Table 3.

Lead concentration in whole blood in smoking and nonsmoking women in the course of pregnancy

Lead concentration (μg/dL)
Gestational age	Smoking (n = 70)		Nonsmoking (n = 80)		p value
	Median	First and third quartiles	Median	First and third quartiles
I Trimester	1.99	1.23–3.22	1.33	0.84–1.85	<0.001
II Trimester	2.01	1.25–2.46	1.30	0.81–1.69	<0.001
III Trimester	2.01	1.56–3.45	1.35	0.93–2.25	<0.001
Entire pregnancy	2.00	1.36–2.99	1.33	0.85–1.90	<0.001