. Author manuscript; available in PMC: 2015 Sep 1.

Published in final edited form as: Indoor Air. 2013 Apr 18;23(6):498–505. doi: 10.1111/ina.12043

Table 3.

Linear regression results (95% confidence intervals)^a describing the relationship between home characteristics and PM_10–2.5 and airborne endotoxin concentrations N = 50

	PM_10–2.5		EU/m³		EU/mg
	Unadjusted	Adjusted^b	Unadjusted	Adjusted^b	Unadjusted	Adjusted^b
Number of residents	0.98 (0.91, 1.14)	1.03 (0.92, 1.15)	1.16 (0.77, 1.73)	1.33 (0.85, 2.08)	1.11 (0.75, 1.64)	1.26 (0.81, 1.97)
Number of pets	1.22 (1.03, 1.44)^*	1.19 (1.00, 1.42)^*	1.28 (0.69, 2.32)	1.27 (0.64, 2.53)	1.09 (0.59, 2.01)	1.12 (0.56, 2.22)
Times loaded/stoked	1.01 (0.99, 1.04)	1.00 (0.98, 1.02)	1.00 (0.92, 1.10)	0.99 (0.90, 1.09)	0.99 (0.91, 1.07)	0.98 (0.90, 1.08)
Square footage^c	0.92 (0.85, 0.99)^*	0.95 (0.88, 1.04)	0.83 (0.63, 1.10)	0.83 (0.60, 1.16)	0.91 (0.69, 1.20)	0.89 (0.64, 1.23)
Ambient temperature (°F)	1.03 (0.97, 1.08)	1.00 (0.95, 1.06)	1.03 (0.85, 1.24)	1.03 (0.84, 1.26)	1.00 (0.83, 1.19)	1.01 (0.83, 1.24)
Indoor humidity (%rH)	1.02 (0.99, 1.04)	1.01 (.99, 1.04)	0.96 (0.88, 1.05)	0.94 (0.85, 1.04)	0.95 (0.87, 1.03)	0.94 (0.85, 1.03)
DustTrak PM_2.5 (μg/m³)^d	1.03 (1.00, 1.06)^*	1.02 (0.99, 1.05)	1.03 (0.93, 1.14)	1.01 (0.89, 1.14)	1.00 (0.90, 1.10)	0.99 (0.88, 1.12)

All coefficients correspond to one unit increase in predictor variable unless otherwise noted. EU/m³ and EU/mg in PM_10–2.5.

P < 0.05.

Regression results and confidence intervals are reported as percent change in geometric mean PM_10–2.5, EU/m³, or EU/mg. For example, 0.96 (0.91, 1.14) signifies a 4% reduction in geometric mean (95% CI: −9%, 14%).

Analyses adjusted for number of residents, number of pets, times loaded/stoked, square footage, ambient temperature, indoor humidity, and DustTrak PM_2.5.

Results per 500 ft² increase.

Results per 10 μg/m³ increase.