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Table 3: Mean (± SE) scores for Dean’s index of fluorosis by fluoride concentration in drinking water
| Groups | Number of children | Dean’s index for fluorosis Mean ± SE | |||
| I (0.136 ppm) | 97 | 0.12 ± 0.047a | |||
| II (0.381 ppm) | 99 | 1.42 ± 0.15b | |||
| III (1.36 ppm) | 93 | 4.71 ± 0.047 |
aSignificantly lower than groups II and III (p < 0.001); bsignificantly lower than group III (p < 0.001)
