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Table 4 Percentage change (95% confidence interval) of total children respiratory outpatients per 10 μg/m3 increase in concentrations of pollutants in the single and two-pollutant models

From: Association of air pollution with outpatient visits for respiratory diseases of children in an ex-heavily polluted Northwestern city, China

Pollutants

Single- and Two-pollutant models

Estimates

PM10

PM10

0.06 (−0.18, 0.31)

PM10 + NO2

−0.12 (− 0.38, 0.13)

PM10 + SO2

−0.04 (− 0.29, 0.22)

PM2.5

PM2.5

0.64 (− 0.10, 1.38)

PM2.5 + NO2

−0.47 (−1.32, 0.38)

PM2.5 + SO2

−0.08 (− 0.94, 0.79)

NO2

NO2

2.50 (1.54, 3.48)

NO2 + PM10

2.64 (1.63, 3.65)

NO2 + PM2.5

2.83 (1.70, 3.97)

NO2 + SO2

2.17 (1.10, 3.26)

SO2

SO2

3.50 (1.51, 5.53)

SO2 + PM10

3.57 (1.52, 5.65)

SO2 + PM2.5

3.62 (1.26, 6.03)

SO2 + NO2

1.49 (−0.68, 3.70)

  1. PM2.5 particulate matter with aerodynamic diameter ≤ 2.5 μm, PM10 particulate matter with aerodynamic diameter ≤ 10 μm, NO2 nitrogen dioxide, SO2 sulfur dioxide. Six-day moving average (lag 05) concentrations of pollutants were used. Bold values denote significant differences