Origin of Variances in the Oldest-Old: Octogenarian Twins (OCTO-Twin) Wave 5

The OCTO-Twin Study aims to investigate the etiology of individual differences among twin-pairs age 80 and older, on a range of domains including health and functional capacity, cognitive functioning, psychological well-being, personality and personal control. In the study, twin pairs were withdrawn from the Swedish Twin Registry. At the first wave, the twins had to be born 1913 or earlier and both partners in the pair had to accept participation. At baseline in 1991-94, 351 twin pairs (149 monozygotic and 202 like-sex dizygotic pairs) were investigated (mean age: 83.6 years and 67% were female). The two-year longitudinal follow-ups were conducted on all twins who were alive and agreed to participate. Data have been collected at five waves over a total of eight years. In wave 5, 43 twin pairs participated, with a total of 222 individuals. Refer to the description of wave 1/the base line and the individual datasets in the NEAR portal for more details on variable groups and individual variables.OCTO-Twin研究（OCTO-Twin Study）旨在探究80岁及以上双生子对的个体差异的病因学基础，研究覆盖健康与功能能力、认知功能、心理健康水平、人格特质与个人控制感等多个领域。本研究的双生子样本均取自瑞典双生子注册库（Swedish Twin Registry）。在第一波数据收集中，双生子需于1913年及之前出生，且双生子双方均需同意参与研究。1991至1994年的基线调查中，共纳入351对双生子（其中149对同卵双生子（monozygotic pairs）、202对同性别异卵双生子（like-sex dizygotic pairs）），受试者平均年龄为83.6岁，女性占比67%。研究对所有在世且同意参与的双生子开展了两年一次的纵向追踪随访，在总计8年的周期内共完成5波数据采集。在第5波数据收集中，共有43对双生子参与，合计222名受试者。如需获取变量分组与单个变量的更多详细信息，请参阅NEAR门户（NEAR portal）中关于第一波/基线调查及各独立数据集的说明文档。