Table 1: This table is used to transform an observed Greulich-Pyle bone age (GP BA) into the bone age scale BX-China05, adapted to Chinese children in 2005. The Boys column indicates the correction for boys, and similarly for the Girls column. Example: A girl with GP BA = 10 y has BX-China05 = = 9.9 years.

GP BA (years) BX-China05 Correction (years)
BoysGirls

2.0 0.0−0.2
2.5−0.1−0.2
3.0 −0.2 0.1
3.5 −0.2 0.3
4.0 −0.1 0.4
4.5 −0.0 0.4
5.0 0.0 0.3
5.5 0.1 0.1
6.0 0.2 −0.1
6.5 0.3 −0.1
7.0 0.5 0.2
7.5 0.6 0.3
8.0 0.5 0.2
8.5 0.4 0.1
9.0 0.3 −0.0
9.5 0.2 −0.1
10.0 0.1 −0.1
10.5 0.0 −0.2
11.0 −0.1 −0.2
11.5 −0.2 −0.3
12.0 −0.4 −0.5
12.5 −0.5 −0.6
13.0 −0.4 −0.7
13.5 −0.4 −0.8
14.0 −0.4 −0.9
14.5 −0.5 −1.0
15.0 −0.7 −1.2
15.5 −0.9 −1.2
16.0 −1.0 −1.1
16.5 −1.1 −1.1
17.0 and above −1.2 −1.2