Table 3: Mean difference (±standard deviation) between dental age based on the Demirjian method and chronological age as determined by the different methods in girls.

Age group ( ) French-Canadian (SD) Belgian (SD)Kuwaiti (SD)Saudi (SD)

4-5 (9)0.90 (0.72)−0.36 (1.41)0.62 (0.52)NA
5-6 (20)1.26 (0.66)1.38 (1.36)0.95 (0.69)NA
6-7 (22)1.13 (0.45)1.96 (0.85)0.92 (0.62)NA
7-8 (40)0.98 (0.65)2.82 (1.22)1.24 (0.82)1.51 (0.57)
8-9 (38)0.42 (0.69)2.73 (0.83)0.76 (0.53)0.90 (0.57)
9-10 (24)0.36 (0.83)2.95 (1.02)0.56 (0.67)0.60 (0.65)
10-11 (24)1.05 (0.70)3.28 (0.68)0.50 (0.90)0.76 (0.56)
11-12 (6)0.53 (0.42)2.68 (0.04)0.15 (0.34)0.17 (0.27)
12-13 (12)0.74 (1.05)2.03 (0.47)0.25 (1.35)−0.09 (0.98)
13-14 (10)1.08 (1.06)1.79 (0.41)−0.15 (1.34)0.88 (1.43)

Total (205)0.83 (0.78)2.40 (1.26)0.74 (0.85)0.84 (0.84)