. 2018 Jun 11;30:41. doi: 10.1186/s40557-018-0252-x

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

		Visit Index^a		p value
		Mean	SD	p value
Conjunctivitis	PM10 top 20% districts	0.8	0.5	< 0.01
Conjunctivitis	PM10 bottom 20% districts	0.3	0.7	< 0.01
Keratitis	PM10 top 20% districts	2.4	0.9	< 0.05fIn multiple regression
Keratitis	PM10 bottom 20% districts	1.4	1.7	< 0.05fIn multiple regression

Abbreviations: SD standard deviation

^aVisit Index – number of patients with conjunctivitis or keratitis / number of all patients × 1000