| CEN | Clinical Excellence Network |
| CNTNAP-2 | Contactin-associated protein-like 2 |
| DD | Dissociative disorder |
| DSM | Diagnosis and Statistical Manual |
| ICD | International Classification of Diseases |
| IQR | Interquartile range |
| NASEN | National Association for Special Educational Needs |
| NDD | Neurodevelopmental disorder |
| SAD | Social anxiety disorder |
| SD | Standard deviation |
| SM | Selective mutism |
| SMiRA | Selective Mutism Information and Research Association |
| SMQ | Selective Mutism Questionnaire |
| UK | United Kingdom |
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