Fig 1.
Flow chart of paticipant inclusion and exclusion from the National Health and Nutrients Examination Survey in this study.
Table 1.
Characteristics of the study population according to the spherical equivalent (n = 8706).
Table 2.
Risk factors affecting myopia.
Fig 2.
Distribution of age at menarche among the participants of the National Health and Nutrients Examination Survey.
Fig 3.
Optimal cut-off point displayed along with the different cut-off points with the corresponding p values plotted on a logarithmic scale.
The optimal cut-off point was 15 years in National Health and Nutrients Examination Survey (p < 0.0001).