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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	%
Studies of CCP:
	Fristedt and Pettersson 1980	Sweden	Authors surveyed 3,000 workers and described those with complaints.	180	122	68	A greater incidence of skin symptoms was reported with clay-based CF than with phenolic-based CF. A greater incidence of mucous membrane symptoms was reported with phenolic-based CF than with clay-based CF.
	Andersson et al. 1980	Sweden	Authors surveyed subjects at 5 sites comparing atopics and nonatopics exposed to CCP:	341			Increased complaints of skin, eye, and mucous membrane irritation were associated with CCP. More frequent itching and dry skin were reported in atopic patients or those with existing skin disease than in nonatopic patients or those lacking prior skin symptoms.
			Atopics	29	9	12–52
			Nonatopics	194	39	8–7

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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.