Table 3 Assessment Results of Children’s Verbal Behavior Development
| Participant | Chronological Age (Years) | Milestone Level(Months) | Overall Level (Months) |
| Motor Imitation | Vocal Imitation | Listener Response | Intraverbal |
| A | 6.8 | 1-M | 0-M | 2-M | 0-M | Level 1 (0-18) |
| B | 6.2 | 10-M | 10-M | 10-M | 9-M | Level 2 (18-30) |
| C | 4.3 | 10-M | 10-M | 10-M | 10-M | Level 2 (18-30) |
Notes. M (Milestone) indicates the number of developmental milestones reached in each verbal behavior domain according to the VB-MAPP Milestones Assessment. The VB-MAPP divides milestones into three levels based on typical developmental age: Level 1 (1-5M, 0-18 months); Level 2 (6-10M, 18-30 months); Level 3 (11-15M, 30-48 months).