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Ten-year incidence and prevalence of clinically diagnosed blepharitis in South Korea: A nationwide population-based cohort study.

Clin Exp Ophthalmol. 2017 Feb 09;:

Authors: Rim TH, Kang MJ, Choi M, Seo KY, Kim SS

Abstract
IMPORTANCE: Blepharitis is one of the most common conditions. However, no study has yet evaluated the epidemiology by evaluating a large population-based sample.
BACKGROUND: To evaluate the incidence and prevalence of clinically diagnosed blepharitis in South Korea.
DESIGN: Nationwide population-based study.
PARTICIPANTS: We investigated the Korean National Health Insurance Service-National Sample Cohort, a representative 1 million-sample of the Korean population, for patients diagnosed with blepharitis according to the Korean Classification of Diseases.
METHODS: Annual and overall incidence and prevalence of blepharitis during the study period (2004-2013) were estimated after excluding chronic blepharitis patients, diagnosed during 2002-2003. Sociodemographic factors and comorbidities associated with blepharitis were evaluated using Cox proportional hazard regression.
MAIN OUTCOME MEASURES: The first occurrence of blepharitis (Korean Classification of Diseases [KCD], H010, corresponding to the International Classification of Diseases-9-Clinical Modification [ICD-9-CM], 373.0).
RESULTS: A total of 1,116,363 individuals over 9,698,118 person-years were evaluated (mean follow-up: 8.7 years) from 2004 to 2013. The overall incidence was 1.1 (95 % Confidence Interval [CI], 1.1 - 1.1) per 100 person-years. The incidence increased with time (0.9 versus 1.3 per 100 person-years, in 2004 and 2013, respectively) and was higher in female patients (1.3 versus 0.9 per 100 person-years, respectively). The incidence was higher in both the elderly and children than in adolescents or young adults. The overall prevalence was 8.1% (95% CI: 8.0-8.1) among subjects aged 40 years or older. Chalazion, gastritis, Sjögren's syndrome, pterygium, rosacea, prostatic hypertrophy, atopy, irritable bowel disease, and peptic ulcer were associated with an increased incidence of blepharitis in the multivariable Cox model.
CONCLUSIONS: We found that blepharitis was a relatively common disease, and is associated with various ocular and systemic conditions.

PMID: 28183148 [PubMed - as supplied by publisher]

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