Table 2.
Mean difference (±standard deviation) between dental age based on the Demirjian method and chronological age as determined by the different methods in boys.
| Age group (n) | French-Canadian (SD) | Belgian (SD) | Kuwaiti (SD) | Saudi (SD) |
|---|---|---|---|---|
| 4-5 (7) | 0.75 (0.18) | −1.26 (0.53) | 0.03 (0.17) | NA |
| 5-6 (12) | 0.82 (0.78) | 0.11 (1.67) | 0.04 (0.79) | NA |
| 6-7 (26) | 1.04 (0.35) | 1.57 (0.96) | 0.51 (0.70) | NA |
| 7-8 (28) | 0.66 (0.42) | 2.11 (1.01) | 0.60 (0.69) | 1.68 (0.00) |
| 8-9 (26) | 0.69 (0.98) | 2.81 (1.33) | 0.85 (0.92) | 1.22 (0.77) |
| 9-10 (30) | 0.97 (0.84) | 3.23 (0.82) | 0.83 (0.57) | 0.95 (0.68) |
| 10-11 (30) | 1.21 (0.56) | 3.05 (0.48) | 0.60 (0.48) | 0.80 (0.43) |
| 11-12 (16) | 0.17 (1.05) | 2.14 (0.65) | −0.39 (0.62) | −0.19 (0.67) |
| 12-13 (30) | 0.69 (1.18) | 1.91 (0.53) | −0.20 (1.15) | −0.19 (0.88) |
| 13-14 (12) | −0.12 (0.69) | 1.20 (0.86) | −1.51 (0.63) | −1.22 (0.41) |
|
| ||||
| Total (217) | 0.76 (0.85) | 2.12 (1.36) | 0.30 (0.96) | 0.40 (1.00) |