Table 5 Cumulative (lag 0–6) percentage change in asthma hospitalizations (95% confidence interval) associated with an interquartile range increase in pollen or fungal spore concentration, by air pollutant concentrations (below or above the 50th and 85th percentile), Brussels-Capital Region, 2008–2013

 Taxon

PM_2.5 ≤ P50

PM_2.5 > P50

P interaction

PM_2.5 ≤ P85

PM_2.5 > P85

P interaction

PM₁₀ ≤ P50

PM₁₀ > P50

P interaction

PM₁₀ ≤ P85

PM₁₀ > P85

P interaction

 Alder

0.6

(−5.8, 7.4)

0.0

(−2.6, 2.6)

0.92

0.6

(−1.9, 3.2)

−2.2

(−6.7, 2.5)

0.76

0.3

(−6.2, 7.3)

−0.1

(−2.7, 2.6)

0.92

0.7

(−2.0, 3.5)

−2.9

(−7.0, 1.5)

0.54

 Hazel

−0.9

(−5.7, 4.2)

0.9

(−2.2, 4.1)

0.68

0.2

(−2.8, 3.4)

0.4

(−4.9, 6.0)

0.21

−0.2

(−5.6, 5.4)

0.6

(−2.5, 3.9)

0.35

0.4

(−2.7, 3.6)

−0.4

(−5.1, 4.5)

0.37

 Yew Cupressaceae

0.6

(−8.3, 10.4)

−2.6

(−7.3, 2.5)

0.62

−1.8

(−6.3, 3.0)

−9.3

(−19.0, 1.5)

0.63

0.7

(−8.4, 10.7)

−2.3

(−7.0, 2.7)

0.57

−2.7

(−7.8, 2.7)

−4.2

(−12.3, 4.5)

0.91

 Ash

0.1

(−0.6, 0.8)

−0.6

(−1.4, 0.3)

0.51

−0.1

(−0.6, 0.5)

−0.6

(−4.1, 3.1)

0.89

0.0

(−0.9, 0.8)

−0.2

(−0.9, 0.4)

0.78

−0.1

(−0.7, 0.4)

−0.2

(−2.3, 2.0)

0.54

 Hornbeam

0.9

(−0.1, 1.8)

0.7

(0.1, 1.3)*

0.53

0.9

(0.2, 1.6)*

0.1

(−2.0, 2.4)

0.38

0.7

(−0.2, 1.7)

0.7

(0.1, 1.4)*

0.63

0.9

(0.3, 1.6)*

1.1

(−0.9, 3.1)

0.83

 Birch

3.6

(0.5, 6.8)*

2.8

(0.6, 5.2)*

0.82

3.3

(1.1, 5.6)*

4.6

(0.5, 8.9)*

0.51

3.6

(−0.1, 7.4)

2.8

(0.7, 5.1)*

0.2

3.3

(0.9, 5.7)*

2.9

(0.2, 5.7)*

0.94

 Oak

−7.3

(−15.9, 2.2)

−4.2

(−10.4, 2.4)

0.51

−5.9

(−12.1, 0.6)

−3.7

(−11.3, 4.6)

0.59

−9.1

(−18.1, 0.9)

−3.3

(−10.0, 3.9)

0.61

−6.4

(−12.6, 0.3)

−2.5

(−9.9, 5.4)

0.74

 Plantain

5.1

(−16.2, 31.8)

3.1

(−15.2, 25.2)

0.92

5.6

(−11.1, 25.5)

−0.5

(−37.1, 57.5)

0.91

9.0

(−14.7, 39.3)

2.3

(−15.0, 23.3)

0.49

5.5

(−11.2, 25.4)

−14.3

(−43.3, 29.5)

0.85

 Grass

3.1

(−3.3, 10)

8.5

(1.7, 15.8)*

0.38

5.2

(−0.7, 11.4)

7.3

(−6.4, 23.0)

0.47

2.4

(−4.1, 9.4)

11.1

(4.2, 18.6)*

0.05°

5.6

(−0.3, 11.8)

7.2

(−6.5, 22.7)

0.69

 Mugwort

2.2

(−3.7, 8.6)

−2.1

(−12.4, 9.5)

0.78

1.3

(−4.5, 7.5)

−38.9

(−68.8, 19.7)

0.15

2.0

(−3.9, 8.3)

−4.6

(−15.1, 7.3)

0.62

1.6

(−4.2, 7.7)

−33.2

(−69.3, 45.4)

0.24

 Alternaria

0.0

(−3.1, 3.1)

− 4.7

(−9.1, 0.0)*

0.09°

−0.7

(−3.7, 2.4)

− 11.5

(−24.9, 4.2)

0.60

0.5

(−2.6, 3.7)

−6.1

(−10.6, −1.4)*

0.02°

−0.6

(−3.6, 2.5)

−8.0

(−20.8, 6.9)

0.25

 Cladosporium

1.9

(−6.3, 10.8)

−0.5

(−11.1, 11.2)

0.64

1.3

(−6.8, 10.1)

−3.2

(−23.8, 22.9)

0.68

1.7

(−6.5, 10.6)

