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一份纳入 24 项随机试验的 Cochrane 综述。把食物放得更远,吃掉的量下降,标准化均数差 −0.60(95% CI −0.84 到 −0.36,这是可信范围;12 项研究、1098 人,低确定性证据),属于中等效应。把可选项减少,选择该食物的下降更明显,标准化均数差 −1.13(95% CI −1.90 到 −0.37,3 项研究、154 人,低确定性证据)。回归分析显示:放得越远、可选项越单一,效果越强。
备注
定 B 级的理由:这份综述收进来的 24 项研究全部是食物,酒和烟一项都没有;14 项在实验室做,全部来自高收入国家。所以「挪远就少碰」搬到手机和游戏上属于顺推,没有直接试验。把手机放到视线之外这一件事有人直接测过,见第 3 节第 1 条(关掉非必要通知,工作时把手机放到视线之外)。
来源
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