Average not including zero values of fluoride concentrations of ground-water in primary and secondary schools in five areas of Laos
| Vientiane | Luang Prabang | Luang Namtha | Savannakhet | Pakse | Overall | |
|---|---|---|---|---|---|---|
| Urban-primary | 0.050 | 0.050 | 0.060 | 0.160 | 0.090 | |
| Urban-secondary | - | 0.020 | 0.020 | 0.030 | 0.220 | |
| Rural-primary | - | 0.030 | 0.100 | 0.010 | 0.410 | |
| Rural-secondary | - | 0.010 | 0.130 | - | 0.110 | |
| Mean±standard deviation | 0.050 | 0.028±0.017 | 0.078±0.048 | 0.067±0.081 | 0.208±0.147 | 0.089±0.103 |
