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Table 2: Prevalence and severity of fluorosis
| Dean’s index of fluorosis prevalence | Severity of fluorosis prevalance | ||||||||||||||||||
| Groups | 0 | 1 | 2 | 3 | 4 | 5 | Total | Mild | Severe | ||||||||||
| I (0.136 ppm) | 90 (92.7) | 2 (2.1) | 5 (5.2) | 0 | 0 | 0 | 97 | 7 (7.3) | 0 | ||||||||||
| II (0.381 ppm) | 42 (42.4) | 13 (13.1) | 13 (13.1) | 23 (23.3) | 7 (7.1) | 1 (1.0) | 99 | 49 (49.5) | 8 (8.1) | ||||||||||
| III (1.36 ppm) | 0 | 0 | 0 | 0 | 27 (29) | 66 (71) | 93 | 0 | 93 (100) | ||||||||||
Numbers in the parentheses indicate percentages
