In many countries, the coverage of reporting requirements or injury compensation, and thus the coverage of the statistics, is limited to certain types of workers such as employees only or insured workers only. If the numerator and denominator derive from different sources, this should be clearly specified. Furthermore metadata should specify (i) whether the data relate to cases of occupational injury which have been reported (to an accident notification system or to an accident compensation scheme), compensated (by an accident insurance scheme) or identified in some other way (for example through a survey of households or establishments) and (ii) whether cases of occupational injury due to commuting accidents are included in the statistics.