臨場實務-職場過負荷

長時間工作導致腦中風及增加冠狀動脈心臟病風險

2015發表於THE LANCET的一篇研究，結論如下：
『相較於週工時35-40小時族群，長時間工作(每週工作時數≧55小時，月加班時數約≧60小時)。腦中風相對風險增加33%，冠狀動脈心臟病相對風險增加13%。 』

每週工作時數≧55小時，月工時約≧ 55 x 4 + 8 x 2 = 236小時，月加班時數約≧ 236 - 176= 60小時。

『長時間工作導致腦中風增加的風險大於導致冠狀動脈心臟病增加的風險。』
『腦中風的風險和每週工作時數成正比，風險隨著每週工時增加而上升。』
 

[註：每週工作時數H小時，月工時約：H x 4 + 8 x 2 = (4H+16)小時，月加班時數約(4H+16) – 176 = 4H - 160小時』
『缺乏活動(physical inactivity)、長時間久坐和大量飲酒增加腦中風機率』

www.thelancet.com Vol 386 October 31, 2015
Exposure to long working hours was based on self-report and was measured only once. In two studies, high loss to follow-up could also have contributed to an underestimation of associations, although this bias seemed to be small or absent in the total data.
We had harmonised data for multivariable adjustments for age, sex, SES, smoking, BMI, physical activity, and alcohol consumption, but not for salt intake and blood-based risk factors. Ascertainment of coronary heart disease and stroke varied, ranging from medical records of brain imaging and autopsy to repeated self-report questionnaires outcome misclassification is possible. However, the absence of heterogeneity in the study-specific estimates, and the uniform findings in the analyses stratified by method of ascertainment, suggest that this misclassification is not a major source of bias.

www.thelancet.com Vol 386 October 31, 2015