−5.3

(−15.6, 6.4)

0.61

1.6

(−6.5, 10.5)

−4.9

(−22.3, 16.4)

0.50

 Taxon

O₃ ≤ P50

O₃ > P50

P interaction

O₃ ≤ P85

O₃ > P85

P interaction

NO₂ ≤ P50

NO₂ > P50

P interaction

NO₂ ≤ P85

NO₂ > P85

P interaction

 Alder

−0.6

(−3.5, 2.4)

1.1

(−2.0, 4.2)

0.81

0.3

(−2.2, 2.8)

−0.8

(−12.6, 12.5)

0.98

0.0

(−4.2, 4.3)

−0.2

(−3.0, 2.7)

0.95

0.7

(−1.9, 3.5)

−0.7

(−4.6, 3.4)

0.87

 Hazel

0.5

(−3.0, 4.0)

−3.2

(−8.1, 2.0)

0.29

0.9

(−2.1, 4.0)

−11.5

(−31.0, 13.6)

0.04°

−2.8

(−7.3, 2.0)

0.8

(−2.5, 4.2)

0.19

0.5

(−2.7, 3.7)

0.6

(−3.6, 4.9)

1.00

 Yew Cupressaceae

−6.1

(−12.3, 0.5)

−0.3

(−5.3, 4.9)

0.22

−2.2

(−6.7, 2.5)

−7.4

(−21.9, 9.8)

0.56

−1.3

(−7.5, 5.4)

−2.4

(−7.5, 3.0)

0.37

−1.0

(−5.9, 4.2)

−6.3

(−14.2, 2.2)

0.66

 Ash

−1.0

(−2.5, 0.4)

0.1

(−0.5, 0.7)

0.22

−0.3

(−1.0, 0.4)

1.3

(−0.2, 2.8)

0.32

0.1

(−0.5, 0.7)

−0.4

(−1.2, 0.4)

0.83

0.0

(−0.5, 0.6)

−2.7

(−5.4, 0.1)

0.33

 Hornbeam

1.6

(−0.3, 3.6)

0.8

(0.2, 1.3)*

0.12°

0.3

(−0.5, 1.0)

1.1

(0.3, 1.8)*

0.33

0.5

(−0.6, 1.7)

0.2

(−0.9, 1.4)

0.51

0.6

(0.1, 1.2)*

−6.5

(−14.7, 2.5)

0.25

 Birch

2.7

(−2.5, 8.2)

3.3

(1.1, 5.5)*

0.40

1.9

(− 0.3, 4.2)

7.0

(3.5, 10.7)*

0.05°

3.6

(0.8, 6.5)*

3.0

(0.7, 5.4)*

0.65

3.0

(0.9, 5.2)*

−1.5

(−7.7, 5.2)

0.22

 Oak

7.8

(−4.6, 21.8)

−6.2

(−12.1, 0.1)

0.16

−4.5

(−12.2, 3.7)

−5.8

(−12.0, 0.9)

0.96

−8.8

(−15.7, −1.5)*

−2.6

(−8.9, 4.2)

0.06°

−5.5

(−11.3, 0.8)

2.8

(−10.3, 17.9)

0.40

 Plantain

−3.7

(−26.5, 26.3)

6.3

(−11.6, 27.8)

0.85

7.2

(−10.5, 28.3)

−4.0

(−26.2, 24.9)

0.84

8.9

(−10.4, 32.3)

−0.5

(−19.6, 23.0)

0.48

3.0

(−13.3, 22.3)

18.3

(−27.9, 94.0)

0.96

 Grass

7.2

(−2.9, 18.3)

6.1

(0.2, 12.3)*

0.59

4.8

(−1.6, 11.7)

7.9

(1.1, 15.2)*

0.51

6.0

(0.0, 12.3)*

2.8

(−5.4, 11.7)

0.86

5.4

(−0.4, 11.7)

−8.0

(−53.3, 81.3)

0.4

 Mugwort

−3.8

(−13.5, 7.0)

1.6

(−4.4, 7.9)

0.35

2.8

(−3.4, 9.4)

−7.4

(−16.6, 2.9)

0.14°

1.3

(−4.6, 7.6)

0.2

(−10.2, 11.9)

0.68

1.3

(−4.5, 7.5)

−16.5

(−59.0, 70.2)

0.95

 Alternaria

−1.2

(−4.8, 2.5)

−0.8

(−4.0, 2.5)

0.40

−0.1

(−3.2, 3.1)

−3.3

(−8.0, 1.5)

0.63

−0.5

(−3.6, 2.7)

−2.6

(−7.1, 2.1)

0.41

−0.8

(−3.8, 2.3)

−6.8

(−20.4, 9.1)

0.57

 Cladosporium

0.1

(−9.6, 10.9)

1.5

(−6.9, 10.7)

0.63

1.6

(−6.8, 10.7)

0.3

(−9.7, 11.4)

1.00

1.8

(−6.3, 10.7)

−4.3

(−14.8, 7.5)

0.51

1.3

(−6.8, 10.1)

8.6

(−16.7, 41.6)

0.26