Table 2.
Number of observations in the different tasks of the study.
| Phase I | Phase II |
||
|---|---|---|---|
| December 2010 | Visit 1 (“Spring”) March–May 2011 |
Visit 2 (“Winter”) December 2011–February 2012 |
|
| Building characteristicsa | 45 (100%) | – | – |
| Ventilation surrogates (CO2)a | 45 (100%) | 19 (95%) | 17 (85%) |
| Ventilation (PFT)a | – | – | 16 (80%) |
| Air pollutantsa | – | 19 (95%) | 17 (85%) |
| Health screening questionnaires | 3186 (61.7%) | – | – |
| ISAAC questionnaires | – | 1221 (53.4%) | – |
| Recent complaints (“follow-up”) questionnaires | – | 755 (33%) | 667 (29.2%) |
| Exhaled breath condensate | – | – | 100 |
| Virus collections | – | – | 94 |
| Parental stress questionnaires | – | 533 | 255 |
| Urine cortisol test | – | 127 | 98 |
Building and IAQ characteristics refer to the number of DCCs evaluated. Health variables relate to the number of children evaluated. Percentages represent the proportion of individuals (DCCs or children) evaluated out of the eligible population at a given time point and “–” means that measurement was not applicable at that time.
a
Presented data concern the number of DCCs.