Table 1.
Background information of sampled schools and selected health outcomes of students (including all students responding to the questionnaire, N = 4248).
| Attribute | Mean | Median | SD | Min | Max |
|---|---|---|---|---|---|
| Years as principal | 10.0 | 8 | 7.6 | 1.0 | 36.0 |
| Years in the building | 12.6 | 11.0 | 8.6 | 0.5 | 37.0 |
| Number of teachers in school | 11.0 | 7.0 | 10.8 | 1 | 100 |
| Number of other staffs | 7.0 | 5.0 | 8.8 | 0 | 120 |
| Number of pupils | 156.9 | 97 | 274.5 | 9 | 8011 |
| Buildings per school | 1.4 | 1.0 | 0.5 | 1 | 2 |
| School surface area (m2) | 2343.1 | 1288.0 | 4243.7 | 77 | 74,764 |
| Number of classrooms | 10.8 | 7.0 | 9.4 | 1 | 61 |
| Number of floors | 2.1 | 2.0 | .9 | 1 | 4 |
| Year of construction | 1981 | 1988 | 21.2 | 1880 | 2005 |
| Number of upper respiratory symptoms in spring semester (including students with no absenteeism) | 1.1 | 0.0 | 1.6 | 0 | 7 |
| Number of upper respiratory symptoms in spring semester (excluding students with no absenteeism) | 2.6 | 2.0 | 1.5 | 1 | 7 |
| Missed school days due to respiratory infections in spring semester (including students with no absenteeism) | 1.6 | 0.0 | 2.5 | 0 | 30 |
| Missed school days due to respiratory infections in spring semester (excluding students with no absenteeism) | 3.4 | 3.0 | 2.6 | 1 | 30 |