American Association for Cancer Research

Table 3.

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

Type of exposure to ETS	NNAL not detected			NNAL detected		P
Type of exposure to ETS		n	No. cigarettes/wk (mean ± SD)	n	No. cigarettes/wk (mean ± SD)	P
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 ETS	NNAL not detected			NNAL detected		P
Type of exposure to ETS		n	No. cigarettes/wk (mean ± SD)	n	No. cigarettes/wk (mean ± SD)	P
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.