| Data Series | Revision arrangements |
|---|---|
| Annual reported injury statistics (RIDDOR) | At first release, RIDDOR data are marked as provisional. The following year, data are finalised and no further revisions made (unless there is a methodological improvement or errors are found) |
| Annual reported injury rates (RIDDOR) | Since the HSS data release in November 2011 the Annual Population Survey (APS) has been used as the denominator for RIDDOR injury rates (previously, the  Workforce in Employment (WiE) series and the BRES survey were used). As with the previous surveys, the Office for National Statistics (ONS) is the provider of the APS data. The analysis and interpretation of these data are the sole responsibility of the HSE. Revisions typically go back two years and will be incorporated into the RIDDOR injury rates at the time of the next scheduled release of injury numbers. Occasionally, more historical revisions are made to the employment series. When these revisions occur, HSE statisticians will make a judgement as to whether they materially impact on the RIDDOR injury rate series and decide whether to incorporate them into the rates. |
| Mesothelioma deaths | Deaths from Mesothelioma are marked as provisional for two years and will be revised due to late registrations to ensure the series is as complete and consistent as possible. |
| Enforcement data | At first release, enforcement data (notices and prosecutions) are marked as provisional. The following year, data are finalised and no further revisions made. (unless errors are found) |
| Quarterly, in-year reported deaths (RIDDOR) data | This series covers work-related fatalities that are reportable under RIDDOR, and are updated on a quarterly basis. A consequence of providing detail that is as up-to-date as possible is that many of the cases listed are still under investigation. Therefore, these statistics are released on a provisional basis, and the quarterly figures will be revised during the year up until the time that the annual figures are finalised. |
| THOR | THOR records reports of cases of work-related illness from members of the THOR surveillance network. There is a system of regular checks with reporters throughout the year, and an annual process of completeness and logic checks before the data are released. Occasionally, specific analyses can identify data errors in individual THOR cases after initial publication. When found, these are corrected immediately in the THOR database, and at the next annual update in the HSE published tables. |
| LFS | HSE follows LFS revision practice to the extent that it materially affects estimates from the health and safety questions. When there is the potential impact, an assessment of the scale is made and a judgement about the need for revision is made. |
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