| 元音 | PD组(n = 38) | APS组(n = 35) | Z值 | P值 |
| /i/ | 73 (70, 75) | 72 (69, 75) | −0.534 | 0.593 |
| /u/ | 73 (70, 76) | 72 (69, 74) | −1.089 | 0.276 |
| /v/ | 73 (70, 76) | 71 (69, 74) | −1.675 | 0.094 |
| /o/ | 75 (73, 78) | 74 (71, 77) | −1.109 | 0.267 |
| /e/ | 75 (72, 78) | 74 (70, 76) | −1.206 | 0.228 |
| /a/ | 74 (72, 78) | 73 (70, 76) | −1.204 | 0.229 |
| /s/ | 72 (69, 75) | 71 (69, 74) | −0.501 | 0.616 |
| /zh/ | 73 (70, 76) | 71 (70, 74) | −1.241 | 0.215 |
| /er/ | 74 (70, 77) | 73 (70, 75) | −1.257 | 0.209 |