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Community-based randomized double-blind study of gastrointestinal effects and copper exposure in drinking water

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2004-07
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Araya, Magdalena
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Community-based randomized double-blind study of gastrointestinal effects and copper exposure in drinking water
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Author
  • Araya, Magdalena;
  • Olivares Grohnert, Manuel;
  • Pizarro Aguirre, Fernando;
  • Llanos, Adolfo;
  • Figueroa, Guillermo;
  • Uauy Dagach-Imbarack, Ricardo;
Abstract
We assessed gastrointestinal effects in 1,365 adults exposed to either < 0.01 (controls), 2, 4, or 6 mg copper/L of drinking water for 2 months in a randomized, double-blind community-based study. The risk of symptoms increased with increasing Cu exposure and decreased with time. The best model by counting-process analysis included Cu concentration and sex. The risk of symptoms remained significantly higher in women than in men during weeks 1-4 for all concentrations tested; at week I comparison with the < 0.01-mg/L group showed that differences became significant in women at 4 mg/L [relative risk (RR) = 1.53; 95% confidence interval (CI), 1.02-2.05), and in men at 6 mg/L (RR = 1.9; 95% CI, 1.02-2-79). At week 2 for men and week 4 in women, the Cu concentration required to obtain significant differences on symptom report was > 6 mg Cu/L. We conclude that exposure to Cu in drinking water results in gastrointestinal symptoms, which are modulated by Cu concentration, time, and sex.
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URI: https://repositorio.uchile.cl/handle/2250/123801
ISSN: 0091-6765
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ENVIRONMENTAL HEALTH PERSPECTIVES 112 (10): 1068-1073 JUL 2004
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