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Table 1 General characteristics of study subjects

From: Spatial analysis between particulate matter and emergency room visits for conjunctivitis and keratitis

Variables Number (%)
Total 769 (100.0)
 Conjunctivitis 191 (24.8)
 Keratitis 578 (75.2)
Sex
 Male 494 (64.2)
 Female 275 (35.8)
Age (years)
 < 20 157 (20.4)
 20–40 266 (34.6)
 40–60 268 (34.9)
 60–80 75 (9.8)
 ≥ 80 3 (0.4)
Address (district)
 Nam-gu 26 (3.4)
 Dalseo-gu 163 (21.2)
 Dalsung-goon 31 (4.0)
 Dong-gu 24 (3.1)
 Book-gu 205 (26.7)
 Seo-gu 236 (30.7)
 Suseong-gu 44 (5.7)
 Joong-gu 40 (5.2)
Total visitors (denominator) 282,017