International Journal of Epidemiology, Vol 28, 179-188, Copyright © 1999 by International Epidemiological Association
D Smith
BACKGROUND: Concern over human breast milk contamination with the pesticide
DDT (1,1,1-trichloro-2,2-bis(chlorodiphenyl)ethane) has prompted numerous
studies around the world during the last five decades. This article
examines trends in reported DDT levels, and the apparent effect of
restrictions on DDT use. METHODS: More than 130 published values for DDT in
human milk since 1951 were compiled, and trend lines were fit for regions
of the world. RESULTS: Population means have declined in much of the world,
from 5000-10000 microg DDT/kg milk fat to around 1000 today in many areas.
Although different regions have different means, the decline seen in
various countries corresponds to their restricting DDT use. DISCUSSION: DDT
concentrations in human milk have declined in most areas of the world,
consistent with restrictions on its use. Nevertheless, levels can be high
in areas still using DDT, even higher than the World Health Organization's
recommended limit for infants. These results indicate that population
averages can be reduced by a predictable amount as DDT use is restricted.
ARTICLES
Worldwide trends in DDT levels in human breast milk
Environmental Health Investigations Branch, California Department of Health Services, Oakland 94612-1404, USA.
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