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Fluorosis levels in the two-age sample (percent in colon).
| Fluorosis (Dean Index) | 5-6-year-old | 12-year-old |
|---|---|---|
| n° (%) | n° (%) | |
| No sign or Uncertain (0) | 28 (45.9) | 33 (54.1) |
| Very mild (1) | 201 (58.6) | 142 (41.4) |
| Mild (2) | 82 (38.5) | 131 (61.5) |
| Moderate or Severe (>2) | 24 (33.3) | 48 (66.7) |
No responders 3 (0.4%).
χ 2 = 29.3 (3) P = .01.
