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Table 3 Subject characteristics associated with exhaled CO and their predictive values in unadjusted and fully adjusted regression analyses

From: Smoking practices in relation to exhaled carbon monoxide in an occupational cohort

Predictor

Bivariate Analyses

Multivariate Analysis

R2

beta

P

beta

P

Age (per 10 years)

0.06

2.07

< 0.001

0.74

< 0.001

Height

0.0008

−0.03

0.43

NA

NA

Urban residence

0.02

−1.56

< 0.001

−0.20

0.52

Exposure to SHS

0.02

2.85

< 0.001

0.49

0.39

Coal use for heating

0.02

1.57

< 0.001

0.36

0.30

Biomass fuel use for cooking

0.004

1.72

0.09

1.38

0.05

Last waterpipe use ≤12 h

0.03

19.72

< 0.001

23.10

< 0.001

Last cigarette ≤12 h

0.50

8.49

< 0.001

8.22

< 0.001

Last fire ≤6 h

0.002

5.19

0.20

4.12

0.12

  1. NA not applicable, SHS secondhand smoke
  2. In the multivariate analysis, the overall R2 = 0.56
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BMC Public Health

ISSN: 1471-2458

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