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Protective effect of smoking against pterygium development in men: a nationwide longitudinal cohort study in South Korea

 Tyler Hyungtaek Rim  ;  Dong Wook Kim  ;  Ching-Yu Cheng  ;  Sung Soo Kim 
 BMJ OPEN, Vol.7(11) : e017014, 2017-11 
Journal Title
Issue Date
Adult ; Aged ; Cigarette Smoking* ; Humans ; Incidence ; Longitudinal Studies ; Male ; Middle Aged ; Multivariate Analysis ; Propensity Score ; Protective Factors ; Pterygium / epidemiology* ; Republic of Korea / epidemiology ; Retrospective Studies ; Risk Reduction Behavior*
cigarettes ; incidence ; pterygium ; smoking
Objective: The present study aimed to evaluate the association between smoking and incident pterygium in adult Korean men. Design: A retrospective nationwide longitudinal cohort. Setting: National Health Insurance database of South Korea. Participants: This study included Korean men (age range: 40-79 years) registered in the Korea National Health Insurance Service database from 2002 through 2013. We compared HRs for pterygium between 90 547 current/past and 90 547 never-smokers via 1:1 propensity-matched analysis. Primary outcome measure: Incident cases of pterygium were identified from the database. Results: Pterygium developed in 5389 (6.0%) never-smokers and 3898 (4.3%) past/current smokers (P<0.001). The incidence of pterygium per 1000 person-years in never-smokers and in past/current smokers was 6.5 and 4.7, respectively (age-adjusted HR, 0.73; 95% CI, 0.70 to 0.76). This protective effect was more pronounced among current smokers than among past smokers (for current smokers: HR, 0.68; 95% CI, 0.65 to 0.71 and for past smokers: HR, 0.85; 95% CI, 0.80 to 0.90). A longer duration of smoking and higher amounts of cigarette consumption were associated with a lower incidence of pterygium. Conclusions: Longitudinally, cigarette smoking was associated with a reduced risk of pterygium, and this protective effect was more pronounced among current smokers than among past smokers.
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1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Sung Soo(김성수) ORCID logo https://orcid.org/0000-0002-0574-7993
Rim, Tyler Hyungtaek(임형택)
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