Punnett L, Fine L J, Keyserling W M, Herrin G D, Chaffin D B
Center for Ergonomics, University of Michigan, Ann Arbor.
Scand J Work Environ Health. 1991 Oct;17(5):337-46. doi: 10.5271/sjweh.1700.
A case-referent study was conducted in an automobile assembly plant to evaluate the health effect of trunk postures, such as bending and twisting, that deviate from anatomically neutral. Cases of back disorders were all those of workers who reported back pain to the medical department in a ten-month period and met the severity criteria of an interview. The referents were randomly selected workers free of back pain according to medical department records, an interview, and an examination. For each of the final 95 cases and 124 referents, the job was analyzed for postural and lifting requirements with a video recording and software analysis system by analysts blinded to the case/referent status. Back disorders were associated with mild trunk flexion [odds ratio (OR) 4.9, 95% confidence interval (95% CI) 1.4-17.4], severe trunk flexion (OR 5.7, 95% CI 1.6-20.4), and trunk twist or lateral bend (OR 5.9, 95% CI 1.6-21.4). The risk increased with exposure to multiple postures and increasing duration of exposure.
在一家汽车装配厂进行了一项病例对照研究，以评估偏离解剖学中立位的躯干姿势（如弯曲和扭转）对健康的影响。背部疾病病例为在十个月期间向医疗部门报告背痛且符合访谈严重程度标准的所有工人。对照是根据医疗部门记录、访谈和检查随机挑选出的无背痛工人。对于最终的95例病例和124名对照，由对病例/对照状态不知情的分析师使用视频记录和软件分析系统对工作的姿势和搬运要求进行分析。背部疾病与轻度躯干前屈（比值比[OR]4.9，95%置信区间[95%CI]1.4 - 17.4）、重度躯干前屈（OR 5.7，95%CI 1.6 - 20.4）以及躯干扭转或侧弯（OR 5.9，95%CI 1.6 - 21.4）相关。风险随着暴露于多种姿势以及暴露持续时间的增加而增加。
