Table 4

Cross-sectional association between directly measured SHS exposure and COPD-related health status (n = 77).

SHS exposure

COPD severity

Physical health status (SF-12)

Disease-specific QOL

Dyspnea

Bivariate

Multivariate

Bivariate

Multivariate

Bivariate

Multivariate

Bivariate

Multivariate

Urine cotinine

1^st tertile

Referent

Referent

Referent

Referent

Referent

Referent

Referent

Referent

2^nd tertile

1.2 (-2.5 to 4.8)

0.2 (-3.6 to 3.9)

-2.3 (-8.9 to 4.2)

0.4 (-5.6 to 6.5)

-0.4 (-3.2 to 2.4)

-0.7 (-3.5 to 2.0)

-0.1 (-0.7 to 0.6)

-0.3 (-0.9 to 0.3)

3^rd tertile

5.4 (1.4 to 9.3)

4.7 (0.6 to 8.9)

-7.8 (-14.9 to -0.7)

-5.6 (-12 to 1.0)

2.9 (-0.16 to 6.0)

2.3 (-0.7 to 5.4)

1.1 (0.5 to 1.8)

1.0 (0.4 to 1.7)

Nicotine badge

1^st tertile

Referent

Referent

Referent

Referent

Referent

Referent

Referent

Referent

2^nd tertile

0.2 (-3.6 to 3.9)

0.6 (-3.2 to 4.4)

3.0 (-3.7 to 9.8)

2.7 (-3.4 to 8.8)

-1.6 (-4.5 to 1.4)

-1.7 (-4.6 to 1.2)

-0.2 (-0.8 to 0.5)

-0.2 (-0.8 to 0.4)

3^rd tertile

-1.4 (-5.3 to 2.5)

-1.1 (-5.0 to 2.8)

3.2 (-3.8 to 10.1)

1.9 (-4.3 to 8.2)

-2.1 (-5.1 to 0.9)

-1.6 (-4.5 to 1.3)

-0.2 (-0.9 to 0.5)

-0.1 (-0.7 to 0.5)

All values are mean score change compared to lowest exposure tertile (referent group) and 95% confidence interval. Multivariate analysis controls for age, sex, race, educational attainment, and past smoking history. Physical health status was measured by the SF-12 physical component summary score; Disease-specific QOL was measured by the Airways Questionnaire 20 (AQ-20); Dyspnea was measured by the modified MRC Dyspnea Scale. Higher scores = worse status, except for SF-12 physical score. Boldface = p < 0.05.

Eisner et al. BMC Pulmonary Medicine 2006 6:12   doi:10.1186/1471-2466-6-12