Abstract:
BACKGROUND:The inconsistent epidemiological results of the endocrine disrupting effects of DDT fuel a harsh debate on its global ban. OBJECTIVES:We tested the hypothesis that occupational exposure to dichloro-diphenyl-trichloroethane (DDT) causes impairment in male fertility in a cohort of DDT exposed workers, in Sardinia, Italy. METHODS:We accessed official records on date of marriage and date of birth of the first child to estimate time to pregnancy (TTP) in the spouses of 1223 workers employed in a 1946-1950 anti-malarial campaign. The TTP calculation was censored at the 13th month after date of marriage. We used a modified Cox's proportional hazard model to calculate the fecundability ratio (FR) by job, by cumulative exposure to DDT, and by time window in relation to the anti-malarial operations, adjusting by paternal age at marriage. RESULTS:Among the spouses of DDT applicators, fecundability did not vary during DDT use (FR=1.22, 95% CI 0.84-1.77) nor in the following decade (FR=1.01, 95% CI 0.67-1.50) with reference to the prior years. A significant increase occurred among the unexposed and the less exposed sub-cohorts, which generated a non-significantly reduced FR among the DDT applicator sub-cohort with reference to the unexposed following exposure. CONCLUSION:We did not find evidence of an impairment in male fertility following heavy occupational exposure to DDT. However, although fecundability was highest among the spouses of the DDT applicators in the years prior to the anti-malarial campaign, we cannot exclude that DDT exposure prevented an increase parallel to that observed among the unexposed and the less exposed sub-cohorts.
journal_name
Environ Intjournal_title
Environment internationalauthors
Campagna M,Satta G,Fadda D,Pili S,Cocco Pdoi
10.1016/j.envint.2015.01.010subject
Has Abstractpub_date
2015-04-01 00:00:00pages
42-7eissn
0160-4120issn
1873-6750pii
S0160-4120(15)00021-5journal_volume
77pub_type
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