Graduate School of Public Health, Yonsei University.
J Occup Health. 2014;55(5):385-91. doi: 10.1539/joh.12-0245-oa. Epub 2013 Aug 31.
Long working hours can negatively impact a worker's health. The objective of this study was to examine the association between working hours and cardiovascular diseases (CVDs) and compare the degree of risk based on CVD subtypes in Korean workers.
This study was a case-control study of the patients registered in the Occupational Cardiovascular Diseases Surveillance 2010. The cases included 348 patients diagnosed with a CVD (123 cerebral infarction, 69 intracerebral hemorrhage, 57 subarachnoid hemorrhage, 99 acute myocardial infarction). Controls were 769 participants with no history of CVDs matched for gender, age, type of occupation, and region. Participants' working hours in the previous week and the average working hours over the past three months were assessed to examine short-term and long-term effects.
After adjusting for confounding factors, the odds ratios (ORs) for CVDs in the short-term were 2.66 (95% Confidence interval (CI) :1.78-3.99) for working ≤40 hours, 1.85 (95% CI: 1.22-2.81) for working 50.1-60 hours and 4.23 (95% CI: 2.81-6.39) for working >60 hours compared with the 40.1-50-hour working group. The ORs in the long-term were 2.90 (95% CI: 1.86-4.52) for working ≤40 hours, 1.73 (95% CI: 1.03-2.90) for working 48.1-52 hours and 3.46 (95% CI: 2.38-5.03) for working >52 hours compared with the 40.1-48-hour working group.
Long working hours are related to an increased risk of CVDs, and the degree of risk differs based on CVD subtype. Short working hours are also related to an increased risk for CVDs. More prospective studies targeting specific disease risks are required.
长时间工作会对工人的健康产生负面影响。本研究的目的是检验工作时间与心血管疾病（CVDs）之间的关联，并比较韩国工人中基于 CVD 亚型的风险程度。
本研究是对 2010 年职业心血管疾病监测中登记的患者进行的病例对照研究。病例包括 348 例 CVD 患者（123 例脑梗死，69 例脑出血，57 例蛛网膜下腔出血，99 例急性心肌梗死）。对照组为 769 名无 CVD 史的参与者，按性别、年龄、职业类型和地区匹配。评估参与者上周的工作时间和过去三个月的平均工作时间，以检验短期和长期影响。
在调整了混杂因素后，短期工作与 CVD 的比值比（OR）为工作时间≤40 小时为 2.66（95%置信区间（CI）：1.78-3.99），工作时间 50.1-60 小时为 1.85（95% CI：1.22-2.81），工作时间>60 小时为 4.23（95% CI：2.81-6.39），与 40.1-50 小时工作组相比。长期工作与 CVD 的 OR 为工作时间≤40 小时为 2.90（95% CI：1.86-4.52），工作时间 48.1-52 小时为 1.73（95% CI：1.03-2.90），工作时间>52 小时为 3.46（95% CI：2.38-5.03），与 40.1-48 小时工作组相比。
长时间工作与 CVD 风险增加有关，且风险程度因 CVD 亚型而异。短时间工作也与 CVD 风险增加有关。需要更多针对特定疾病风险的前瞻性研究。
