Table 1.

Selected pre-intervention characteristics of wood stove homes participating in ARTIS, by sampling visit (N = 96 homes)

	Visit 1 (N = 88)			Visit 2 (N = 84)
		na	%a		na	%a
	nb			nb
Demographic characteristics
Community, pre-intervention winter years	88			84
Hamilton, 2008–09		11	13		9	11
Missoula, 2009–10		20	23		21	25
Nez Perce, 2009–10		6	7		6	7
Butte, 2010–11		7	8		8	10
Fairbanks, 2010–11		8	9		8	10
western MT, 2011–12		36	41		32	38
Household income $50,000 or more	81	33	41	76	32	42
Caregiver’s education college degree or more	79	34	43	74	34	46
Children in home, mean(sd)	82	2.5	1.3	77	2.5	1.3
Wood, wood stove and usage
method of acquiring wood	79			79
harvest		50	63		50	63
purchase		29	37		29	37
wood age	85			83
< 1 year		31	36		27	33
1 year		28	33		27	33
2 years+		26	31		29	35
woodstove opened, mean(sd)	88	10.8	7.4	83	10.1	6.8
burn intensity	85			80
none/light		20	24		22	28
average/heavy		65	76		58	72
Activities in or near the home
use of other source of heating	88	53	60	83	50	60
burning (smoke, incense, candle, etc.)	88	29	33	83	24	29
open door or window	88	29	33	83	32	39
Home characteristics
house	87	61	70	83	61	73
square footage of home, mean(sd)	74	1932	856	70	1968	842
dog	87	68	78	83	65	78
cat	81	42	52	78	44	56
indoor temperature (° Celsius), mean (sd)	76	22.1	2.5	79	21.9	2.7
indoor humidity (%rh), mean (sd)	74	28.5	8.1	79	28.7	8.0
Meteorology
temperature (° Celsius)	87	−3.6	9	81	−2.1	7.7
humidity (%rh)	87	73.2	12.1	81	74.9	11.8
precipitation (inches)	87	0.03	0.05	81	0.02	0.05
wind (miles per hour)	87	3.5	2.6	81	3.3	2.3
% of day spent in home by child, mean(sd)	78	64.8	16.4	76	66	16.0

Abbreviation: sd, standard deviation

^aNumbers refer to the number and percentage of homes with a given characteristic except where otherwise specified.

^bNumber of homes with information on a specified characteristic for each visit.