Table 1.
Results of the spatial scan analysis of female breast cancer mortality at the county level in Shandong for the years 2011 to 2013.
| Cluster | County amount | Cases | Expected | RR | LLR | P value |
|---|---|---|---|---|---|---|
| Total without adjustment for age | ||||||
| Most likely cluster | 25 | 2265 | 1651 | 1.46 | 125.69 | <0.001 |
| Secondary cluster 1 | 1 | 399 | 196 | 2.01 | 78.17 | <0.001 |
| Secondary cluster 2 | 1 | 174 | 79 | 2.24 | 46.31 | <0.001 |
| Secondary cluster 3 | 3 | 443 | 287 | 1.54 | 36.65 | <0.001 |
| Secondary cluster 4 | 9 | 942 | 751 | 1.31 | 30.47 | <0.001 |
| Secondary cluster 5 | 1 | 197 | 124 | 1.56 | 17.15 | <0.001 |
| Secondary cluster 6 | 1 | 90 | 55 | 1.59 | 8.29 | <0.01 |
| Total adjusted for age | ||||||
| Most likely cluster | 7 | 668 | 420 | 1.64 | 65.94 | <0.001 |
| Secondary cluster 1 | 1 | 133 | 54 | 2.48 | 40.97 | <0.001 |
| Secondary cluster 2 | 24 | 1315 | 1088 | 1.25 | 25.95 | <0.001 |
| Secondary cluster 3 | 1 | 154 | 85 | 1.82 | 22.47 | <0.001 |
| Secondary cluster 4 | 9 | 633 | 516 | 1.25 | 13.19 | <0.001 |
| Secondary cluster 5 | 1 | 66 | 38 | 1.77 | 8.86 | <0.05 |
| Urban without adjustment for age | ||||||
| Most likely cluster | 3 | 211 | 94 | 2.32 | 55.61 | <0.001 |
| Secondary cluster 1 | 5 | 287 | 171 | 1.73 | 34.21 | <0.001 |
| Secondary cluster 2 | 19 | 871 | 706 | 1.29 | 21.74 | <0.001 |
| Secondary cluster 3 | 7 | 489 | 396 | 1.27 | 11.31 | <0.01 |
| Urban adjusted for age | ||||||
| Most likely cluster | 5 | 233 | 119 | 2.04 | 44.77 | <0.001 |
| Secondary cluster 1 | 3 | 153 | 65 | 2.42 | 43.99 | <0.001 |
| Secondary cluster 2 | 1 | 86 | 50 | 1.73 | 10.69 | <0.01 |
| Rural without adjustment for age | ||||||
| Most likely cluster | 59 | 3789 | 3159 | 1.42 | 110.66 | <0.001 |
| Secondary cluster 1 | 8 | 692 | 467 | 1.53 | 51.16 | <0.001 |
| Secondary cluster 2 | 1 | 124 | 61 | 2.05 | 25.28 | <0.001 |
| Secondary cluster 3 | 1 | 162 | 100 | 1.63 | 16.2 | <0.001 |
| Rural adjusted for age | ||||||
| Most likely cluster | 8 | 504 | 318 | 1.65 | 49.7 | <0.001 |
| Secondary cluster 1 | 59 | 2453 | 2155 | 1.28 | 36.24 | <0.001 |
| Secondary cluster 2 | 1 | 93 | 42 | 2.26 | 23.69 | <0.001 |
| Secondary cluster 3 | 1 | 127 | 68 | 1.88 | 20.28 | <0.001 |
Note: “Most likely cluster” was defined when the maximum log likelihood ratio (LLR) with statistical significance was detected by Monte Carlo simulation in the spatial analysis; the other LLR values with statistical significance were identified as the “Secondary cluster”. The relative risk (RR) was the ratio of the mortality inside a cluster area to the mortality outside a cluster area.