THE BUILDINGS
In all we studied nine buildings. Table I shows their forms of ventilation. We paired each of three that were naturally ventilated with a fully air conditioned building on the same site: buildings 1 and 2, 3 and 4, and 8 and 9. In each of these six buildings workers were interviewed blind and the details concerning their building entered after the questionnaire had been completed.
Buildings 1 and 2 were the first office buildings studied and drew our attention to a high incidence of complaints, which were included as the last six questions on the questionnaire in all subsequent studies.