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Main stages of the Niakhar HDSS
| Observation period | Location | Number of villages | Population |
|---|---|---|---|
| December 1962 – February 1969 | Niakhar | 65 | 35 187 |
| Paos-Koto | 135 | 18 988 | |
| March 1969 – February 1983 | Ngayokhem | 8 | 4300 |
| Ndemen | 30 | 6000 | |
| March 1983 – Present | Niakhar | 30 | 23 000 (1983) |
| 43 000 (2012) |
