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Maternal periconceptional occupational pesticide exposure and neural tube defects.

Authors
Makelarski-JA; Romitti-PA; Rocheleau-CM; Burns-TL; Stewart-PA; Waters-MA; Lawson-CC; Bell-EM; Lin-S; Shaw-GM; Olney-RS; the National Birth Defects Prevention Study
Source
Birth Defects Res A Clin Mol Teratol 2014 Nov; 100(11):877-886
NIOSHTIC No.
20045386
Abstract
Background: Adverse associations between maternal pesticide exposure and neural tube defects (NTDs) have been suggested but not consistently observed. This study used data from the multisite National Birth Defects Prevention Study to examine associations between maternal periconceptional (1 month preconception through 2 months postconception) occupational pesticide exposure and NTDs. Methods: Mothers of 502 NTD cases and 2950 unaffected live-born control infants with estimated delivery dates from 1997 through 2002 were included. Duration, categorical intensity scores, and categorical frequency scores for pesticide classes (e.g., insecticides) were assigned using a modified, literature-based job-exposure matrix and maternal-reported occupational histories. Adjusted odds ratios (aORs) and 95% confidence intervals were estimated based on fitted multivariable logistic regression models that described associations between maternal periconceptional occupational pesticide exposure and NTDs. The aORs were estimated for pesticide exposure (any [yes/no] and cumulative exposure [intensity x frequency x duration] to any pesticide class, each pesticide class, or combination of pesticide classes) and all NTD cases combined and NTD subtypes. Results: Positive, but marginally significant or nonsignificant, aORs were observed for exposure to insecticides + herbicides for all NTD cases combined and for spina bifida alone. Similarly, positive aORs were observed for any exposure and cumulative exposure to insecticides + herbicides + fungicides and anencephaly alone and encephalocele alone. All other aORs were near unity. Conclusion: Pesticide exposure associations varied by NTD subtype and pesticide class. Several aORs were increased, but not significantly. Future work should continue to examine associations between pesticide classes and NTD subtypes using a detailed occupational pesticide exposure assessment and examine pesticide exposures outside the workplace.
Keywords
Reproductive-system; Reproductive-effects; Birth-defects; Women; Pregnancy; Pesticides; Employee-exposure; Occupational-exposure; Children; Analytical-processes; Mathematical-models; Statistical-analysis; Insecticides; Herbicides; Fungicides; Spinal-cord-disorders; Encephalopathy; Teratogenesis; Teratogens; Teratology; Central-nervous-system-disorders; Author Keywords: birth defects; neural tube defects; occupational exposure; pesticides; pregnancy
Contact
Paul A. Romitti, The University of Iowa, S416 CPHB, 145 N Riverside Drive, Iowa City, IA 52242
CODEN
BDRPBT
Publication Date
20141101
Document Type
Journal Article
Email Address
paul-romitti@uiowa.edu
Funding Type
Contract
Fiscal Year
2015
NTIS Accession No.
NTIS Price
Identifying No.
Contract-200-2000-08018; M112014
Issue of Publication
11
ISSN
1542-0752
NIOSH Division
DSHEFS; DART
Priority Area
Manufacturing
Source Name
Birth Defects Research Part A: Clinical and Molecular Teratology
State
IA; OH; VA; NY; CA; GA
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