Table 3 Minimum (Min.), maximum (Max.) and mean (DA-CA) difference between the chronological (CA) and dental age (DA) in Thai males and females using the southern Han Chinese reference dataset and the six different dental age (DA) calculation methods

Chronological Age (CA)

12.89

4.58

–

–

–

13.47

4.66

–

–

–

DA - No Weighting [nil]

13.00

4.36

−0.11

0.97

0.245

13.78

4.48

−0.31

1.26

0.003*

DA - Weighted Average [n-tds]

12.97

4.39

−0.08

0.94

0.372

13.78

4.50

−0.31

1.28

0.004*

DA - Weighted Average [sd-tds]

13.03

4.36

−0.14

0.97

0.117

13.82

4.47

−0.35

1.26

0.001*

DA - Weighted Average [se-tds]

13.05

4.35

−0.16

1.00

0.094

13.82

4.46

−0.35

1.25

0.001*

DA - Weighted Average [1/sd-tds]

12.96

4.37

−0.07

0.97

0.443

13.74

4.49

−0.27

1.26

0.012*

DA - Weighted Average [1/se-tds]

12.95

4.38

−0.06

0.95

0.536

13.74

4.50

−0.27

1.27

0.011*