Table 5.

Myopia diopters in different years and genders.

Variable		Without myopia	Mild myopia	Moderate myopia	Severe myopia	Hc value	P value
Year	2019	2,420	1,124	855	223	10.217	<0.001
	2020	2,123	1,016	918	193
	2021	2,466	1,134	888	205
Gender	Boy	3,860	1,524	1,311	288	59.787	<0.001
	Girl	3,149	1,750	1,350	333