结果：踝关节扭伤发生的危险因素为吸烟和入伍前损伤史，OR值为2.00和3.17，保护因素为入伍前体育竞赛史，OR值为0.39。
Results:The risk factors were smoking and previous injury with OR 2.00 and 3.17 respectively. History of match was the protective factor with OR 0.39.
他们为避免被强征入伍而离开了自己的村庄。
They left their villages to evade being press-ganged into the army.
其中两篇试验以入伍新兵为研究对象，而第三篇的研究对象则来自于二次世界大战期间就读于英国某所住宿学校的“低收入户”男童。
Two trials examined military recruits and the third studied boys from "lower wage-earning classes" attending a boarding school in the UK during World War II.
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