Migration of participants in demographic and epidemiological studies results in missing data. One approach to reduce resulting losses in statistical power and potential biases is to follow up migrants at their new residence. We describe the follow-up of migrants who were eligible for participation in a trial of a new questionnaire to measure adult mortality in Niakhar, Senegal. We conducted a short inquiry in the migrant’s last known household to obtain contact information and then attempted to contact and interview 661 migrants who resided in Dakar, Mbour, and rural areas close to Niakhar. About two-thirds of migrants were successfully enrolled in the study. Having a contact phone number and knowing the name of the head of compound at destination increased the likelihood of successful enrollment. Following up migrants in demographic studies is feasible in low- and middle-income countries, including long-term migrants who have not been contacted for extended periods of time.

中文翻译：

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追踪参与人口和流行病学研究的长期和短期移民：来自塞内加尔的证据

人口和流行病学研究中参与者的迁移导致数据缺失。减少由此造成的统计能力损失和潜在偏差的一种方法是在新住所跟踪移民。我们描述了有资格参与一项新问卷试验的移民的后续行动，该问卷旨在衡量塞内加尔尼亚哈尔的成人死亡率。我们对移民的最后一个已知家庭进行了简短调查，以获取联系信息，然后尝试联系和采访居住在达喀尔、姆布尔和尼亚哈尔附近农村地区的 661 名移民。大约三分之二的移民成功参加了这项研究。拥有联系电话号码并知道目的地大院负责人的姓名会增加成功注册的可能性。