Table 1.
Basic characteristics of participants from Tokyo.
| Total (n = 353,010) |
|||||
|---|---|---|---|---|---|
| No symptom (n = 337,370) (%) | (A) Current fever ≥ 37.5 °C (n = 5,724) (%) | (B) Current strong feeling of weariness or shortness of breath (n = 12,819) (%) | Both (A) and (B) (n = 2,903) (%) | Either (A) or (B) (n = 15,640) (%) | |
| Age, years | |||||
| Mean (SD) | 43.00 (12.22) | 36.49 (13.02) | 36.62 (11.39) | 35.79 (12.67) | 36.72 (11.77) |
| Range (Min–Max) | 15–101 | 15–101 | 15–101 | 15–101 | 15–101 |
| ≤ 19 | 4,788 (91.4) | 218 (4.2) | 342 (6.5) | 111 (2.1) | 449 (8.6) |
| 20–29 | 43,187 (90.9) | 1,744 (3.7) | 3,534 (7.4) | 946 (2.0) | 4,332 (9.1) |
| 30–39 | 87,265 (94.5) | 1,729 (1.9) | 4,237 (4.6) | 902 (1.0) | 5,064 (5.5) |
| 40–49 | 99,747 (96.5) | 1,185 (1.2) | 2,998 (2.9) | 565 (0.6) | 3,618 (3.5) |
| 50–59 | 71,360 (97.8) | 543 (0.7) | 1,292 (1.8) | 243 (0.3) | 1,592 (2.2) |
| 60–69 | 24,661 (98.5) | 163 (0.7) | 287 (1.2) | 70 (0.3) | 380 (1.5) |
| 70–79 | 5,685 (97.6) | 93 (1.6) | 87 (1.5) | 40 (0.7) | 140 (2.4) |
| 80–89 | 658 (92.4) | 38 (5.3) | 36 (5.1) | 20 (2.8) | 54 (7.6) |
| ≥ 90 | 19 (63.3) | 11 (36.7) | 6 (20.0) | 6 (20.0) | 11 (36. 7) |
| Sex | |||||
| Female | 213,732 (95.4) | 3,530 (1.6) | 8,395 (3.8) | 1,689 (0.8) | 10,236 (4.6) |
| Male | 123,099 (95.8) | 2,174 (1.7) | 4,379 (3.4) | 1,202 (0.9) | 5,351 (4.2) |
| Other | 539 (91.1) | 20 (3.4) | 45 (7.6) | 12 (2.0) | 53 (9.0) |
| Occupation | |||||
| Self-employed and family employees in agriculture, forestry and fisheries | 30,689 (89.2) | 565 (1.6) | 1,294 (3.8) | 322 (0.9) | 1,537 (4.5) |
| Self-employed and family employees in service and commerce | 38,802 (91.7) | 527 (1.2) | 1,228 (2.9) | 249 (0.6) | 1,506 (3.6) |
| Self-employed | 30,689 (95.2) | 565 (1.8) | 1,294 (4.0) | 322 (1.0) | 1,537 (4.8) |
| Employee (manager) in private company | 38,802 (96.3) | 527 (1.3) | 1,228 (3.1) | 249 (0.6) | 1,506 (3.7) |
| Employee in private company | 11,406 (91.6) | 456 (3.7) | 800 (6.4) | 208 (1.7) | 1,048 (8.4) |
| Government worker | 14,085 (96.6) | 176 (1.2) | 404 (2.8) | 79 (0.5) | 501 (3.4) |
| Student | 12,397 (94.0) | 311 (2.4) | 664 (5.0) | 183 (1.4) | 792 (6.0) |
| Part-time job | 18,206 (95.7) | 325 (1.7) | 657 (3.5) | 172 (0.9) | 810 (4.3) |
| Unemployed | 603 (96.0) | 13 (2.1) | 17 (2.7) | 5 (0.8) | 25 (4.0) |
| Others | 39,090 (97.8) | 346 (0.9) | 717 (1.8) | 182 (0.5) | 881 (2.2) |
| Pregnant | 4,146 (90.2) | 136,206 (95.2) | 2,436 (1.7) | 5,731 (4. 0) | 1,238 (0.9) |
| Taking antifebrile medications (Loxonin, Caronal, etc.) | |||||
| Current | 6,007 (59.3) | 2,219 (21.9) | 3,183 (31.4) | 1,280 (12.6) | 4,122 (40.7) |
| Past one month | 18,692 (87.4) | 922 (4.3) | 2,318 (10.8) | 540 (2.5) | 2,700 (12.6) |
