Table 3.
Results of the calculation of the dental age with the Willems method. The Wilcoxon test for paired data was applied by age groups and sex to compare the chronological age and dental age. Statistical tests were performed at a 95% confidence level (p ≤ 0.05). DA Dental age, CA Chronological age, Diff.SD Standard deviation differences, SD Standard deviation, O Overestimation, U Underestimation
| Age groups | n | CA | DA Willems | p-value | CA-DA | Diff.SD | Trend | ||
|---|---|---|---|---|---|---|---|---|---|
| mean | SD | mean | SD | ||||||
| Girls | |||||||||
| 4-6.9 | 59 | 6.46 | 0.48 | 7.00 | 0.89 | 0.000 | -0.54 | 0.70 | O |
| 7-7.9 | 65 | 7.50 | 0.30 | 7.77 | 0.79 | 0.008 | -0.26 | 0.73 | O |
| 8-8.9 | 69 | 8.45 | 0.28 | 8.37 | 0.60 | 0.145 | 0.08 | 0.59 | U |
| 9-10.9 | 67 | 9.97 | 0.57 | 10.13 | 1.25 | 0.321 | -0.16 | 1.05 | O |
| 11-13.9 | 42 | 12.14 | 0.63 | 12.08 | 1.32 | 0.965 | 0.05 | 1.22 | U |
| Total | 302 | ||||||||
| Boys | |||||||||
| 4-6.9 | 63 | 6.40 | 0.55 | 6.88 | 1.24 | 0.000 | -0.48 | 0.93 | O |
| 7-7.9 | 54 | 7.60 | 0.28 | 8.26 | 1.09 | 0.000 | -0.66 | 1.04 | O |
| 8-8.9 | 67 | 8.45 | 0.29 | 8.81 | 0.76 | 0.000 | -0.36 | 0.67 | O |
| 9-10.9 | 63 | 9.89 | 0.58 | 10.11 | 1.16 | 0.163 | -0.23 | 1.03 | O |
| 11-13.9 | 55 | 12.15 | 0.60 | 12.16 | 0.88 | 0.782 | -0.01 | 0.87 | O |
| Total | 302 | ||||||||