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A key assumption of permutation tests is exchangeability and therefore, we permuted the exposure conditional on the subject (e.g., exposure was permuted on the HBEC values from a single donor, not across donors) and kept the numbers of permuted observations under each condition the same as the observed results

The proportion of deaths attributed to smoking among Chinese men aged 40-79 has doubled from about 10% in the early 1990s to 20% today, said the researchers

It said Tuesday that it is now awaiting final court approval of the deal, which it expects to close by the end of June.