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Table 3 Associations between traffic indicators and asthma symptoms and cough or phlegm

From: Respiratory symptoms in children living near busy roads and their relationship to vehicular traffic: results of an Italian multicenter study (SIDRIA 2)

 

Asthma symptoms

Cough or phlegm

 

n cases

(%)

OR*

95% CI

n cases

(%)

OR*

95% CI

Traffic density

        

   Absent

564

12.5

1.00

 

270

6.0

1.00

 

   Low

1,228

12.6

1.04

0.93–1.16

558

5.7

0.94

0.80–1.10

   Moderate

1,375

13.8

1.13

1.01–1.26

689

6.9

1.04

0.89–1.22

   High

795

14.6

1.17

1.03–1.33

475

8.7

1.24

1.04–1.49

Frequency cars transit

        

   Never

309

12.7

1.00

 

142

5.9

1.00

 

   Sometimes

1,147

12.1

0.95

0.83–1.10

517

5.5

0.90

0.74–1.10

   Frequently

1,399

13.6

1.06

0.93–1.22

679

6.6

1.02

0.84–1.26

   Continuously

1,108

14.9

1.16

1.00–1.33

656

8.8

1.32

1.08–1.63

Frequency trucks transit

        

   Never

1,412

12.3

1.00

 

652

5.7

1.00

 

   Sometimes

1,644

13.6

1.10

1.02–1.19

812

6.7

1.14

1.02–1.26

   Frequently

682

14.5

1.16

1.05–1.29

399

8.5

1.41

1.23–1.61

   Continuously

211

15.7

1.27

1.08–1.50

132

9.8

1.67

1.36–2.06

  1. * All ORs were adjusted for study centre, age, sex, parental asthma or allergies, parental education, passive smoke at home, indoor moulds, season, person filling the questionnaire, floor level of the apartment and change of residence.