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*7727.1 ± 38.26776.0 ± 88.1<0.0001
Indirect7747.5 ± 51.76667.5 ± 68.60.06
Direct (mother only)7713.1 ± 16.16733.0 ± 37.0<0.003
Total cigarettes/wk (mother only)7792.4 ± 63.967105 ± 52.20.09
  • * 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.