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Mean penetration rates at different time intervals
| Time (months) | Penetration rate (mm/year) | Number of radiographs analyzed |
|---|---|---|
| 5.0 ± 0.5 (3.6–7.0) | 0.10 ± 0.05 (0.014–0.36) | 17 |
| 11.0 ± 0.6 (8.3–12.5) | 0.10 ± 0.03 (0.004–0.23) | 22 |
| 14.3 ± 0.6 (12.6–16.9) | 0.11 ± 0.03 (0.017–0.24) | 22 |
| 20 ± 0.3 (18.3–21.6) | 0.11 ± 0.03 (0.007–0.24) | 32 |
Values are expressed as means ± 95% confidence limits with ranges in parentheses.
