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Table 2 Prevalence of myopia and hyperopia for each year in school children (Hangzhou, China, 2023)

From: Survey on pattern of myopia in school children in Hangzhou after the COVID-19 pandemic: a school-based vision screening study

Age, y

n

Prevalence per year(%)

P value*

听听

2019

2020

2021

2022

2023

听听
听听

M

H

M

H

M

H

M

H

M

H

M

H

6

13,752

19.7

1.4

31.3#

1.2

27.6

2.2

17.7

1.9

13.2

1.1

鈥�&濒迟;鈥�0.001

鈥�&濒迟;鈥�0.001

7

13,556

31.9

0.9

42.1

1.8

43.0#

1.5

29.1

1.8

27.8

1.1

鈥�&濒迟;鈥�0.001

鈥�&濒迟;鈥�0.001

8

13,192

47.6

1.7

53.7#

1.3

53.5

1.3

40.2

1.4

41.0

1.0

鈥�&濒迟;鈥�0.001

0.103

9

14,172

52.7

1.7

64.1

1.1

67.8#

1.2

51.4

1.6

52.2

1.1

鈥�&濒迟;鈥�0.001

0.033

10鈥�11

12,547

66.7

0.9

71.8

1.3

72.8#

1.3

62.1

1.0

63.1

0.7

鈥�&濒迟;鈥�0.001

0.004

12鈥�13

11,866

72.5

0.8

77.1

1.0

81.9#

1.2

66.5

1.1

70.4

0.8

鈥�&濒迟;鈥�0.001

0.063

  1. Abbreviation: M Myopia, H Hyperopia
  2. Myopia was defined as SER of鈥夆垝鈥�0.50 D or less. Hyperopia was defined as SER of鈥�+鈥�2.00 D or greater
  3. #The highest myopia prevalence was from 2019 to 2023. *Comparing the variance for the prevalence of myopia and hyperopia across 5听years within each age group using the Chi-square test
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