Again, the researchers had interviewers administer what resembled a typical survey of a random sample of households. Appropriately, at the end of the article in The Lancet , the authors discuss issues that may have resulted in a sample that in fact did not meet the “random” threshold.
该研究小组在2006年又将调查重新进行了一遍，所不同的是这次调查中选取的样本数量更多。研究人员再次要求调查员进行典型的随机家庭取样。在《柳叶刀》期刊文章的末尾，作者适当地探讨了不满足“随机“条件的样本可能带来的问题。