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首页> 外文期刊>Annals of epidemiology >Selection bias due to differential participation in a case-control study of mobile phone use and brain tumors.
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Selection bias due to differential participation in a case-control study of mobile phone use and brain tumors.

机译：在手机使用和脑瘤的病例对照研究中，由于差异参与而导致选择偏见。

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PURPOSE: To evaluate the possible selection bias related to the differential participation of mobile phone users and non-users in a Finnish case-control study on mobile phone use and brain tumors. METHODS: Mobile phone use was investigated among 777 controls and 726 cases participating in the full personal interview (full participants), and 321 controls and 103 cases giving only a brief phone interview (incomplete participants). To assess selection bias, the Mantel-Haenszel estimate of odds ratio was calculated for three different groups: full study participants, incomplete participants, and a combined group consisting of both full and incomplete participants. RESULTS: Among controls, 83% of the full participants and 73% of the incomplete participants had regularly used a mobile phone. Among cases, the figures were 76% and 64%, respectively. The odds ratio for brain tumor based on the combined group of full and incomplete participants was slightly closer to unity than that based only on the full participants. CONCLUSIONS: Selection bias tends to distort the effect estimates below unity, while analyses based on more comprehensive material gave results close to unity.
机译：目的：在与手机使用和脑瘤有关的芬兰病例对照研究中，评估与手机用户和非用户差异参与有关的可能选择偏见。方法：调查了777名对照组和726名参加全部个人访谈的参与者（全部参与者），321名对照组和103名仅进行了简短电话访谈的参与者（未完成参与者）的手机使用情况。为了评估选择偏倚，对三个不同的组计算了Mantel-Haenszel的比值比估计：完全研究参与者，不完全参与者以及包括完全和不完全参与者的组合组。结果：在对照组中，有83％的完全参与者和73％的不完全参与者定期使用手机。在这些案例中，数字分别为76％和64％。与仅基于完全参与者的情况相比，基于完全参与者和不完全参与者的组合组的脑肿瘤的优势比稍微接近于统一。结论：选择偏差倾向于使效果估计值低于统一，而基于更全面材料的分析得出的结果接近统一。

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