Table 1 Characteristics of prefectural variables (Prefectures: N = 47)
| Â | 1996 | 2001 | 2006 | 2011 | 2016 | 2022 |
|---|---|---|---|---|---|---|
| Â | ||||||
 Min | 20.0 | 38.9 | 28.3 | 35.1 | 41.8 | − |
 25%tile | 32.1 | 53.7 | 44.1 | 51.6 | 58.8 | − |
 50%tile | 39.5 | 66.9 | 51.4 | 62.2 | 70.3 | − |
 75%tile | 46.7 | 77.7 | 60 | 71.5 | 81.2 | − |
 Max | 52.9 | 104.4 | 74.9 | 90 | 105.2 | − |
Nurses’ wages, 1000yen/h [26] |  | |||||
 Mean | − | 2.30 | 2.21 | 2.27 | 2.33 | − |
 SD | − | 0.19 | 0.18 | 0.2 | 0.16 | − |
| Â | ||||||
 Min | 8.8 | 9.2 | 9.7 | 11.0 | 12.1 | − |
 25%tile | 11.2 | 11.8 | 12.6 | 13.8 | 15.0 | − |
 50%tile | 12.8 | 13.6 | 14.1 | 15.9 | 17.0 | − |
 75%tile | 14.6 | 15.5 | 16.5 | 18.2 | 19.5 | − |
Max | 18.2 | 19.7 | 20.9 | 21.9 | 24.6 | − |
 Min | 0.871 | 0.846 | 0.824 | 0.804 | 0.790 | − |
 25%tile | 0.335 | 0.327 | 0.315 | 0.318 | 0.315 | − |
 50%tile | 0.453 | 0.431 | 0.404 | 0.386 | 0.373 | − |
 75%tile | 0.610 | 0.589 | 0.577 | 0.553 | 0.565 | − |
 Max | 0.759 | 0.731 | 0.700 | 0.689 | 0.706 | − |
Number of designated cancer care hospitals per 10,000 people [29,30,31,32,33,34,35] | ||||||
 Min | − | − | 0.000 | 0.013 | 0.018 | 0.019 |
 25%tile | − | − | 0.009 | 0.030 | 0.033 | 0.035 |
 50%tile | − | − | 0.014 | 0.038 | 0.043 | 0.045 |
 75%tile | − | − | 0.028 | 0.048 | 0.053 | 0.056 |
 Max | − | − | 0.081 | 0.084 | 0.086 | 0.105 |
Total population 1000 people [35] | ||||||
 Min | 619 | 617 | 610 | 592 | 579 | 552 |
 25%tile | 1188 | 1185 | 1171 | 1148 | 1128 | 1057 |
 50%tile | 1795 | 1783 | 1760 | 1714 | 1680 | 1605 |
 75%tile | 2871 | 2872 | 2871 | 2853 | 2863 | 2789 |
Max | 11500 | 11800 | 12300 | 12700 | 13400 | 13800 |
Percentage of the population aged 65Â years and older [35] | ||||||
 Min | 10.3 | 13.2 | 15.9 | 16.9 | 19.4 | 22.8 |
 25%tile | 15.0 | 17.5 | 19.9 | 22.4 | 26.2 | 29.3 |
 50%tile | 17.6 | 19.9 | 22.5 | 24.5 | 28.1 | 31.0 |
 75%tile | 18.7 | 21.6 | 23.9 | 26.1 | 29.6 | 33.1 |
 Max | 22.0 | 25.2 | 27.1 | 29.1 | 33.3 | 37.8 |
Average income per capita, 1000Â yen [36] | ||||||
 Min | 2066 | 2097 | 2025 | 2007 | 2344 | − |
 25%tile | 2633 | 2496 | 2484 | 2413 | 2632 | − |
 50%tile | 2947 | 2768 | 2791 | 2657 | 2909 | − |
 75%tile | 3199 | 2952 | 2977 | 2816 | 3060 | − |
 Max | 4359 | 4462 | 5970 | 5220 | 5759 | − |