Disparities in Children’s Blood Lead and Mercury Levels According to Community and Individual Socioeconomic Positions

Sinye Lim, Mina Ha, Seung-Sik Hwang, Mia Son and Ho-Jang Kwon
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Sinye Lim: Department of Occupational and Environmental Medicine, Kyung Hee University Hospital, 23 Kyungheedae-Ro, Dongdaemun-Gu, Seoul 130-872, Korea
Mina Ha: Department of Preventive Medicine, Dankook University College of Medicine, 119 Dandae-Ro, Dongnam-Gu, Cheonan, Chungnam 330-714, Korea
Seung-Sik Hwang: Department of Social Medicine, Inha University School of Medicine, 366 Seohae-Daero, Jung-Gu, Incheon 400-712, Korea
Mia Son: Department of Preventive Medicine, Kangwon National University School of Medicine, 1, Gangwondaehak-Gil, Chuncheon, Gangwon 200-701, Korea
Ho-Jang Kwon: Department of Preventive Medicine, Dankook University College of Medicine, 119 Dandae-Ro, Dongnam-Gu, Cheonan, Chungnam 330-714, Korea

IJERPH, 2015, vol. 12, issue 6, 1-17

Abstract: We aimed to examine the associations between blood lead and mercury levels and individual and community level socioeconomic positions (SEPs) in school-aged children. A longitudinal cohort study was performed in 33 elementary schools in 10 cities in Korea. Among a total of 6094 children included at baseline, the final study population, 2281 children followed-up biennially, were analyzed. The geometric mean (GM) levels of blood lead were 1.73 ?g/dL (range 0.02–9.26) and 1.56 ?g/dL (range 0.02–6.83) for male and female children, respectively. The blood lead levels were significantly higher in males, children living in rural areas, and those with lower individual SEP. The GM levels of blood mercury were 2.07 ?g/L (range 0.09–12.67) and 2.06 ?g/L (range 0.03–11.74) for males and females, respectively. Increased blood mercury levels were significantly associated with urban areas, higher individual SEP, and more deprived communities. The risk of high blood lead level was significantly higher for the lower individual SEP (odds ratio (OR) 2.18, 95% confidence interval (CI) 1.36–3.50 in the lowest educational attainment of the father), with a significant dose-response relationship observed after adjusting for the community SEP. The association between high blood lead levels and lower individual SEP was much stronger in the more deprived communities (OR 2.88, 95% CI 1.27–6.53) than in the less deprived communities (OR 1.40, 95% CI 0.76–2.59), and showed a significant decreasing trend during the follow-up only in the less deprived communities. The risk of high blood mercury levels was higher in higher individual SEP (OR 0.64, 95% CI 0.40–1.03 in the lowest educational attainment of the father), with a significant dose-response relationship noted. Significant decreasing trends were observed during the follow-up both in the less and more deprived communities. From a public health point-of-view, community level intervention with different approaches for different metals is warranted to protect children from environmental exposure.

Keywords: socioeconomic position; children; blood lead; blood mercury; community intervention (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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