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We appreciate Dr Jensen's comments1 on the Central American Survey on Working Conditions and Health (ECCTS)2 and his concern that our sampling methodology may have produced biased results. The ECCTS has broadly followed the methodological criteria of the European Working Condition Survey (EWCS).3 ,4
Of note is that, to estimate prevalence of exposures to different working conditions, the EWCS is applied every 5 years to a representative sample of only 1000 workers in the majority of …
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