| Date | Event | Description |
|---|---|---|
| 1 July 2011 | New citation required but conclusions have not changed | new citation because of new search, new studies, background emended |
| 12 May 2011 | New search has been performed | Three additional studies included. Background information, results, discussion and conclusions updated. Changes to findings. |
| 6 November 2008 | New search has been performed | Data added into studies awaiting assessment, track changes accepted, references checked info on results for driving offences added |
| 16 June 2008 | New citation required and conclusions have changed | Substantive amendment |
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