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The incidence and prevalence of pterygium in South Korea: A 10-year population-based Korean cohort stud

Authors
 Tyler Hyungtaek Rim  ;  Min Jae Kang  ;  Moonjung Choi  ;  Kyoung Yul Seo  ;  Sung Soo Kim 
Citation
 PLoS One, Vol.12(3) : e0171954, 2017 
Journal Title
 PLoS One 
Issue Date
2017
MeSH
Adolescent ; Adult ; Age Factors ; Aged ; Aged, 80 and over ; Child ; Child, Preschool ; Cities ; Conjunctiva/surgery ; Female ; Humans ; Incidence ; Income ; Infant ; Male ; Middle Aged ; Prevalence ; Proportional Hazards Models ; Pterygium/epidemiology* ; Pterygium/surgery ; Republic of Korea/epidemiology ; Retrospective Studies ; Risk Factors ; Sex Factors ; Young Adult
Abstract
Although numerous population-based studies have reported the prevalences and risk factors for pterygium, information regarding the incidence of pterygium is scarce. This population-based cohort study aimed to evaluate the South Korean incidence and prevalence of pterygium. We retrospectively obtained data from a nationally representative sample of 1,116,364 South Koreans in the Korea National Health Insurance Service National Sample Cohort (NHIS-NSC). The associated sociodemographic factors were evaluated using multivariable Cox regression analysis, and the hazard ratios and confidence intervals were calculated. Pterygium was defined based on the Korean Classification of Diseases code, and surgically removed pterygium was defined as cases that required surgical removal. We identified 21,465 pterygium cases and 8,338 surgically removed pterygium cases during the study period. The overall incidences were 2.1 per 1,000 person-years for pterygium and 0.8 per 1,000 person-years for surgically removed pterygium. Among subjects who were ≥40 years old, the incidences were 4.3 per 1,000 person-years for pterygium and 1.7 per 1,000 person-years for surgically removed pterygium. The overall prevalences were 1.9% for pterygium and 0.6% for surgically removed pterygium, and the prevalences increased to 3.8% for pterygium and 1.4% for surgically removed pterygium among subjects who were ≥40 years old. The incidences of pterygium decreased according to year. The incidence and prevalence of pterygium were highest among 60-79-year-old individuals. Increasing age, female sex, and living in a relatively rural area were associated with increased risks of pterygium and surgically removed pterygium in the multivariable Cox regression analysis. Our analyses of South Korean national insurance claims data revealed a decreasing trend in the incidence of pterygium during the study period.
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DOI
10.1371/journal.pone.0171954
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
강민재(Kang, M-j)
김성수(Kim, Sung Soo) ORCID logo https://orcid.org/0000-0002-0574-7993
서경률(Seo, Kyuong Yul) ORCID logo https://orcid.org/0000-0002-9855-1980
임형택(Rim, Tyler Hyungtaek)
최문정(Choi, Moonjung)
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/154394
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