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Table 1 Descriptive statistics of emergency room visits for respiratory diseases from Jan 1, 2014 to Dec 31, 2019

From: Association and interaction of O3 and NO2 with emergency room visits for respiratory diseases in Beijing, China: a time-series study

Variable

TRD

AURI

LRTI

Pneumonia

COPD

Asthma

N

144,326

80,302

24,621

24,484

2,553

2,740

Sex, n(%)

 Male

74,489 (51.6%)

38,834 (48.4%)

13,124 (53.3%)

13,060 (53.3%)

1,622 (63.5%)

1,181 (43.1%)

 Female

69,837 (48.4%)

41,468 (51.6%)

11,497 (46.7%)

11,424 (46.7%)

931 (36.5%)

1,559 (56.9%)

Age, n(%)

  < 18 years

48,937 (33.9%)

41,134 (51.2%)

4,237 (17.2%)

4,234 (17.3%)

0 (0.0%)

276 (10.1%)

 18–64 years

65,099 (45.1%)

36,080 (44.9%)

8,856 (36.0%)

8,750 (35.7%)

314 (12.3%)

1,776 (64.8%)

  > 64 years

30,290 (21.0%)

3,088 (3.8%)

11,528 (46.8%)

11,500 (47.0%)

2,239 (87.7%)

688 (25.1%)

  1. TRD Total respiratory disease, AURI Acute upper respiratory infection, LRTI Lower respiratory tract infection, COPD Chronic obstructive pulmonary disease