Panafrican University, Life and Earth Sciences Institute (Including Health and Agriculture), University of Ibadan, PMB 5017, GPO, Ibadan, Nigeria.
Ecole Nationale de la Statistique, de la Planification et de la Démographie, Université de Parakou, Route de l'Okpara, B.P. 123, Parakou, Bénin.
BMC Pregnancy Childbirth. 2019 Oct 23;19(1):375. doi: 10.1186/s12884-019-2529-7.
The literature on migration-fertility relationship uses various measures of fertility, such as fertility rates, actual fertility and family size preferences. This study introduces a different measure-interbirth intervals over women's reproductive years-to examine how internal migration is associated with short interbirth intervals (less than 24 months) and long interbirth intervals (greater than 60 months) in Cotonou, the largest city of Benin Republic.
The paper uses primary data on 2852 live births to 1659 women aged 15-49 years from the 2018 Fertility and Migration Survey in Cotonou. Competing-risks models were fitted for the analysis.
Nineteen percent of live births were of short interbirth intervals and 16% were of long interbirth intervals. The prevalence of short interbirth intervals was higher among migrants who spent less than 5 years in Cotonou (29%) than among non-migrants (19%) and earlier migrants (18%). Non-migrants had the highest proportion of long interbirth intervals (19%). Within the first 5 years following the migration to Cotonou, migrants had higher subhazard ratio (SHR) of short interbirth intervals (SHR: 1.71, 95% CI: 1.33-2.21) and lower SHR of long interbirth intervals (SHR: 0.64, 95% CI: 0.47-0.87) than non-migrants. This association holds after controlling for socioeconomic characteristics-but with a slightly reduced gap between migrants who spent less than 5 years in Cotonou and non-migrants. Afterwards and irrespective of women's socioeconomic backgrounds, migrants who spent 5 or more years in Cotonou and non-migrants had similar risks of short and long interbirth intervals. Finally, from 5 years of stay in Cotonou, migrants for reasons other than school or job were less likely to experience short interbirth intervals (SHR: 0.65, 95% CI: 0.46-0.98 for migrants who spent 5-10 years in Cotonou, and SHR: 0.74, 95% CI: 0.54-1.02 for migrants who spent more than 10 years in Cotonou) than non-migrants.
Family planning programmes should mainly target migrants in the early years after their arrival in Cotonou. Moreover, non-migrants need to be sensitised on the adverse health outcomes of long interbirth intervals.
关于移民与生育关系的文献使用了各种生育指标，如生育率、实际生育率和家庭规模偏好。本研究引入了一种不同的衡量标准——生育间隔，以检验科托努的内部迁移与生育间隔过短（小于 24 个月）和过长（大于 60 个月）之间的关系，科托努是贝宁共和国最大的城市。
该论文使用了 2018 年科托努生育与迁移调查中 1659 名 15-49 岁妇女的 2852 例活产数据。采用竞争风险模型进行分析。
19%的活产为生育间隔过短，16%的活产为生育间隔过长。在科托努居住不到 5 年的移民中，生育间隔过短的比例（29%）高于非移民（19%）和早期移民（18%）。非移民的生育间隔过长比例最高（19%）。在移民到科托努后的头 5 年内，移民生育间隔过短的亚危险比（SHR）较高（SHR：1.71，95%CI：1.33-2.21），生育间隔过长的 SHR 较低（SHR：0.64，95%CI：0.47-0.87），而非移民。在控制了社会经济特征后，这种关联仍然存在，但在科托努居住不到 5 年的移民和非移民之间的差距略有缩小。之后，无论妇女的社会经济背景如何，在科托努居住 5 年或以上的移民和非移民生育短间隔和长间隔的风险相似。最后，从在科托努居住 5 年开始，出于上学或工作以外的原因移民的生育间隔过短的可能性较低（SHR：0.65，95%CI：0.46-0.98 为在科托努居住 5-10 年的移民，SHR：0.74，95%CI：0.54-1.02 为在科托努居住超过 10 年的移民）而非非移民。
计划生育方案应主要针对移民抵达科托努后的头几年。此外，需要提高非移民对过长生育间隔不良健康后果的认识。
