Table 4 Minimum (Min.), maximum (Max.) and mean (DA-CA) difference between the chronological (CA) and dental age (DA) in Japanese males and females using the southern Han Chinese reference dataset and the six different dental age (DA) calculation methods

Chronological Age (CA)

9.06

4.59

–

–

–

9.61

4.34

–

–

–

DA - No Weighting [nil]

9.00

4.73

0.06

0.85

0.397

9.56

4.44

0.05

0.85

0.542

DA - Weighted Average [n-tds]

9.01

4.72

0.05

0.88

0.445

9.54

4.43

0.07

0.86

0.373

DA - Weighted Average [sd-tds]

9.03

4.72

0.03

0.86

0.656

9.61

4.42

0.00

0.85

0.972

DA - Weighted Average [se-tds]

9.03

4.73

0.03

0.86

0.624

9.61

4.43

−0.01

0.86

0.926

DA - Weighted Average [1/sd-tds]

8.97

4.73

0.09

0.85

0.203

9.52

4.46

0.09

0.85

0.236

DA - Weighted Average [1/se-tds]

8.98

4.73

0.08

0.85

0.228

9.52

4.45

0.09

0.85

0.208