Zhen O Y, Baolin L
Ann Hum Biol. 1986 Mar-Apr;13(2):183-7. doi: 10.1080/03014468600008331.
School children aged 7 to 17 in the Northern Chinese city of Harbin have TW2 bone ages comparable to the British standards from age 7 to 9 in girls and 7 to 10 in boys. Thereafter they are some six months to a year ahead of the British standards.
中国北方城市哈尔滨7至17岁的在校儿童,其TW2骨龄在女孩7至9岁、男孩7至10岁时与英国标准相当。此后,他们比英国标准超前约6个月至1年。