Table 2 The fitting effect of different models.

Method	Gender	CA^a	DA^b	AD^c	P value^d	MAE (< 18)	MAE (< 16)
Demirjian	Female	11.18(3.83)	11.49(3.72)	0.31(1.18)	0.00***	0.95	0.94
Demirjian	Male	10.68(3.76)	11.10(3.74)	0.42(1.15)	0.00***	0.96	0.96
Willems	Female	11.18(3.83)	11.02(3.78)	− 0.16(0.98)	0.00***	0.78	0.73
Willems	Male	10.68(3.76)	10.77(3.70)	0.09(0.98)	0.02***	0.77	0.76
Modified	Female	11.18(3.83)	11.16(3.73)	− 0.02(0.97)	0.61	0.77	0.71
Modified	Male	10.68(3.76)	10.68(3.55)	0.01(0.96)	0.83	0.76	0.72

MAE Mean absolute error.
^aChronological age.
^bDental age.
^cAge deviation, AD = dental age–chronological age. Chronological age, dental age and the age deviation are given as the mean (standard deviation).
^dPaired T test significance of chronological age and dental age.

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