. Author manuscript; available in PMC: 2016 Oct 5.

Published in final edited form as: Occup Environ Med. 2015 Apr 20;72(6):394–400. doi: 10.1136/oemed-2014-102696

Table 2.

Summary Statistics for Exposure Variables by HEPA Filtration Status (Mean ± SD (Median))

		PM_2.5 (μg/m³)		Absorbance (x 10⁻⁵ m⁻¹)		Levoglucosan (ng/m³)		Outdoor Temperature (°C)
		Indoors	Outdoors	Indoors	Outdoors	Indoors	Outdoors
ALL HOMES N = 68	HEPA Filter Off	7.1±6.1 (7.5)	5.7±2.8 (5.5)	2.3±0.3 (2.2)	3.1±2.7 (2.3)	13.8±36.5 (2.5)	17.9±47.8 (3.5)	10.7±5.2 (10.8)
ALL HOMES N = 68	HEPA Filter On	4.3±2.6 (3.7)	5.4±2.2 (5.6)	2.1±0.2 (2.0)	2.3±1.3 (2.3)	10.1±16.3 (1.4)	11.2±17.1 (3.8)	10.5±5.4 (11.1)
HOMES IN TRAFFIC- IMPACTED LOCATIONS N = 48	HEPA Filter Off	7.3±2.1 (7.6)	6.0±2.9 (5.6)	2.3±0.1 (2.3)	3.2±2.9 (2.3)	8.5±14.7 (2.5)	19.5±54.3 (2.9)	12.8±4.5 (13.2)
HOMES IN TRAFFIC- IMPACTED LOCATIONS N = 48	HEPA Filter On	4.7±2.8 (4.3)	6.1±2.0 (5.9)	2.1±0.2 (2.1)	2.4±0.2 (2.3)	9.4±17.1 (1.4)	8.4±15.3 (3.3)	12.5±5.0 (13.5)
HOMES IN WOODSMOKE- IMPACTED LOCATIONS N = 20	HEPA Filter Off	6.5±2.7 (6.7)	5.0±2.5 (4.8)	2.2±0.4 (2.0)	2.9±2.3 (2.1)	29.3±67.1 (3.9)	13.2±13.5 (4.6)	5.6±2.5 (5.7)
HOMES IN WOODSMOKE- IMPACTED LOCATIONS N = 20	HEPA Filter On	3.4±1.9 (2.5)	3.9±2.1 (4.0)	1.9±0.1 (2.0)	2.2±0.3 (2.1)	11.8±14.4 (5.0)	20.6±19.9 (15.1)	5.6±2.1 (5.2)