Evidence map›Paper›PMID 34460851›Full record

ArticlePloS one2021

The prevalence and correlates of vision impairment and glasses ownership among ethnic minority and Han schoolchildren in rural China.

Huan Wang, Brandon Barket, Sharon Du, Dimitris Friesen, Ezra Kohrman, Esther Tok, Baixiang Xiao, Wenyong Huang, Ving Fai Chan, Graeme MacKenzie and 1 more

Open access · goldAbstract read
In one paragraph

Article in PloS one, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.

0numbers the graph read from it
0cells of the map it votes in
6citing papers in PubMed
0.6field-weighted citation impact, top 31% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

6 citing papers in PubMed, 4 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors at 4 institutions in 3 countries.

Huan WangStanford Center on China's Economy and Institutions, Stanford University, California, Stanford, United States of America.
Brandon BarketStanford Center on China's Economy and Institutions, Stanford University, California, Stanford, United States of America.
Sharon DuStanford Center on China's Economy and Institutions, Stanford University, California, Stanford, United States of America.ORCID 0000-0003-2247-4787
Dimitris FriesenStanford Center on China's Economy and Institutions, Stanford University, California, Stanford, United States of America.
Ezra KohrmanStanford Center on China's Economy and Institutions, Stanford University, California, Stanford, United States of America.ORCID 0000-0001-5601-2316
Esther TokStanford Center on China's Economy and Institutions, Stanford University, California, Stanford, United States of America.
Baixiang XiaoAffiliated Eye Hospital of Nanchang University, Nanchang, China.
Wenyong HuangAffiliated Eye Hospital of Nanchang University, Nanchang, China.
Ving Fai ChanSchool of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, Northern Ireland, United Kingdom.ORCID 0000-0003-2261-0478
Graeme MacKenzieClearly Initiatives, London, England, United Kingdom.ORCID 0000-0001-6995-8557
Nathan CongdonState Key Laboratory of Ophthalmology and Division of Preventive Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China.
Hoover Institution · USNanchang University · CNQueen's University Belfast · GBDevelopment Initiatives · GB

Funding

Medical Research Council MR/S023208/1
6 · The paper itself

Abstract

purposeTo determine the prevalence of visual impairment and glasses ownership among Han Chinese and Hui minority junior high school children in Ningxia Hui Autonomous Region, China.

designPopulation-based cross-sectional study.

methodsVision screening was conducted on 20,376 children (age 12-15 years) in all 124 rural junior high schools in Ningxia. Personal and family characteristics, glasses ownership, and academic performance were assessed through a survey questionnaire and standardized mathematics test, respectively.

resultsThe prevalence of visual acuity (VA) ≤6/12 in either eye was significantly higher among Han (54.5%) than Hui (45.2%) children (P<0.001), and was significantly positively associated with age, female sex, Han ethnicity, parental outmigration for work, shorter time spent outside during recess, shorter time spent watching television and higher time spent studying. Among children with VA≤6/12 in both eyes, only 56.8% of Han and 41.5% of Hui children had glasses (P<0.001). Glasses ownership was significantly associated with worse vision, greater family wealth, female sex, higher test scores, age, parental outmigration for work, understanding of myopia and glasses, higher time spent studying and Han ethnicity.

conclusionOne of the first of its kind, this report on Han and Hui ethnic schoolchildren confirms a high prevalence of visual impairment among both populations, but slightly higher among the Han. Both groups, especially the Hui, have low rates of glasses ownership. Future interventions and policies designed to improve glasses usage should focus on populations with lower incomes and seek to correct erroneous beliefs about the safety of glasses and efficacy of traditional eye exercises.

Indexed as

Ethnic and Racial MinoritiesEyeglassesOwnershipRural PopulationAttitudeChinaFemaleHumansMaleMultivariate AnalysisRisk FactorsVision Disorders

Identifiers

PMID34460851
PMCPMC8405009
OpenAlexW3197295544

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.