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Table 4–3(Continued). Summary of cross-sectional studies that used questionnaires to assess the health effects of indoor air contaminants in general or CCP specifically

	Study	Country	Methods	CCP-exposed workers			Results
				Number responding to survey[1]	Workers with complaints
					Number	%
	Zweers et al. 1992	Netherlands	Authors surveyed 10,500 workers in 61 office buildings.	Unknown	Unknown	Unknown	The study found statistically significant associations of handling CCP with oronasal symptoms (OR=1.18), perception of air contaminants (OR=1.48), air quality complaints (OR=1.21), and lighting complaints (OR=1.30). Near-significant elevations found for eye and fever symptoms.

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See footnotes at end of table.

1. The number of CCP-exposed workers surveyed was not generally known except for those responding to the surveys; therefore, response rates were unknown.