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Table 3.

Relationship between reported ETS exposure and NNAL detectability in the urine of infants

Type of exposure to ETSNNAL not detected
NNAL detected
P
nNo. cigarettes/wk (mean ± SD)nNo. cigarettes/wk (mean ± SD)
Direct* 77 27.1 ± 38.2 67 76.0 ± 88.1 <0.0001 
Indirect 77 47.5 ± 51.7 66 67.5 ± 68.6 0.06 
Direct (mother only) 77 13.1 ± 16.1 67 33.0 ± 37.0 <0.003 
Total cigarettes/wk (mother only) 77 92.4 ± 63.9 67 105 ± 52.2 0.09 
Type of exposure to ETSNNAL not detected
NNAL detected
P
nNo. cigarettes/wk (mean ± SD)nNo. cigarettes/wk (mean ± SD)
Direct* 77 27.1 ± 38.2 67 76.0 ± 88.1 <0.0001 
Indirect 77 47.5 ± 51.7 66 67.5 ± 68.6 0.06 
Direct (mother only) 77 13.1 ± 16.1 67 33.0 ± 37.0 <0.003 
Total cigarettes/wk (mother only) 77 92.4 ± 63.9 67 105 ± 52.2 0.09 
*

Number of cigarettes smoked in home or car by any family member when the infant is present.

Number of cigarettes smoked in home or car when the infant is not present.

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