Geographic distribution of female colorectal cancer. The fill color in each ZIP code represents the SMR, with green indicating relatively low SMR and purple representing relatively high SMR. White indicates SMR near 1 (observed and expected equivalent). The ZIP codes outlined and cross-hatched in orange had significantly high incidences and formed local clusters under Moran's test. The ZIP code outlined and cross-hatched in yellow was a significant spatial outlier by the local Moran test, though its SMR is not significantly different from 1. The black outlines describe ZIP code boundaries. Labels identify the centering ZIP codes for each cluster or outlier. The strip of Fire Island outlined in orange is part of ZIP code 11782, the main portion of which is a neighbor of 11705 on Long Island proper.