Cross-sectional

Cross-sectional

1. Variables

   • Effect of valproic acid
   • Thrombocytopenia

2. Patients

   • Ninety-six neurologically impaired children who were treated with valproic acid between 1 July 1991 and 3 June 1999. The comparison group consisted of 48 children receiving antiepileptic drugs other than valproic acid

3. Confusing variables

4. Statistical tests

   • The Statistical Package for Social Science (Windows version 7.5; SPSS Inc., Chicago, United States) was used for the statistical analysis and they used Chi squared test

5. Sample size

   • Ninety-six neurologically impaired children

6. Conflicts of interest

   • None reported

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