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Table 6 Proportional change in indoor endotoxin exposures related to predictors (household and subject characteristics) in 12 homes of children with asthma

From: Personal endotoxin exposure in a panel study of school children with asthma

Household and subject characteristics

N or Mean (min-max)

Adjusted coefficient (95% CI)1,2

Dog Ownership

  

   No dogs

4

1.00 (referent)

   One or more dogs

8

0.92 (0.37, 2.31)

Cat Ownership

  

   No cats

9

1.00 (referent)

   One or more cats

3

0.65 (0.26, 1.60)

Number of residents

4.42 (2 - 6)

1.15 (0.74, 1.76)

Carpeting

  

   < 50%

5

1.00 (referent)

   ≥ 50%

7

0.64 (0.31, 1.33)

Age of carpeting

  

   < median years

6

1.00 (referent)

   ≥ median years

6

1.18 (0.55, 2.50)

Flooding damage

  

   No

8

1.00 (referent)

   Yes

4

0.40 (0.24, 0.69)#

Mold/mildew on surfaces

  

   No

2

1.00 (referent)

   Yes

10

0.63 (0.24, 1.66)

Gender

  

   Female

5

1.00 (referent)

   Male

7

1.33 (0.62, 2.87)

Age

  

   13-18 years

6

1.00 (referent)

   9-12 years

6

1.36 (0.61, 3.05)

Race

  

   White non-Hispanic

3

1.00 (referent)

   Hispanic

9

2.35 (1.06, 5.22)**

Mothers education

  

   More than high school

9

1.00 (referent)

   High school or less

3

0.39 (0.21, 0.71)#

Family income

  

   >50,000

8

1.00 (referent)

   Up to $50,000

4

1.24 (0.50, 3.09)

Temperature (°F)

80.0 (67.6 - 92.8)

1.02 (0.98, 1.08)

RH (%)

42.6 (16.7 - 62.1)

1.00 (0.97, 1.03)

  1. * p < 0.10, ** p < 0.05, # p < 0.01
  2. 1Because the dependent variable (indoor endotoxin) was log transformed, we exponentiated the regression coefficient of the predictor, thus yielding the proportional change in endotoxin exposure and 95% confidence interval (CI) and 95% confidence interval (CI).
  3. 2Adjusted for study region.