# Analysis of risk factors associated with pre-myopia among primary school students in the Mianyang Science City

## TL;DR

This study examines pre-myopia prevalence and risk factors among primary school students in Mianyang Science City to guide prevention policies.

## Contribution

The study identifies specific risk factors for pre-myopia in primary school students using cluster sampling and logistic regression analysis.

## Key findings

- The prevalence rate of pre-myopia was 45.27% with no significant difference between boys and girls.
- Pre-myopia prevalence decreases with increasing age.
- Key risk factors include parental myopia, low outdoor time, excessive screen use, and poor posture.

## Abstract

Objectives To find out the prevalence rate of pre-myopia among primary school students in the Mianyang Science City Area, analyze its related risk factors, and thus provide a reference for local authorities to formulate policies on the prevention and control of myopia for primary school students.

Methods From September to October 2021, Cluster sampling was adopted by our research group to obtain the vision levels of primary school students employing a diopter test in the Science City Area. In addition, questionnaires were distributed to help us find the risk factors associated with pre-myopia. Through the statistical analysis, we identify the main risk factors for pre-myopia and propose appropriate interventions.

Results The prevalence rate of pre-myopia among primary school students in the Science City Area was 45.27% (1020/2253), of which 43.82% were boys and 46.92% were girls, with no statistically significant difference in the prevalence rate of myopia between boys and girls (2 =2.171, P=0.141). The results of the linear trend test showed that the prevalence rate of pre-myopia tends to decrease with increasing age (Z=296.521, P=0.000). Logistic regression analysis demonstrated that the main risk factors for pre-myopia were having at least one parent with myopia, spending less than 2 hours a day outdoors, using the eyes continuously for more than 1 hour, looking at electronic screens for more than 2 hours, and having an improper reading and writing posture.

Conclusion The Science City Area has a high prevalence rate of pre-myopia among primary school students. It is proposed that students, schools, families, and local authorities work together to increase the time spent outdoors, reduce digital screens and develop scientific use of eye habits.