Table 5

A relationship between indoor NO₂ and housing physical structures, Butajira, Ethiopia, 2000-2002 (n = 2882)

Model

Variable

Regression Coefficients

(Beta), (95%CI)

Std. Error

of Beta

t-

statistics

p-value for beta

Model R²

(adjusted)

Standardized

beta

1

Volume

0.104 (0.055,0.153)

0.025

4.16

p < 0.0001

0.006

0.077

2

Volume

0.112 ((0.061,0.162)

0.026

4.35

p < 0.0001

0.006

0.083

Window

-0.018 (-0.046,0.010)

0.014

-1.28

0.202

-0.024

3

Volume

0.102 (0.51,0.152)

0.026

3.93

p < 0.0001

0.008

0.076

Window

-0.022 (-0.05,0.005)

0.014

-1.58

0.115

-0.030

Kitchen

-0.5.3 (-0.89,-0.018)

0.018

-2.94

p < 0.01

-0.055

Condensed

model

Volume

0.093 ((0.043,0.142)

0.025

3.66

p < 0.0001

0.008

0.069

Kitchen

-0.050(-0.085,-0.015)

0.018

-2.79

p < 0.01

-0.052

Kumie et al. Environmental Health 2009 8:51   doi:10.1186/1476-069X-8-51