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Table 3 Conjunctivitis or keratitis patients number differences between districts which stand for PM10 top 20% levels and districts which stand for PM10 bottom 20% levels from June, 2006 to December, 2014

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

  Visit Indexa p value
Mean SD
Conjunctivitis PM10 top 20% districts 0.8 0.5 < 0.01
PM10 bottom 20% districts 0.3 0.7
Keratitis PM10 top 20% districts 2.4 0.9 < 0.05fIn multiple regression
PM10 bottom 20% districts 1.4 1.7
  1. Abbreviations: SD standard deviation
  2. aVisit Index – number of patients with conjunctivitis or keratitis / number of all patients × 1000