These data come from a survey carried out by Thomson Laboratories and Building Use Studies for the Building Research Establishment. They show the effects of wet cleaning. Cleaning was carried out as inconspicuously as possible over a weekend in one part of an office. The mean number of symptoms refers to the average number of chronic, building‐related symptoms per person (like headaches or dry eyes, which go away again when the person leaves the building) reported by the people in the study area. The control gives the results for another part of the same office which was not cleaned. These data show that wet cleaning (like shampooing the carpets and wiping down surfaces) significantly improves levels of chronic symptoms. Remember, though, that these results are only from one building, so they need to be further verified.
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