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7.0 7 years 8 years 9 years 10 years 11 years 12 years ▲ Urban
6.5 Rural
6.0
5.5
▲ ▲
▲
CV⁃h 5.0 ▲ ▲ ▲ ▲ ▲ ▲ ▲
4.5
▲
▲ ▲ ▲ ▲ ▲
4.0 ▲ ▲ ▲ ▲ ▲ ▲
▲
3.5 ▲
3.0
2.5
1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019
Year
13 years 14 years 15 years 16 years 17 years 18 years ▲ Urban
7.0
6.5 ▲ Rural
6.0
▲
5.5 ▲ ▲
CV⁃h 5.0 ▲ ▲ ▲ ▲ ▲
4.5
4.0 ▲ ▲ ▲ ▲
▲
3.5 ▲ ▲ ▲
▲ ▲ ▲ ▲ ▲ ▲
3.0 ▲
2.5
1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019
Year
图2 1985—2019年不同年龄城乡男中小学生身高变异系数
Figure 2 Coefficient of variation in height among male primary and secondary school students of different ages in urban
and rural areas from 1985 to 2019

6.0 7 years 8 years 9 years 10 years 11 years 12 years
▲ Urban
5.5
Rural
5.0 ▲ ▲ ▲
▲ ▲ ▲
▲ ▲ ▲ ▲
▲
4.5
CV⁃h ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲
▲
4.0
▲ ▲
3.5
3.0
2.5
1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019
Year
6.0 13 years 14 years 15 years 16 years 17 years 18 years ▲ Urban
5.5 Rural
5.0
CV⁃h 4.5 ▲
4.0
▲ ▲ ▲
▲ ▲ ▲ ▲
3.5 ▲ ▲ ▲ ▲ ▲ ▲ ▲
▲ ▲
▲ ▲
3.0 ▲ ▲ ▲
▲ ▲
2.5
1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019 1985 2000 2010 2019
Year
图3 1985—2019年不同年龄城乡女中小学生身高变异系数
Figure 3 Coefficient of variation in height among female primary and secondary school students of different ages in urban
and rural areas from 1985 to 2019