Table 3:
Fluorosis prevalence*** on late-erupting teeth by estimated total fluoride intake tertile
| Fluoride intake age ranges |
Subjects | Low | Moderate | High | p-value** | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| n | % fluorosis | n | % fluorosis | RR (95% CI) | n | % fluorosis | RR (95% CI) | ||||
| Canine | 2-5 Years | 269 | 83 | 9.6% | 93 | 16.1% | 1.67 (0.75, 3.74) |
93 | 26.9% | 2.79 * (1.33, 5.84) |
0.0017 |
| 5-8 Years | 269 | 86 | 9.3% | 87 | 13.8% | 1.48 (0.64, 3.45) |
96 | 29.2% | 3.14 * (1.51, 6.51) |
0.0002 | |
| 2-8 Years | 269 | 89 | 6.7% | 86 | 20.9% | 3.10 * (1.29, 7.45) |
94 | 25.5% | 3.79 * (1.62, 8.83) |
0.0006 | |
| 2 Intake Age Ranges Steady + | 167 | 55 | 9.1% | 47 | 17.0% | 1.87 (0.66, 5.34) |
65 | 32.3% | 3.55 * (1.44, 8.80) |
0.0009 | |
| 1st Premolars | 2-5 Years | 301 | 91 | 14.3% | 106 | 18.9% | 1.32 (0.70, 2.50) |
104 | 30.8% | 2.15 * (1.21, 3.85) |
0.0030 |
| 5-8 Years | 301 | 97 | 15.5% | 96 | 22.9% | 1.48 (0.82, 2.68) |
108 | 25.9% | 1.68 (0.95, 2.95) |
0.0426 | |
| 2-8 Years | 301 | 95 | 15.8% | 100 | 21.0% | 1.33 (0.73, 2.42) |
106 | 27.4% | 1.73 (0.99, 3.03) |
0.0280 | |
| 2 Intake Age Ranges Steady + | 183 | 60 | 16.7% | 51 | 23.5% | 1.41 (0.67, 2.99) |
72 | 31.9% | 1.92 (0.99, 3.70) |
0.0261 | |
| 2nd Premolars | 2-5 Years | 280 | 87 | 13.8% | 94 | 19.1% | 1.39 (0.71, 2.71) |
99 | 36.4% | 2.64 * (1.47, 4.74) |
0.0001 |
| 5-8 Years | 280 | 88 | 13.6% | 93 | 23.7% | 1.73 (0.91, 3.29) |
99 | 32.3% | 2.37 * (1.30, 4.31) |
0.0017 | |
| 2-8 Years | 280 | 91 | 13.2% | 89 | 22.5% | 1.70 (0.89, 3.28) |
100 | 34.0% | 2.58 * (1.42, 4.67) |
0.0004 | |
| 2 Intake Age Ranges Steady + | 174 | 57 | 15.8% | 48 | 25.0% | 1.58 (0.73, 3.43) |
69 | 40.6% | 2.57 * (1.32, 4.99) |
0.0012 | |
| 2nd Molars | 2-5 Years | 251 | 80 | 6.3% | 78 | 15.4% | 2.46 (0.91, 6.66) |
93 | 28.0% | 4.47 * (1.80, 11.10) |
<0.0001 |
| 5-8 Years | 251 | 87 | 5.7% | 76 | 19.7% | 3.43 * (1.31, 9.01) |
88 | 26.1% | 4.55 * (1.81, 11.42) |
0.0002 | |
| 2-8 Years | 251 | 89 | 6.7% | 71 | 18.3% | 2.72 * (1.09, 6.79) |
91 | 26.4% | 3.91 * (1.68, 9.11) |
0.0003 | |
| 2 Intake Age Ranges Steady + | 155 | 54 | 3.7% | 35 | 20.0% | 5.40 * (1.19, 24.51) |
66 | 30.3% | 8.18 * (2.00, 33.46) |
0.0001 | |
*
Relative risk and corresponding 95% confidence interval entirely above 1.
**
p-value for Cochran-Armitage test for linear trend.
***
Fluorosis prevalence is defined as 2 or more teeth in a tooth group with definitive fluorosis using Fluorosis Risk Index criteria. Subjects with only one tooth with definitive fluorosis were excluded from the analysis.
+
Includes subjects who were in the same fluoride intake tertile for both age intervals.