Automated Determination of Bone Age in a Modern Chinese Population

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 = 10−0.1 = 9.9 years.

GP BA (years)	BX-China05 Correction (years)
	Boys	Girls
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