Incident cardiovascular disease and particulate matter air pollution in South Korea using a population-based and nationwide cohort of 0.2 million adults

Table 2 Descriptive statistics of long-term PM₁₀ and PM_2.5 concentrations (μg/m³) of 196,167 subjects of the National Health Insurance Service-National Sample Cohort 2.0 in South Korea for 2007–2015 by four exposure periods

Pollutants	Exposure period	Mean ± SD	Interquartile range	Range
PM₁₀	Previous 1 year	50.5 ± 6.8	9.2	33.6–76.0
	Previous 3 years	51.2 ± 6.4	10.1	33.8–74.2
	Previous 5 years	52.3 ± 6.2	9.7	36.6–74.2
	5 years before baseline^a	55.7 ± 6.6	11.4	38.4–71.4
PM_2.5	Previous 1 year	26.4 ± 3.1	4.2	18.0–38.1
	Previous 3 years	27.5 ± 3.9	5.1	18.8–40.8
	Previous 5 years	28.1 ± 3.6	5.5	19.0–39.8
	5 years before baseline^a	31.2 ± 3.4	4.5	21.2–39.8

Abbreviations: PM₁₀ particulate matter 10 μm or less in diameter. PM_2.5 particulate matter 2.5 μm or less in diameter. SD standard deviation
^a5 years before baseline, 5-year average PM concentration for 2002–2006 before the baseline in 2007

ISSN: 1476-069X