Shiftwork and work injuries in an iron and steel mill.

A study on work injuries that occurred over a five-year period was conducted in an iron and steel mill employing over 1000 workers. Of all the 921 injuries which required more than one day's sick leave, over 40% (383 cases) happened during the morning shift (0700-1500 hours), 210 cases occurred in the afternoon shift (1500-2300 hours) and only 150 cases were reported during the night shift. There were two injury peaks throughout the day, one at mid-morning (between 0900 and 1000 hours) and the other towards the mid-afternoon (1400-1500 hours). It was observed that hand injuries were more common during the morning and afternoon shifts and foot injuries normally occurred at night. 'Fall' was one of the main causes of accidents at night, whereas 'struck by' heavy objects and 'burn' were more common during the day. Although there were more accidents during the morning and afternoon shifts, work injuries which occurred at night generally required a longer duration of sick leave. This suggests that accidents which happened at night were more serious. It is believed that the work habits, shift systems and work environment have a substantial influence on these accidents.