Occupational history of workers: A detailed record of occupations and their time is helpful to understand the long-term occupational environment in which workers live and its possible impact on health.
Exposure history of occupational hazards: To know whether workers have been exposed to certain occupational hazards, such as dust, noise, chemicals, etc. It is helpful to evaluate their possible impact on workers' health.
Occupational health examination results: Regular health examination of workers and recording the examination results will help to find out the health problems or signs of occupational diseases of workers in time and provide basis for early treatment and intervention.