Table 2.

Characteristics of the 126 homes in the study.

Home characteristics		Unit	Average	Range	Percent
House	Floor area	m2	147	63 – 483	-
	Interior house volume	m3	368	156 – 1192	-
	Single story		-	-	24
	Single family house		-	-	78
	Duplex or flat		-	-	15
	Apartment building		-	-	3
	No. of bedrooms	n	3.0	1 – 6	-
	Heating system (Forced air)		-	-	88
	Central AC		-	-	30
	Ventilation fan		-	-	19
	Furnace filter change frequency times/yr		2.5	1 – 12	46
	Roof : slope (not flat)		-	-	99
Interior damage	Water	n	1.7	1 – 7	87
	Mold	n	2.0	1 – 6	26
	Condition	n	3.5	1 – 11	92
Child's sleeping area	Floor area	m2	12	4 – 46	-
	Room volume	m3	28	13 – 110	-
	No. of windows	n	1.7	1 – 5	97
	Wood, tile or linoleum floor		-	-	46
	Wall to wall carpeting		-	-	48
	Rugs on floor		-	-	3
Occupancy and activities	No. of adults	n	1.7	1 – 5	97
	No. of children	n	2.4	1 – 8	95
	Dogs present		1.2	1 – 3	31
	Cats present		1.2	1 – 2	9
	Either dogs or cats		-	-	36
Smoking	Never any smokers indoors		-	-	54
	Any smokers in household		-	-	60
	No. of smokers	n	1.7	1 – 5	60
	Rule 1: No smoking indoors	n	-	-	70
	Rule 2: Reduce smoking indoors	n	-	-	48
	Rule 3: Limit to one room	n	-	-	52
Cleaning	Use a vacuum cleaner		-	-	44
	Swept or dusted CSA in the last 2 weeks		3.1	1 – 5	-
	Swept or dusted CSA in the last 2 weeks		-	-	100
AER	Living room	h−1	0.76	0.10–3.06	-
	Bedroom	h−1	1.67	0.22–9.52	-