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Table 1 Characteristics of the cases (n = 1597)

From: Fine particulate matter constituents associated with emergency room visits for pediatric asthma: a time-stratified case–crossover study in an urban area

Characteristic

Number

%

Age (mean ± SD)

6.1 ± 3.5

 

Male sex

1073

67.2

Cold season

971

60.8

Cold days (< 26.0 °C)

879

55.1

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BMC Public Health

ISSN: 1471-2458

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