International Journal of Epidemiology, Vol 26, 643-650, Copyright © 1997 by International Epidemiological Association
DW Kaufman, S Issaragrisil, T Anderson, K Chansung, T Thamprasit, J Sirijirachai, A Piankijagum, Y Porapakkham, S Vannasaeng, PE Leaverton, S Shapiro and NS Young
BACKGROUND: Aplastic anaemia is a severe blood dyscrasia that is more
common in Thailand than in Western countries. Its a etiology remains poorly
understood. METHODS: A case-control study was conducted in Bangkok and two
rural regions of Thailand. The effect of household pesticides was evaluated
among 253 incident cases of aplastic anaemia and 1174 hospital controls.
RESULTS: A total of 54% of the cases and 61% of the controls were exposed
1-6 months previously. For most individual household pesticides and for
groups classified according to chemical type (organophosphates, pyrethrins,
and organochlorines), the relative risk (RR) estimates approximated 1.0;
upper 95% confidence limits were below 2.0 for many comparisons. A
significant association was observed for exposure to combination products
containing dichlorvos and propoxur, with an overall RR estimate of 1.7 (95%
confidence interval [CI]: 1.1-2.6); the estimate for regular use was 1.6
(95% CI: 0.9-2.9). CONCLUSIONS: The absence of a higher risk for the
regular use of dichlorvos/propoxur reduces the credibility of the apparent
association, which could well have been an artefact of multiple
comparisons. We conclude that most household pesticides used in Thailand do
not appear to increase the risk of aplastic anaemia.
ARTICLES
Use of household pesticides and the risk of aplastic anaemia in Thailand. The Aplastic Anemia Study Group
Stone Epidemiology Unit, School of Public Health, Boston University School of Medicine, Brookline, MA, USA.
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S. Issaragrisil, D. W. Kaufman, T. Anderson, K. Chansung, P. E. Leaverton, S. Shapiro, and N. S. Young The epidemiology of aplastic anemia in Thailand Blood, February 15, 2006; 107(4): 1299 - 1307. [Abstract] [Full Text] [PDF] |
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