Table 4 Associations between pollutant concentrations and pediatric asthma emergency department visits per IQR increases in concentration.^a

1.065 (1.035, 1.095)

χ² = 18.89, p < 0.001

1.065 (1.036, 1.095)

χ² = 19.47, p < 0.001

1.063 (1.033, 1.094)

χ² = 17.68, p < 0.001

1.024 (1.003, 1.046)

χ² = 4.82, p = 0.028

1.024 (1.002, 1.046)

χ² = 4.40, p = 0.036

1.020 (0.998, 1.041)

χ² = 3.31, p = 0.069

1.031 (1.006, 1.056)

χ² = 6.08, p = 0.014

1.039 (1.013, 1.065)

χ² = 8.96, p = 0.003

1.038 (1.012, 1.065)

χ² = 8.28, p = 0.004

1.026 (1.002, 1.051)

χ² = 4.63, p = 0.031

1.030 (1.005, 1.056)

χ² = 5.64, p = 0.018

1.028 (1.003, 1.053)

χ² = 4.93, p = 0.026

1.021 (0.997, 1.045)

χ² = 3.05, p = 0.081

1.038 (1.012, 1.065)

χ² = 8.39, p = 0.004

1.029 (1.005, 1.054)

χ² = 5.43, p = 0.020

1.026 (1.005, 1.047)

χ² = 6.22, p = 0.013

1.025 (1.006, 1.044)

χ² = 6.55, p = 0.010

1.034 (1.009, 1.060)

χ² = 6.97, p = 0.008

1.051 (1.027, 1.076)

χ² = 17.98, p < 0.001

1.053 (1.029, 1.077)

χ² = 19.81, p < 0.001

1.052 (1.030, 1.074)

χ² = 22.30, p < 0.001

1.037 (1.016, 1.058)

χ² = 12.17, p < 0.001

1.038 (1.014, 1.063)

χ² = 9.80, p = 0.002

1.043 (1.018, 1.069)

χ² = 11.32, p = 0.001

1.009 (0.992, 1.027)

χ² = 1.18, p = 0.277

1.023 (1.006, 1.042)

χ² = 6.60, p = 0.010

1.020 (1.001, 1.039)

χ² = 4.48, p = 0.034