Table 1 The test- and age-specific sample sizes, means and standard deviations among Chinese school-aged girls from 1985 to 2019*.

From: Population-based trends and distributional characteristics in sit-ups performance among school-aged girls in urban China over three decades

Tests

 

1985

1991

1995

2000

2005

2010

2014

2019

1-minute sit-ups (reps.)

N

102,284

35,147

52,756

54,415

58,672

53,666

53,552

52,229

 

M

23.7

30.3

31.8

31.1

27.7

27.0

28.8

30.7

 

SD

10.6

10.1

10.5

11.0

10.6

10.8

10.8

11.0

Height (cm)

N

102,284

35,147

52,756

54,446

58,764

53,744

53,637

52,910

 

M

145.1

147.1

147.4

148.1

148.7

149.4

150.3

150.9

 

SD

14.6

14.1

14.1

14.1

13.8

13.5

13.4

13.6

Mass (kg)

N

102,284

35,147

52,756

54,447

58,764

53,744

53,637

52,910

 

M

36.9

38.4

39.3

40.6

41.4

42.2

43.6

44.8

 

SD

11.6

11.6

12.1

12.6

12.6

12.5

13.0

14.0

Body mass index (kg/m2)*

N

-

-

-

54,420

58,763

53,744

53,637

52,910

 

M

-

-

-

18.0

18.3

18.4

18.9

19.2

 

SD

-

-

-

3.3

3.3

3.2

3.4

3.7

  1. N is the sample size, M is the mean, and SD is the standard deviation. * Body mass index data were reported only after 2000.