Table 3 Fluoride content of raw water samples collected from Gihaya Island, Rwanda (2018, 2019)
From: Dental fluorosis among people and livestock living on Gihaya Island in Lake Kivu, Rwanda
| Â | Fluoride content (mg/L) | ||||
|---|---|---|---|---|---|
Sample | 1st test | 2nd test | 3rd test | Mean | SD |
December 2018 | |||||
 LK | 1.79 | 1.73 | 1.73 | 1.75 | 0.3 |
 SP | 0.14 | 0.13 | 0.12 | 0.13 | 0.1 |
 HPRW | 2.36 × 10–3 | 1.96 × 10–3 | 1.33 × 10–3 | 1.88 × 10–3 | 5.19 × 10–4 |
July 2019 | |||||
 LK 1 | 1.63 | 1.64 | 1.64 | 1.64 | 0.006 |
 LK 2 | 1.63 | 1.65 | 1.64 | 1.64 | 0.01 |
 LK 3 | 1.65 | 1.67 | 1.67 | 1.71 | 0.01 |
 LK 4 | 1.64 | 1.64 | 1.65 | 1.64 | 0.006 |
 LK 5 | 1.64 | 1.64 | 1.64 | 1.64 | 0 |
 LK 6 | 1.74 | 1.70 | 1.70 | 1.71 | 0.02 |
 SP | 0.13 | 0.14 | 0.12 | 0.13 | 0.004 |
 HPRW | 0.03 | 0.02 | 0.02 | 0.02 | 0.006 |