title: DDT exposure, work in agriculture, and time to pregnancy among farmworkers in California.
abstract: OBJECTIVE
  This study examined whether exposure to pesticides, including dichlorodiphenyltrichloroethane (DDT), was associated with longer time to pregnancy (TTP).
  
  
  METHODS
  Pregnant women (N = 402) living in a migrant farmworker community were asked how many months they took to conceive. Women reported their and their partners' occupational and home pesticide exposure preceding conception. In a subset (N = 289), levels of DDT and dichlorodiphenyldichloroethylene (DDE), were measured in maternal serum.
  
  
  RESULTS
  No associations were seen with p, p'-DDT, o, p'-DDT, or p, p'-DDE. Maternal occupational pesticide exposure (fecundability odds ratios [fOR] = 0.8, 95% CI: 0.6 to 1.0), home pesticide use (fOR = 0.6, 95% CI: 0.4 to 0.9), and residence within 200 ft of an agricultural field (fOR = 0.7, 95% CI: 0.5 to 1.0) were associated with reduced fecundability (ie, longer TTP).
  
  
  CONCLUSIONS
  Longer TTP was seen among women, but not men, reporting exposure to agricultural and home pesticides.
authors.affiliation: Center for Children's Environmental Health Research, School of Public Health, University of California, Berkeley, Calif 94704-7380, USA. kharley@berkeley.edu
authors.forename: Kim G
authors.initials: KG
authors.lastname: Harley
authors.forename: Amy R
authors.initials: AR
authors.lastname: Marks
authors.forename: Asa
authors.initials: A
authors.lastname: Bradman
authors.forename: Dana B
authors.initials: DB
authors.lastname: Barr
authors.forename: Brenda
authors.initials: B
authors.lastname: Eskenazi
mesh_terms: D000293:Adolescent; D000328:Adult; D000383:Agriculture; D002140:California; D003634:DDT / Q000009:adverse effects* / Q000097:blood; D003633:Dichlorodiphenyl Dichloroethylene / Q000009:adverse effects* / Q000097:blood; D005260:Female; D005298:Fertility; D006630:Hispanic or Latino; D006801:Humans; D007407:Interviews as Topic; D008137:Longitudinal Studies; D008297:Male; D013058:Mass Spectrometry; D018811:Maternal Exposure / Q000009:adverse effects; D016273:Occupational Exposure / Q000009:adverse effects* / Q000032:analysis; D018812:Paternal Exposure / Q000009:adverse effects; D010575:Pesticides / Q000009:adverse effects* / Q000097:blood; D011247:Pregnancy; D016016:Proportional Hazards Models; D013997:Time Factors; D014171:Transients and Migrants; D055815:Young Adult
chemical_list: D010575:Pesticides; D003633:Dichlorodiphenyl Dichloroethylene; D003634:DDT