| Study | Reason for exclusion |
|---|---|
| Besag 1995 | No randomisation. |
| Buoni 1999 | No randomisation. |
| Erenberg 1982 | No randomisation. |
| Ferrie 1995 | Retrospective study. |
| Holmes 2008 | No randomisation. |
| Kang 2012 | No patients with absence seizures included. |
| Najad 2009 | No patients with childhood absence seizures included. |
| Santavuori 1983 | Retrospective study. |
| Schlumberger 1994 | No randomisation. |
| Suzuki 1972 | No randomisation. |
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