Table 1

Exposure to ETS, by source and gender and inter-correlations between different sources of ETS exposure. Northern California Kaiser Permanente, 1979–85

		Men (n=16 524)				Women (26 197)
		Per cent exposed^1-150	Centiles among exposed (hours/week)			Per cent exposed	Centiles among exposed (hours/week)
Source of ETS exposure		25th	50th		75th	90th			25th	50th	75th	90th
Home	20	2	7	20	40		26	4	10	30	50
Small spaces other than home	43	2	5	20	40		41	3	8	32	40
Large indoor areas	53	2	4	9	21		45	2	4	8	22
Total exposure^1-151	68	3	9	29	47		64	4	12	40	58
Spearman correlation coefficients
Between home and small spaces other than home		0.19						0.27
Between home and large indoor areas		0.19						0.21
Between home and total exposure		0.47						0.57
Between small spaces other than home and large indoor areas		0.36						0.37
Between small spaces other than home and total exposure		0.71						0.73
Between large indoor areas and total exposure		0.72						0.63

↵1-150 Exposure for at least 1 hour/week.
↵1-151 Sum of home, small spaces other than home and large indoor areas.