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| Buccal phase I | Lingual phase I | Phase II | |||||
| Group* | N | Mean | SD | Mean | SD | Mean | SD |
| Inuit | 10 | 49.7 | 4.1 | 15.5 | 5.0 | 33.4 | 5.4 |
| Vancouver is. | 15 | 47.3 | 3.4 | 16.9 | 9.5 | 32.6 | 9.5 |
| Fuegians | 7 | 47.1 | 2.0 | 13.9 | 6.3 | 30.7 | 8.5 |
| Australians | 3 | 46.7 | 1.1 | 21.3 | 4.5 | 30.0 | 6.2 |
| Khoe-San | 7 | 45.0 | 4.6 | 27.1 | 5.5 | 24.4 | 4.4 |
