Table 3.
Parameter distribution characteristics by genotype.
| GII.2 | GII.4 | GII.17 | P | |
|---|---|---|---|---|
| Schools involved | ||||
| Number of schools involved (n = 49) | 14 (28.0%) | 26 (52.0%) | 9 (18.0%) | <0.001 |
| Middle school (n = 4) | 1 (25.0%) | 2 (50.0%) | 1 (25.0%) | 1.000 |
| Primary school (n = 22) | 4 (18.2%) | 14 (63.6%) | 4 (18.2%) | 0.326 |
| Kindergarten school (n = 23) | 9 (39.1%) | 10 (43.5%) | 4 (17.4%) | 0.347 |
| Basic characteristics of the epidemics | ||||
| Total student cases (n = 782) | 225 (28.8%) | 396 (50.6%) | 161 (20.6%) | <0.001 |
| Total employee cases (n = 9) | 3 (33.3%) | 4 (44.4%) | 2 (22.2%) | 0.716 |
| Male cases (n = 412) | 107 (46.9%) | 217 (54.3%) | 88 (54.0%) | 0.181 |
| Female cases (n = 379) | 121 (53.1%) | 183 (45.7%) | 75 (46.0%) | |
| Interval between the first and last cases in days | 4.0 ± 2.6 | 3.4 ± 1.6 | 2.9 ± 1.7 | 0.425 |
| Month of outbreaks | 10 (8, 12) | 4 (3, 5) | 3 (3, 5) | / |
| Primary symptoms | ||||
| Cases with vomiting (n = 751) | 202 (88.6%) | 389 (97.3%) | 160 (98.2%) | <0.001 |
| Cases with nausea (n = 376) | 100 (43.9%) | 156 (39.0%) | 120 (73.6%) | <0.001 |
| Cases with abdominal pain (n = 210) | 52 (22.8%) | 105 (26.3%) | 53 (32.5%) | 0.099 |
| Cases with fever (n = 130) | 34 (14.9%) | 66 (16.5%) | 30 (18.4%) | 0.655 |
| Cases with diarrhoea (n = 79) | 23 (10.1%) | 39 (9.8%) | 17 (10.4%) | 0.969 |
Categorical data are presented as frequencies with percentages; the intervals between the first and last cases are presented as the mean ± standard deviation; months of outbreaks are presented as the median (upper and lower quartiles). For categorical data, differences among groups were examined using the chi-square test or Fisher’s exact probability test when n ≤ 300. For continuous data, one-way ANOVA was used to determine differences among groups.
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