Table 3. Estimated O/E ratio and its 95% confidence interval by categories and subgroups March, 2020 to October, 2021.
| Prefecture subgroup | ||||||
|
| ||||||
| <1,000 cases (per million population) (31 prefectures) |
1,000–2,000 cases (per million population) (10 prefectures) |
≥2,000 cases (per million population) (6 prefectures) |
||||
|
| ||||||
| Total number of observations/ expectations |
O/E ratio (95% CI) | Total number of observations/ expectations |
O/E ratio (95% CI) | Total number of observations/ expectations |
O/E ratio (95% CI) | |
| Job status | ||||||
| Worker | ||||||
| Employee | 798/589.1 | 1.35 (1.26–1.45) | 746/505.9 | 1.47 (1.37–1.58) | 1,010/484.9 | 2.08 (1.96–2.21) |
| Self-employed | 105/96.4 | 1.09 (0.89–1.31) | 67/62.4 | 1.07 (0.84–1.35) | 93/63.8 | 1.46 (1.18–1.78) |
| Non-worker | ||||||
| Pension and unemployment insurance liver |
1,178/1,062.8 | 1.11 (1.05–1.17) | 1,088/987.6 | 1.10 (1.04–1.17) | 989/872.1 | 1.13 (1.06–1.21) |
| Housewife | 618/535.8 | 1.15 (1.06–1.25) | 590/474.6 | 1.24 (1.15–1.35) | 705/468.1 | 1.51 (1.40–1.62) |
| Student | 181/123.8 | 1.46 (1.26–1.69) | 200/136.8 | 1.46 (1.27–1.67) | 264/93.3 | 2.83 (2.50–3.19) |
| Unemployed | 59/49.5 | 1.19 (0.91–1.52) | 38/27.7 | 1.37 (0.98–1.86) | 56/33.6 | 1.67 (1.27–2.14) |
| Other non-worker | 858/686.1 | 1.25 (1.17–1.34) | 712/649.1 | 1.10 (1.02–1.18) | 1,124/575.0 | 1.95 (1.84–2.07) |
| Unknown | 21/13.5 | 1.56 (0.98–2.32) | 21/17.8 | 1.18 (0.74–1.76) | 39/910.8 | 0.04 (0.03–0.06) |
| Motive | ||||||
| Health | 2,248/1,983.5 | 1.13 (1.09–1.18) | 2,556/2,081.6 | 1.23 (1.18–1.28) | 2,505/1,807.1 | 1.39 (1.33–1.44) |
| Family | 726/606.8 | 1.20 (1.11–1.29) | 641/497.3 | 1.29 (1.19–1.39) | 778/547.6 | 1.42 (1.32–1.52) |
| Economic | 224/191.6 | 1.17 (1.02–1.33) | 204/178.8 | 1.14 (0.99–1.30) | 282/172.8 | 1.63 (1.45–1.83) |
| Work-related | 171/123.3 | 1.39 (1.19–1.61) | 149/105.5 | 1.41 (1.20–1.65) | 211/103.3 | 2.04 (1.78–2.33) |
| Relationship | 166/119.2 | 1.39 (1.19–1.62) | 155/106.5 | 1.46 (1.24–1.70) | 235/118.5 | 1.98 (1.74–2.25) |
| School-related | 70/42.1 | 1.66 (1.30–2.08) | 70/51.4 | 1.36 (1.07–1.71) | 84/31.2 | 2.69 (2.16–3.31) |
| Other | 227/162.9 | 1.39 (1.22–1.58) | 192/108.6 | 1.77 (1.53–2.03) | 232/129.0 | 1.80 (1.58–2.04) |
| Unknown reasons | 1,097/791.1 | 1.39 (1.31–1.47) | 474/421.6 | 1.12 (1.03–1.23) | 1,189/1,392.9 | 0.85 (0.81–0.90) |
| Age, years | ||||||
| <20 | 176/110.1 | 1.60 (1.37–1.85) | 154/109.5 | 1.41 (1.20–1.64) | 198/110.4 | 1.79 (1.55–2.05) |
| 20–29 | 414/278.4 | 1.49 (1.35–1.63) | 401/269.6 | 1.49 (1.35–1.64) | 636/395.8 | 1.61 (1.49–1.73) |
| 30–39 | 398/290.6 | 1.37 (1.24–1.51) | 377/285.5 | 1.32 (1.19–1.46) | 493/405.7 | 1.22 (1.11–1.33) |
| 40–49 | 574/419.2 | 1.37 (1.26–1.48) | 570/445.8 | 1.28 (1.18–1.39) | 663/598.3 | 1.11 (1.03–1.19) |
| 50–59 | 553/467.9 | 1.18 (1.09–1.28) | 548/439.1 | 1.25 (1.15–1.36) | 698/576.2 | 1.21 (1.12–1.30) |
| 60–69 | 517/539.7 | 0.96 (0.88–1.04) | 469/427.6 | 1.10 (1.00–1.20) | 520/445.8 | 1.17 (1.07–1.27) |
| 70–79 | 662/616.6 | 1.07 (0.99–1.16) | 556/494.1 | 1.13 (1.03–1.22) | 644/519.9 | 1.24 (1.15–1.34) |
| ≥80 | 688/644.3 | 1.07 (0.99–1.15) | 390/386.5 | 1.01 (0.91–1.11) | 432/411.2 | 1.05 (0.95–1.15) |
CI, confidence interval; O/E ratio, ratio of observed to expected results.
Range of cumulative number of infected COVID-19 case per million population was 148 to 4,389 at January 2021.