Table 1 Case‐control comparisons of basic characteristics at reference date.
| Control | Case | Total | |
|---|---|---|---|
| Age (years) | |||
| 30–39 | 78 (23.64) | 22 (22.68) | 100 (23.42) |
| 40–49 | 46 (13.94) | 14 (14.43) | 60 (14.05) |
| 50–59 | 150 (45.45) | 46 (47.43) | 196 (45.90) |
| 60–69 | 56 (16.97) | 15 (15.46) | 71 (16.63) |
| Sex | |||
| Male | 132 (40.00) | 45 (46.39) | 177 (41.45) |
| Female | 198 (60.00) | 52 (53.61) | 250 (58.55) |
| Residential area | |||
| Tokyo (met*) | 124 (37.58) | 42 (43.30) | 166 (38.88) |
| Tokyo (mun†) | 54 (16.36) | 18 (18.56) | 72 (16.86) |
| Chiba | 42 (12.73) | 10 (10.31) | 52 (12.18) |
| Kanagawa | 48 (14.55) | 12 (12.37) | 60 (14.05) |
| Saitama | 62 (18.79) | 15 (15.46) | 77 (18.03) |
| Timing of interview | |||
| 00/12–01/11 | 25 (7.58) | 20 (20.62) | 45 (10.54) |
| 01/12–02/11 | 65 (19.69) | 32 (32.99) | 97 (22.71) |
| 02/12–03/11 | 134 (40.61) | 33 (34.02) | 167 (39.11) |
| 03/12–04/11 | 99 (30.00) | 12 (12.37) | 111 (26.00) |
| 04/12–05/03 | 7 (2.12) | 0 (0.00) | 7 (1.64) |
| Education | |||
| Junior high school‡ | 18 (5.45) | 9 (9.28) | 27 (6.32) |
| High school§ | 192 (58.19) | 51 (52.57) | 243 (56.91) |
| College/graduate¶ | 120 (36.36) | 37 (38.15) | 157 (36.76) |
| Marital status | |||
| Single | 26 (7.88) | 14 (14.43) | 40 (9.37) |
| Married | 280 (84.85) | 79 (81.44) | 359 (84.07) |
| Divorced | 13 (3.94) | 1 (1.03) | 14 (3.28) |
| Deceased | 11 (3.33) | 3 (3.09) | 14 (3.28) |
*Metropolitan area of Tokyo.
†Municipalities of Tokyo.
‡Up to 9 years.
§Up to 14 years.
¶16 years or more.