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Table 1 Description of the study population

From: The short-term effects and burden of particle air pollution on hospitalization for coronary heart disease: a time-stratified case-crossover study in Sichuan, China

Study population

Number

%

CHD

104,779

100

 CCHD

83,471

79.7

 AMI

12,817

12.2

 UA

3946

3.8

Age

 < 45

4216

4.0

 45-64

25,586

24.4

 ≥ 65

74,977

71.6

Sex (n)

 Males

55,891

53.3

 Females

48,888

46.7

Season

 Warm season

49,919

47.6

 Cold season

54,860

52.4

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Environmental Health

ISSN: 1476-069X