Objective: To investigate the association between oxygen saturation (SpO2) and risk of 3-year all-cause mortality among Chinese older adults aged 65 or over. Methods: The participants were enrolled from Healthy Aging and Biomarkers Cohort Study in year of 2012 to 2014 in 9 longevity areas in China. In this prospective cohort study, 2 287 participants aged 65 or over were enrolled. Data on SpO2 and body measurements were collected at baseline in 2012, and data on survival outcome and time of mortality were collected at the follow-up in 2014. Participants were divided into two groups according to whether SpO2 was abnormal (SpO2<94% was defined as abnormal). Results: The 2 287 participants were (86.5±12.2) years old, 1 006 were males (44.0%), and 315 (13.8%) were abnormal in SpO2. During follow-up in 2014, 452 were died, 1 434 were survived, and 401 were lost to follow-up. The all-cause mortality rate was 19.8%, and the follow-up rate was 82.5%. The mortality rate of SpO2 in normal group was 21.1%, and that of abnormal group was 41.6% (P<0.001). After adjusting for confounding factors, compared to participants with normal SpO2, participants with abnormal SpO2 had increased risk of all-cause mortality with HR (95%CI) of 1.62 (1.31-2.02); HR (95 % CI) was 1.49 (0.98-2.26) for males and 1.71 (1.30-2.26) for females in abnormal SpO2 group, respectively; HR (95%CI) was 2.70 (0.98-7.44) for aged 65-79 years old, 1.22 (0.63-2.38) for aged 80-89 years old, and 1.72 (1.35-2.19) for aged over 90 years old in abnormal SpO2 group, respectively. Conclusion: Abnormal SpO2 was responsible for increased risk of 3-year all-cause mortality among Chinese elderly adults.
目的： 探讨65岁及以上人群血氧饱和度（SpO2）与3年全死因死亡风险的关系。 方法： 研究对象来自2012—2014年在我国9个长寿地区开展的“老年健康生物标志物队列研究”，基于前瞻性队列研究，将2 287名65岁及以上老年人群纳入研究。在2012年基线时收集调查对象SpO2、身体测量指标等数据，2014年随访时收集生存结局和死亡时间等数据。根据调查对象SpO2是否异常（SpO2<94%定义为异常）将其分为2组，采用Cox比例风险回归模型分析SpO2对死亡风险的影响。 结果： 2 287名研究对象年龄为（86.5±12.2）岁，男性1 006名（44.0%）；SpO2异常者315例（13.8%）。2014年随访时，452例死亡，1 434例存活，401例失访，全死因死亡率为19.8%，随访率为82.5%。调整相关混杂因素后，与SpO2正常组相比，异常组死亡风险升高，HR（95%CI）为1.62（1.31~2.02）；其中异常组男性死亡风险HR（95%CI）为1.49（0.98~2.26），女性为1.71（1.30~2.26）；65~79、80~89、90岁及以上人群死亡风险HR（95%CI）分别为2.70（0.98~7.44）、1.22（0.63~2.38）、1.72（1.35~2.19）。 结论： SpO2异常可增加我国长寿地区老年人3年死亡风险。.
Keywords: Aged; Cohort studies; Longevity; Mortality risk; Oxygen saturation.