Table 1.

Blood lead levels (BLLs) and pregnancy status among U.S. women 15–49 years of age by the National Health and Nutrition Examination Survey (NHANES) survey period from 1976 to 2016.

Survey cycle	Years	All women 15–49 years of age ($n$)	Women 15–49 years of age with data available on BLLs		Women 15–49 years of age with data available on BLLs and current pregnancy status
			Total [$n$ (%)]a	BLL $\ge 5\mathrm{\mu }\mathrm{g}/\text{dL}$ [$n$ (%)]b	Total [$n$ (%)]c	Pregnant [$n$ (%)]c
NHANES II	1976–1980	4,892	1,820 (37.2)	1,791 (98.4)	1,146 (63.0)	59 (5.1)
NHANES III	1988–1991	2,993	2,616 (87.4)	268 (10.2)	2,250 (86.1)	154 (6.8)
NHANES III	1991–1994	3,527	3,201 (90.8)	167 (5.2)	2,812 (87.8)	172 (6.1)
NHANES	1999–2002	4,384	3,914 (89.3)	54 (1.4)	3,545 (90.6)	585 (16.5)
NHANES	2003–2006	4,251	3,830 (90.1)	35 (0.9)	3,830 (100.0)	608 (15.9)
NHANES	2007–2010	3,889	3,577 (91.9)	13 (0.4)	2,422 (67.7)	115 (4.7)
NHANES	2011–2016	5,750	3,450 (60.0)	25 (0.7)	2,284 (66.2)	103 (4.5)

Note: BLL, blood lead level; $n$, sample size, where $n$ is the number of participants, not a weighted population estimate.

^aUnweighted percentage of all women 15–49 years of age.

^bUnweighted percentage of women 15–49 years of age with data available on BLL.

^cUnweighted percentage of women 15–49 years of age with data available on BLL and current pregnancy status.