Table 1.
School type |
||||
---|---|---|---|---|
Primary n (% in primary schools) | Secondary n (% in secondary schools) | Both settings n (%) | P value (primary vs secondary schools)* | |
Total number of schools | 100 | 79 | 179 | |
Total cases (% of cases across both settings) | 799 | 1515 | 2314 | |
Student cases | 328 (41%) | 1105 (73%) | 1433 (62%) | P <0.001 |
Staff cases | 471 (59%) | 410 (27%) | 881 (38%) | |
Median (IQR) number of cases per outbreak | 6 (4–10) | 15 (8–28) | 9 (5–16) | P<0.001 |
Mode number of cases per outbreak | 3 | 6 | 6 | |
Total numbers of cases per outbreak | 2–35 | 2–100 | 2–100 | |
Index case in the outbreak | ||||
Teaching staff | 48 (48%) | 25 (32%) | 73 (41%) | P = 0.012 |
Student | 35 (35%) | 47 (59%) | 82 (46%) | |
Non-teaching staff | 9 (9%) | 6 (8%) | 15 (8%) | |
Another source | 1 (1%) | 0 (0%) | 1 (1%) | |
Not reported | 7 (7%) | 1 (1%) | 8 (4%) | |
Groups affected by the outbreak | n (%) | n (%) | % | |
Staff only | 6 (6%) | 1 (1%) | 7 (4%) | P<0.001 |
1 year group only | 39 (39%) | 5 (6%) | 44 (25%) | |
2 year groups | 30 (30%) | 7 (9%) | 37 (21%) | |
3 or more year groups | 25 (25%) | 66 (84%) | 91 (51%) |
Proportions were compared using chi squared or Fishers Exact Test, medians with interquartile ranges were compared using the Mann-Whitney U Test.