Table 12. Comparison between chronological age and dental age estimated using Bedek et al., 1- tooth 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)	6.43 (0.0)	-0.92 (0.11)	-1.19 to -0.65	-8.32 (6)	0.000*
8- 8.9 (14)	8.51 (0.29)	7.2 (0.91)	-1.31 (0.26)	-1.89 to -0.72	-4.86 (13)	0.000*
9- 9.9 (24)	9.37 (0.26)	7.7 (1.41)	-1.67 (0.29)	-2.29 to -1.05	-5.57 (23)	0.000*
10- 10.9 (28)	10.39 (0.26)	8.8 (1.39)	-1.58 (1.32)	-2.1 to -1.07	-6.34 (27)	0.000*
11- 11.9 (36)	11.4 (0.29)	10.92 (1.35)	-0.47 (0.22)	-0.92 to -0.02	-2.13 (35)	0.040*
12- 12.9 (49)	12.47 (0.27)	11.65 (1.78)	-0.81 (0.24)	-1.31 to -0.31	-3.28 (48)	0.002*
13- 13.9 (53)	13.51 (0.29)	13.03 (1.32)	-0.46 (0.16)	-0.8 to -0.12	-2.77 (52)	0.008*
14- 14.9 (64)	14.44 (0.29)	13.72 (0.8)	-0.71 (0.1)	-0.92 to -0.51	-6.89 (63)	0.000*
7- 14.9 (275)	12.17 (2.01)	11.31 (2.62)	-0.86 (0.08)	-1.02 to -0.7	-10.71 (274)	0.000*
Girls
7- 7.9 (10)	7.52 (0.31)	8.07 (1.61)	0.55 (0.46)	-0.48 to 1.6	1.02 (9)	0.260
8- 8.9 (16)	8.34 (0.25)	7.76 (1.07)	-0.57 (0.28)	-1.18 to 0.02	-2.03 (15)	0.060
9- 9.9 (22)	9.45 (0.25)	9.04 (1.85)	-0.41 (1.87)	-1.24 to 0.41	-1.03 (21)	0.312
10- 10.9 (37)	10.42 (0.25)	9.88 (1.53)	-0.54 (0.23)	-1.02 to -0.05	-2.26 (36)	0.030*
11- 11.9 (94)	11.41 (0.28)	10.69 (1.34)	-0.71 (0.13)	-0.99 to -0.44	-5.16 (93)	0.000*
12- 12.9 (79)	12.43 (0.28)	11.74 (1.14)	-0.68 (0.12)	-0.93 to -0.43	-5.37 (78)	0.000*
13- 13.9 (53)	13.46 (0.29)	13.05 (1.13)	-0.41 (0.15)	-0.71 to -0.11	-2.72 (52)	0.009*
14- 14.9 (64)	14.46 (0.23)	14.05 (0.86)	-0.41 (0.1)	-0.61 to -0.2	-4.01 (63)	0.000*
7- 14.9 (375)	11.99 (1.8)	11.45 (2.17)	-0.53 (0.06)	-0.66 to -0.41	-8.38 (374)	0.000*

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