Due to the periodic character of data collection, not only cross-sectional but also longitudinal studies are possible. By increasing the number of processed POHS's, a more detailed system of reference data is being built up. Indicators Most important indicators in this system are health complaints and complaints about the work and the working conditions, registered by means of the standardized questionnaire. The occurrence of such complaints in groups can be considered as indicating problems in work and health. The information products a. and b. are confidential.
Anonymous examples are available.
The number of records in the database now exceeds 150,000. Each record contains over 200 fields concerning health and work items. The information system is considered an important point of reference for the actual state of health and working conditions of the average Dutch employee. The information can be easily combined and is often combined with the more objective work place surveys, although this combination is done by logical integration, and not computer integration. Limitations are the incompleteness of the collected data for specific types of economic activity.