| Study | Reason for exclusion |
|---|---|
| Belokurov 1988 | Not a comparative trial. |
| Gossett 2010 | Not a comparative trial. |
| Helms 2011 | A plan for a potential future trial. |
| Lin 2008 | Not a trial of acute head injury (average delay 27.5 days). |
| Ren 2001b | No additional data presented ‐ same study as Ren 2001a. |
| Rockswold 1985 | Preliminary results only. No data presented that were additional to the full report. |
| Shi 2003 | Included only patients at least 3 months after head injury. |
| Shi 2006 | Included only patients with chronic head injury. |
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