Dental Age and Tooth Development in Orthodontic Patients with Agenesis of Permanent Teeth

Table 2

Underestimation of dental and chronological age (DA-CA) in the children with congenitally missing permanent teeth (CMPT) and nonaffected children (control).

Sex		CA (years)	DA (years)	DA-CA (years)	(df)
	149	10.65 ± 2.15	9.85 ± 2.17	−0.80 ± 0.97	−10.11 (148)	<0.001
		10.65 ± 2.15	10.42 ± 1.96	−0.23 ± 0.90	−3.10 (148)	0.002
	196	10.59 ± 2.04	9.70 ± 1.92	−0.88 ± 1.14	−10.81 (195)	<0.001
		10.58 ± 2.03	10.31 ± 1.83	−0.27 ± 0.89	−4.25 (195)	<0.001
	345	10.61 ± 2.08	9.77 ± 2.02	−0.85 ± 1.07	−14.71 (344)	<0.001
		10.61 ± 2.08	10.36 ± 1.88	−0.25 ± 0.89	−5.24 (344)	<0.001

, a number of participants; CA, chronological age; DA, dental age; DA-CA, difference between DA and CA; , paired samples -test; df, degrees of freedom.