| RTT | Rett syndrome |
| RSBQ | Rett Syndrome Behavior Questionnaire |
| K-RSBQ | Korean version of the Rett Syndrome Behavior Questionnaire |
| CARS | Childhood Autism Rating Scale |
| MECP2 | Methyl CpG-binding protein 2 gene |
| IRB | Institutional Review Board |
| SD | Standard deviation |
| IQR | Interquartile range |
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