Concentration of As, Cd, Hg, and Pb in maternal blood collected from women residing in selected North Carolina counties – reported as the geometric mean.

Abbreviations: NA not available; NHANES: Geometric mean levels (2003–2004) reported for women (n = 4,241) participating in NHANES IV [35].aConcentration reported as the geometric mean blood levels collected from women in the third trimester of pregnancy.*Units of Pb are expressed in µg/dL.AArsenic levels in County C were significantly elevated compared individually to County A (Scheffe's pBCadmium levels in County A were significantly elevated compared individually to County B, D, and E (Scheffe's pCMercury levels in County F were significantly elevated compared individually to County A, B, and C (Scheffe's pDLead levels in County C were significantly elevated compared individually to County A, E, and F (Scheffe's p

缩写说明：NA（Not Available，不适用）；NHANES（美国国家健康与营养检查调查，National Health and Nutrition Examination Survey）：针对参与第四轮NHANES（NHANES IV）的女性受试者（n=4241）报告的2003-2004年几何平均水平[35]。
a 注：该浓度以妊娠晚期女性的全血几何平均水平进行报告。
* 铅（Pb）的单位为微克每分升（µg/dL）。
A C县的砷水平显著高于A县（谢弗（Scheffe）检验p值）
B A县的镉水平显著高于B、D、E县（谢弗（Scheffe）检验p值）
C F县的汞水平显著高于A、B、C县（谢弗（Scheffe）检验p值）
D C县的铅水平显著高于A、E、F县（谢弗（Scheffe）检验p值）