Table 2

Distribution of SHS exposure among non-smokers with COPD by self-report and direct exposure monitoring

Measure

N

Proportion with any self-reported exposure or detectable urine/badge level

SHS exposure among those with any exposure


25th %tile

Median

75th %tile


Self-report, past 7 days (hrs)

77

20 (26%)

1

2

7

Urine cotinine (ng/ml)

77

69 (90%)

0.092

0.20

0.81

First tertile*

26

14 (54%)

0

0.054

0.069

Second tertile

26

26 (100%)

0.12

0.16

0.22

Third tertile

25

25 (100%)

0.75

1.54

3.86

Personal nicotine badge (μg/m3)

77

64 (83%)

0.096

0.22

0.63

First tertile*

27

14 (52%)

0

0.023

0.061

Second tertile

24

24 (100%)

0.12

0.14

0.22

Third tertile

26

26 (100%)

0.45

0.86

1.53


*Based on the distribution, urine cotinine and personal badge nicotine levels were divided into tertiles for statistical analysis. Although lowest tertile contained some subjects with detectable values, these were very low values quantitatively.

Among 77 subjects with all three measures available, the Spearman rank correlation between self-reported SHS exposure and urine cotinine was 0.28 (p = 0.013); between self-reported exposure and badge nicotine level was 0.06 (p = 0.57); between urine cotinine and badge nicotine was 0.41 (p = 0.0002). When tertile of urine cotinine and nicotine badge were examined as categories, the Kappa was 0.33 (95% CI 0.16 to 0.50).

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

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