Table 8. Comparison between chronological age and dental age estimated using Bedek et al., 5- 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)	6.5 (0.41)	-0.85 (0.16)	-1.26 to -0.44	-5.12 (6)	0.002*
8- 8.9 (14)	8.51 (0.29)	7.24 (0.77)	-1.27 (0.22)	-1.75 to -0.78	-5.7 (13)	0.000*
9- 9.9 (24)	9.37 (0.26)	8.46 (1.37)	-0.91 (0.28)	-1.49 to -0.31	-3.18 (23)	0.004*
10- 10.9 (28)	10.39 (0.26)	9.72 (0.93)	-0.67 (0.16)	-1.02 to -0.32	-4.03 (27)	0.000*
11- 11.9 (36)	11.4 (0.29)	11.25 (1.02)	-0.14 (0.16)	-0.48 to 0.18	-0.89 (35)	0.379
12- 12.9 (49)	12.47 (0.27)	11.85 (1.35)	-0.61 (0.18)	-0.99 to -0.23	-3.26 (48)	0.002*
13- 13.9 (53)	13.51 (0.29)	13.03 (1.25)	-0.46 (0.15)	-0.78 to -0.15	-2.99 (52)	0.004*
14- 14.9 (64)	14.44 (0.29)	13.84 (0.93)	-0.59 (0.11)	-0.81 to -0.37	-5.31 (63)	0.000*
7- 14.9 (275)	12.17 (2.01)	11.58 (2.38)	-0.59 (0.06)	- 0.72 to -0.46	-8.94 (274)	0.000*
Girls
7- 7.9 (10)	7.52 (0.31)	7.65 (1.71)	0.13 (0.51)	-1.02 to 1.3	0.26 (9)	0.798
8- 8.9 (16)	8.34 (0.25)	7.67 (1.19)	-0.66 (0.31)	-1.33 to 0.01	-2.13 (15)	0.050
9- 9.9 (22)	9.45 (0.25)	9.11 (1.92)	-0.34 (0.41)	-1.19 to 0.51	-0.83 (21)	0.415
10- 10.9 (37)	10.42 (0.25)	9.83 (1.25)	-0.59 (0.19)	-0.99 to -0.19	-3.03 (36)	0.004*
11- 11.9 (94)	11.41 (0.28)	10.79 (1.21)	-0.61 (0.12)	-0.86 to -0.36	-4.86 (93)	0.000*
12- 12.9 (79)	12.43 (0.28)	12.01 (1.19)	-0.43 (0.13)	-0.69 to -0.17	-3.3 (78)	0.001*
13- 13.9 (53)	13.46 (0.29)	13.26 (1.04)	-0.21 (0.14)	-0.48 to 0.07	-1.47 (52)	0.147
14- 14.9 (64)	14.46 (0.23)	14.11 (0.81)	-0.34 (0.09)	-0.54 to -0.15	-3.56 (63)	0.001*
7- 14.9 (375)	11.99 (1.8)	11.55 (2.19)	-0.43 (1.18)	-0.55 to -0.31	-7.14 (374)	0.000*

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