9年级的时候从高中辍学，1943年应征入伍前默多克在一家加油站工作。

After leaving high school in ninth grade, Murdock worked at a gas station before being drafted into the Army in 1943.

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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.

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