Table 6. Comparison between chronological age and dental age estimated using Bedek et al., 7- teeth formulae in boys and girls.

Age Groups (n)	Mean (SD)			95% CI of age difference	t statistics (df)	p-value
	Chronological Age (CA)	Dental Age (DA)	DA- CA (SE)
Boys
7- 7.9 (7)	7.35 (0.29)	6.58 (0.35)	-0.77 (0.13)	-1.11 to -0.43	-5.57 (6)	0.001*
8- 8.9 (14)	8.51 (0.29)	7.17 (0.69)	-1.33 (0.21)	-1.77 to -0.89	-6.6 (13)	0.000*
9- 9.9 (24)	9.37 (0.26)	8.5 (1.38)	-0.87 (0.28)	-1.46 to -0.27	-3.01 (23)	0.006*
10- 10.9 (28)	10.39 (0.26)	9.72 (0.93)	-0.66 (0.87)	-1.01 to -0.32	-4.01 (27)	0.000*
11- 11.9 (36)	11.4 (0.29)	11.31 (1.01)	-0.08 (0.16)	-0.41 to 0.23	-0.55 (35)	0.582
12- 12.9 (49)	12.47 (0.27)	11.9 (0.19)	-0.56 (0.18)	-0.94 to -0.18	-3.01 (48)	0.004*
13- 13.9 (53)	13.51 (0.29)	13.07 (1.24)	-0.43 (0.15)	-0.74 to -0.11	-2.77 (52)	0.008*
14- 14.9 (64)	14.44 (0.29)	13.88 (0.9)	-0.55 (0.11)	-0.77 to -0.34	-5.13 (63)	0.000*
7- 14.9 (275)	12.17 (2.01)	11.61 (2.38)	-0.55 (0.06)	-0.68 to -0.42	-8.47 (274)	0.000*
Girls
7- 7.9 (10)	7.52 (0.31)	7.93 (1.49)	0.41 (0.45)	-0.61 to 1.43	0.91 (9)	0.389
8- 8.9 (16)	8.34 (0.25)	7.86 (0.91)	-0.48 (0.25)	-1.02 to 0.06	-1.89 (15)	0.078
9- 9.9 (22)	9.45 (0.25)	9.22 (1.86)	-0.22 (0.39)	-1.05 to 0.59	-0.57 (21)	0.570
10- 10.9 (37)	10.42 (0.25)	10.01 (1.17)	-0.41 (0.18)	-0.78 to -0.04	-2.26 (36)	0.030*
11- 11.9 (94)	11.41 (0.28)	10.88 (1.12)	-0.52 (0.11)	-0.75 to -0.29	-4.50 (93)	0.000*
12- 12.9 (79)	12.43 (0.28)	12.01 (1.16)	-0.42 (0.12)	-0.67 to -0.16	-3.29 (78)	0.001*
13- 13.9 (53)	13.46 (0.29)	13.23 (1.06)	-0.22 (0.14)	-0.51 to 0.06	-1.59 (52)	0 118
14- 14.9 (64)	14.46 (0.23)	14.16 (0.75)	-0.29 (0.09)	-0.47 to -0.11	-3.24 (63)	0.002*
7- 14.9 (375)	11.99 (1.8)	11.62 (2.11)	-0.36 (0.05)	-0.48 to -0.25	-6.32 (374)	0.000*

*Statistically significant (p<0.05); SD Standard deviation; SE Standard error; df degree of freedom