| Volunteer No. | a_Vowel | i_Vowel | u_Vowel | |||
| F1 | F2 | F1 | F2 | F1 | F2 | |
| 1 | 616 | 1195 | 380 | 1449 | 345 | 980 |
| 2 | 652 | 1280 | 400 | 1599 | 429 | 971 |
| 3 | 465 | 1033 | 337 | 1286 | 341 | 810 |
| 4 | 559 | 1025 | 339 | 689 | 390 | 750 |
| 5 | 465 | 1057 | 262 | 1592 | 347 | 1570 |
| 6 | 586 | 1215 | 393 | 1608 | 388 | 1042 |
| 7 | 528 | 1063 | 381 | 1451 | 360 | 732 |
| 8 | 576 | 1027 | 339 | 1240 | 402 | 1005 |
| 9 | 583 | 1176 | 339 | 1382 | 354 | 810 |
| 10 | 626 | 1066 | 404 | 1406 | 392 | 815 |
| 11 | 529 | 1062 | 404 | 1746 | 371 | 852 |
| 12 | 555 | 1272 | 422 | 1805 | 352 | 858 |
| 13 | 591 | 1155 | 394 | 1250 | 363 | 836 |
| 14 | 623 | 1400 | 373 | 1285 | 376 | 815 |
| 15 | 536 | 1113 | 361 | 1562 | 366 | 1018 |
| 16 | 520 | 1035 | 419 | 1448 | 398 | 787 |
| 17 | 502 | 1351 | 394 | 1769 | 375 | 820 |
| 18 | 559 | 1367 | 320 | 1130 | 350 | 613 |
| 19 | 571 | 736 | 354 | 1192 | 349 | 692 |
| Mean | 560 | 1138 | 369 | 1415 | 371 | 883 |
| Min | 465 | 736 | 262 | 689 | 341 | 613 |
| Max | 652 | 1400 | 422 | 1805 | 429 | 1570 |