| Medical conditions at baseline | |||||
| Cardiovascular diseases | 5,812 (94.7) | 128 (2.1) | 273 (4. 5) | 76 (1.2) | 325 (5.3) |
| Chronic obstructive pulmonary disease | 1,010 (86.6) | 42 (3.6) | 146 (12.5) | 31 (2.7) | 157 (13.5) |
| Kidney-related diseases | 2,322 (93.9) | 50 (2.0) | 130 (5.3) | 30 (1.2) | 150 (6.1) |
| Diabetes mellitus | 9,888 (95.6) | 164 (1.6) | 372 (3.6) | 84 (0.8) | 452 (4.4) |
| Malignant tumor with anticancer drugs | 1,435 (94.9) | 30 (2.0) | 64 (4.2) | 17 (1.1) | 77 (5.1) |
| Malignant tumor without anticancer drugs | 3,162 (95.6) | 56 (1.7) | 122 (3.7) | 32 (1.0) | 146 (4.4) |
| Treatment with immunosuppressant | 3,210 (92.9) | 84 (2.4) | 215 (6.2) | 55 (1.6) | 244 (7.1) |
| Undergo dialysis | 310 (94.8) | 11 (3.4) | 12 (3.7) | 6 (1.8) | 17 (5.2) |
| Preventive action | |||||
| Washing hands in runningwater (multiple times a day) | 208,200 (95.6) | 3,428 (1.6) | 7,942 (3.7) | 1,719 (0.8) | 9,651 (4.4) |
| Washing hands with soap and water (multiple times a day) | 314,399 (95.8) | 4,986 (1.5) | 11,388 (3.5) | 2,477 (0.8) | 13,897 (4.2) |
| Washing hands with alcohol (multiple times a day) | 232,235 (95.8) | 3,700 (1.5) | 8,303 (3.4) | 1,846 (0.8) | 10,157 (4.2) |
| Etiquette (masks, handkerchiefs, etc.) in case of coughing or sneezing | 309,387 (95.7) | 4,960 (1.5) | 11,341 (3.5) | 2,471 (0.8) | 13,830 (4.3) |
| Take time off from schoolor work when you have a fever or other symptoms | 166,700 (95.8) | 3,116 (1.8) | 5,766 (3.3) | 1,538 (0.9) | 7,344 (4.2) |
| Gargling with water | 209,314 (96.0) | 3,093 (1.4) | 7,142 (3.3) | 1,493 (0.7) | 8,742 (4.0) |
| Gargling with Isozine | 53,131 (95.5) | 830 (1.5) | 2,102 (3.8) | 453 (0.8) | 2,479 (4.5) |
| Regular ventilation | 201,519 (96.2) | 2,844 (1.4) | 6,478 (3.1) | 1,406 (0.7) | 7,916 (3.8) |
| Maintaining humidity | 104,404 (96.6) | 1,296 (1.2) | 3,090 (2.9) | 670 (0.6) | 3,716 (3.4) |
| A well-balanced diet | 178,354 (96.8) | 2,067 (1.1) | 4,736 (2.6) | 964 (0.5) | 5,839 (3.2) |
| Regular exercise | 93,859 (97.5) | 904 (0.9) | 1,978 (2.1) | 437 (0.5) | 2,445 (2.5) |
| Plenty of rest | 186,827 (96.6) | 2,353 (1.2) | 5,255 (2.7) | 1,102 (0.6) | 6,506 (3.4) |
| Telework | 73,568 (96.3) | 1,048 (1.4) | 2,309 (3.0) | 525 (0.7) | 2,832 (3.7) |
| Staggered commuting hour | 68,778 (96.3) | 929 (1.3) | 2,153 (3.0) | 459 (0.6) | 2,623 (3.7) |
| Avoidance of crowds other than staggered commuting hour | 114,895 (96.8) | 1,220 (1.0) | 3,131 (2.6) | 564 (0.5) | 3,787 (3.2) |
| Obtain up-to-date coronavirus information | 222,925 (96.2) | 3,004 (1.3) | 7,262 (3.1) | 1,458 (0.6) | 8,808 (3.8) |
| Other preventive action | 6,249 (95.6) | 85 (1.3) | 258 (3.9) | 51 (0.8) | 292 (4.5) |
| No preventive action | 676 (86.6) | 44 (5.6) | 89 (11.4) | 28 (3.6) | 105 (13.4) |