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Sample sizes are shown in the following table
| No | Province | Sample size | Notes |
|---|---|---|---|
| 1 | Tay Ninh | 400 | P = 4 % |
| 2 | Ba Ria Vung Tau | 400 | P = 4 % |
| 3 | Dong Nai | 360 | P = 4 % |
| 4 | Ben Tre | 380 | P = 4 % |
| 5 | Dong Thap | 290 | P = 3 % |
| 6 | Hau Giang | 300 | P = 3 % |
| 7 | Vinh Long | 338 | P = 3 % |
| 8 | Soc Trang | 300 | P = 3 % |
| Total | 2768 |
