Table 1.

Maternal and umbilical cord blood level

Sample	Mean blood lead levels
Maternal blood (n = 200)	ND (n = 81) (40.5%)	(n = 119) (59.5%)			ND-34.8 µg/dL (n = 200)
		0–5 µg/dL (n = 24) (12%)	5–20 µg/dL (n = 86) (43%)	> 20 µg/dL (n = 9) (4.5%)
Mean	ND	4.06	10.73	24.73	10.41
SD	ND	0.64	4.61	5.96	6.36

Umbilical cord blood (n = 200)	ND (n = 86) (43%)	(n = 114) (57%)			ND-45 µg/dL (n = 200)
		0–5 µg/dL (n = 36) (18%)	5–20 µg/dL (n = 65) (32.5%)	> 20 µg/dL (n = 13) (6.5%)
Mean	ND	3.66	11.12	28.36	10.73
SD	ND	0.61	4.24	7.71	8.27

ND Not detected, SD standard deviation