Table A1.
Distributions of Homophily * and Heterogeneous ** Chains in Viral Transmission Networks by Prefecture.
| Variable | Class | Hokkaido | Kanagawa | p-Value | ||
|---|---|---|---|---|---|---|
| (Total No. of Chains = 763) | (Total No. of Chains = 659) | |||||
| No. of Chains | % | No. of Chains | % | |||
| Sex | ||||||
| Homophily Class | Female: (0, 0) | 185 | 24.25 | 165 | 25.04 | |
| Male: (1, 1) | 194 | 25.43 | 152 | 23.07 | 0.59 | |
| Heterogeneous class | Other: (1, 0) or (0, 1) | 384 | 50.33 | 342 | 51.90 | |
| Age | ||||||
| Homophily Class | Age < 30: (1, 1) | 26 | 3.41 | 89 | 13.51 | |
| 30 ≤ Age < 60: (2, 2) | 72 | 9.44 | 161 | 24.43 | ||
| Age ≥ 60 (3, 3) | 248 | 32.50 | 116 | 17.60 | <0.001 | |
| Heterogeneous class | Other: (1, 2), (2, 1), (1, 3), (3, 1), (2, 3) or (3, 2) | 417 | 54.65 | 293 | 44.46 | |
| Asymptomatic Status | ||||||
| Homophily Class | No: (0, 0) | 277 | 36.30 | 563 | 85.43 | |
| Yes: (1, 1) | 372 | 48.75 | 16 | 2.43 | <0.001 | |
| Heterogeneous class | Other: (1, 0) or (0, 1) | 114 | 14.94 | 80 | 12.14 | |
| Fever | ||||||
| Homophily Class | No: (0, 0) | 433 | 56.75 | 63 | 9.56 | |
| Yes: (1, 1) | 225 | 29.49 | 385 | 58.42 | <0.001 | |
| Heterogeneous class | Other: (1, 0) or (0, 1) | 105 | 13.76 | 211 | 32.02 | |
| Headache | ||||||
| Homophily Class | No: (0, 0) | 683 | 89.52 | 491 | 74.51 | |
| Yes: (1, 1) | 4 | 0.52 | 19 | 2.88 | <0.001 | |
| Heterogeneous class | Other: (1, 0) or (0, 1) | 76 | 9.96 | 149 | 22.61 | |
| Body ache | ||||||
| Homophily Class | No: (0, 0) | 697 | 91.35 | 565 | 85.74 | |
| Yes: (1, 1) | 9 | 1.18 | 7 | 1.06 | <0.001 | |
| Heterogeneous class | Other: (1, 0) or (0, 1) | 57 | 7.47 | 87 | 13.20 | |
| Gastrointestinal | ||||||
| Homophily Class | No: (0, 0) | 716 | 93.84 | 485 | 73.60 | |
| Yes: (1, 1) | 4 | 0.52 | 9 | 1.37 | <0.001 | |
| Heterogeneous class | Other: (1, 0) or (0, 1) | 43 | 5.64 | 165 | 25.04 | |
| Mild/upper respiratory | ||||||
| Homophily Class | No: (0, 0) | 545 | 71.43 | 220 | 33.38 | |
| Yes: (1, 1) | 70 | 9.17 | 151 | 22.91 | <0.001 | |
| Heterogeneous class | Other: (1, 0) or (0, 1) | 148 | 19.40 | 288 | 43.70 | |
| Severe/lower respiratory | ||||||
| Homophily Class | No: (0, 0) | 543 | 71.17 | 265 | 40.21 | |
| Yes: (1, 1) | 67 | 8.78 | 88 | 13.35 | <0.001 | |
| Heterogeneous class | Other: (1, 0) or (0, 1) | 153 | 20.05 | 306 | 46.43 | |
| Sensory disruption | ||||||
| Homophily Class | No: (0, 0) | 678 | 88.86 | 485 | 73.60 | |
| Yes: (1, 1) | 14 | 1.83 | 23 | 3.49 | <0.001 | |
| Heterogeneous class | Other: (1, 0) or (0, 1) | 71 | 9.31 | 151 | 22.91 | |
* Homophily chain refers to the situation where an infector and his/her infectee shares the same characteristics. ** Heterogeneous chain refers to the situation where an infector and his/her infectee have different characteristics.The chain number for each of the homophily classes is shown for Hokkaido and Kanagawa. The symptom homophily classes assessed were fever, headache, body ache, gastrointestinal issues (nausea and vomiting), upper respiratory involvement (cough, sneezing, rhinitis), lower respiratory involvement (dyspnea), and sensory disruption (anosmia and ageusia). We also assessed the number of homophily chains for age, sex, and asymptomatic status.