A case-control study of risk factors for unintentional non-fatal injuries on the job

C. Y. Li, K. R. Chen, C. H. Wu, F. C. Sung

Research output: Contribution to journalArticlepeer-review


To investigate associations between occupational non-fatal injury and work history and condition, lifestyle and perceived health status among petrochemical workers. Methods: We used a case-control design. Cases were 433 workers with non-fatal injury between 1991 and 1997 while controls were 954 workers without any injury during the same period. Controls were randomly selected with frequency matching to cases on age, sex and work site. Self-administered questionnaires were used to collect information on various potential risk factors of injury. Adjusted relative risk was estimated using a multivariate logistic regression model. Results: After adjustment for potential confounders, an elevated risk of occupational non-fatal injury was found for those who had worked for over 5.5 days a week (odds ratio [OR]=2.2, 95% confidence interval [CI]=1.1-4.7) and those who had night shift work (OR= 1.2, 95% CI=1.1-1.5). Multivariate analysis also revealed significantly inverse relationships between the risk of injury and factors including consumption of alcohol, tea or coffee, routine exercise, perceived visual or hearing impairment, and clinic visits. A significant reverse dose-response trend was noted between injury and self-rated health conditions. Employees with the poorest self-reported health (lowest quartile) were less likely than those in the first quartile to have injury (OR=0.3, 95% CI=0.2-0.6). Conclusions: Our study suggests overtime workers and night shift workers are major subjects for receiving preventive measures of occupational injuries. The potential selection bias due to exclusion of the retired cases from analyses and the possible recall bias were two methodological drawbacks that might have affected the study results.

Original languageEnglish
Pages (from-to)261-271
Number of pages11
JournalChinese Journal of Public Health
Issue number4
Publication statusPublished - 2000

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health


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