Table 1.
Characteristics of participants.
| January (n = 7210) |
June (n = 7210) |
September (n = 7210) |
|||
|---|---|---|---|---|---|
| n (%) | n (%) | n (%) | p-Value | ||
| Sex | Female | 3815 (52.9) | 3827(53.1) | 3823 (53.0) | 0.979 |
| Age | 20–29 | 1110 (15.4) | 1073 (14.9) | 1036 (14.4) | 0.935 |
| 30–39 | 1312 (18.2) | 1309 (18.2) | 1323 (18.4) | ||
| 40–49 | 1356 (18.8) | 1345 (18.7) | 1334 (18.5) | ||
| 50–59 | 1274 (17.7) | 1303 (18.1) | 1321 (18.3) | ||
| 60–69 | 1116 (15.5) | 1113 (15.4) | 1121 (15.6) | ||
| 70–80 | 1042 (14.5) | 1067 (14.8) | 1075 (14.9) | ||
| Area | Hokkaido | 311 (4.3) | 345 (4.8) | 341 (4.7) | 0.992 |
| Tohoku | 371 (5.2) | 393 (5.5) | 385 (5.3) | ||
| Kanto | 2788 (38.7) | 2737 (38.0) | 2757 (38.2) | ||
| Chubu | 1199 (16.3) | 1181 (16.4) | 1162 (16.1) | ||
| Kinki | 1410 (19.6) | 1413 (19.6) | 1415 (19.6) | ||
| Chugoku | 364 (5.1) | 354 (4.9) | 356 (4.9) | ||
| Shikoku | 179 (2.5) | 180 (2.5) | 182 (2.5) | ||
| Kyusyu | 588 (8.2) | 607 (8.4) | 612 (8.5) | ||
| Married | Yes | 4501 (62.4) | 4441 (61.6) | 4427 (61.4) | 0.403 |
| Child | Yes | 4186 (58.1) | 4132 (57.3) | 4133 (57.3) | 0.582 |
| Household income | <4 million yen | 1876 (26.2) | 1927 (26.7) | 1945 (27.0) | 0.574 |
| ≥4 million yen | 3632 (50.4) | 3644 (50.5) | 3622 (50.2) | ||
| unknown | 1702 (23.6) | 1639 (22.7) | 1643 (22.8) | ||
| Educational attainment | High School Graduate | 2118 (29.4) | 2111 (29.3) | 2108 (29.2) | 0.983 |
| Above Higher Education | 5092 (70.6) | 5099 (70.7) | 5102 (70.8) | ||
| Obesity | Yes | 1411 (19.6) | 1314 (18.2) | 1308 (18.1) | 0.050 |
| Smoking | Yes | 1151 (16.0) | 1137 (15.8) | 1113 (15.4) | 0.679 |
| Underlying disease | Yes | 2573 (35.7) | 2450 (34.0) | 2488 (34.5) | 0.083 |
| Health care worker | Yes | 808 (11.2) | 824 (11.4) | 830 (11.5) | 0.837 |
| COVID-19 vaccine | Two time | 0 (0) | 1288 (17.9) | 5009 (69.5) | <0.001 |
| One time | 0 (0) | 858 (11.9) | 799 (11.1) | ||
| Unvaccinated | 7210 (100) | 5064 (70.2) | 1402 (19.5) | ||
| vaccine hesitancy * in Unvaccinated | 1264 (17.5) | 4708 (93.0) | 1396 (99.6) | <0.001 | |
* Subjects among unvaccinated who answered, “strongly disagree” and “disagree” to the question “If the COVID-19 vaccine were available, would you want to be vaccinated?”.