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Table 1 Demographic characteristics of chronic obstructive pulmonary disease (COPD) hospital visits between January 1, 2010, and June 30, 2012, in Beijing, China

From: Short-term effects of ambient fine particulate matter pollution on hospital visits for chronic obstructive pulmonary disease in Beijing, China

Variable

No.

Outpatient visits

3,503,313

 Sex

  Male (%)

1,878,395 (53.6)

  Female (%)

1,624,918 (46.4)

 Age (year) (mean ± SD)

64.3 ± 12.9

  <  65 (%)

1,714,404 (48.9)

  ≥ 65 (%)

1,788,909 (51.1)

Inpatient visits

126,982

 Sex

  Male (%)

76,357 (60.1)

  Female (%)

50,625 (39.9)

 Age (year) (mean ± SD)

71.6 ± 12.2

  <  65 (%)

31,870 (25.1)

  ≥ 65 (%)

95,112 (74.9)