimates and are shown as the lower and upper percentile limits of the standard Normal distribution (z = 1.96 for 95% control limits and z = 3.09 for 99.8% control limits) around US combined estimates. Graph a shows the dramatic variation in estimates of relative survival by registry jurisdiction for all sites combined. Graph b shows substantially less variation using the CSI, which is standardized by age, sex, and cancer-site mix, than in using the all sites combined statistics set. The survival estimates in graph b are overall much closer to the line for the United States combined. The figures are a graphic representation of the data in Table 2 that use a function of the standard error for precision.

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