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Table 5 Asthma and traffic at workplace address and during daily activities

From: Adult asthma and traffic exposure at residential address, workplace address, and self-reported daily time outdoor in traffic: A two-stage case-control study

The 2ndsurvey
WORKPLACE ADDRESS   n Asthma n (%) Asthma (OR)1 Asthma Symptoms. n (%) Asthma Symptoms (OR)1
Self-reported Heaviest road <50 m 0-1 cars/min 601 144 (24.0) 1.0 80 (13.4) 1.0
  2-5 cars/min 571 132 (23.1) 1.1 (0.80-1.5) 79 (14.0) 0.95 (0.66-1.4)
  6-10 cars/min 351 75 (21.4) 1.2 (0.79-1.7) 49 (14.0) 1.2 (0.76-1.8)
  > 10 cars/min 606 147 (24.3) 1.2 (0.73-1.9) 96 (15.9) 0.79 (0.42-1.5)
  Workplace varies 214 50 (23.4) 1.5 (0.93-2.7) 34 (16.0) 1.2 (0.72-2.1)
GIS Heaviest road <50 m no heavy road 161 36 (22.4) 1.0 21 (13.2) 1.0
  < 2 cars/min 267 61 (22.8) 1.0 (0.62-1.7) 34 (12.7) 1.1 (0.55-2.1)
  2-5 cars/min 673 149 (22.1) 0.91 (0.57-1.4) 94 (14.0) 1.2 (0.65-2.1)
  6-10 cars/min 407 83 (20.4) 0.92 (0.56-1.5) 45 (11.1) 1.1 (0.58-2.0)
  > 10 cars/min 326 78 (23.9) 1.0 (0.62-1.7) 51 (15.7) 1.4 (0.72-2.6)
GIS Heaviest road <100 m no heavy road 527 126 (23.9) 1.0 74 (14.1) 1.0
  < 2 cars/min 327 76 (23.2) 0.88 (0.61-1.3) 41 (12.5) 0.79 (0.49-1.3)
  2-5 cars/min 509 102 (20.0) 0.85 (0.61-1.2) 67 (13.2) 0.97 (0.65-1.5)
  6-10 cars/min 277 58 (20.9) 0.98 (0.66-1.5) 35 (12.7) 1.2 (0.74-1.9)
  > 10 cars/min 194 45 (23.2) 0.99 (0.63-1.5) 28 (14.5) 1.2 (0.72-2.1)
GIS Heaviest road <250 m no heavy road 161 36 (22.4) 1.0 21 (13.2) 1.0
  < 2 cars/min 267 61 (22.8) 1.0 (0.62-1.8) 34 (12.7) 1.1 (0.55-2.1)
  2-5 cars/min 673 149 (22.1) 0.91 (0.57-1.4) 94 (14.0) 1.2 (0.65-2.1)
  6-10 cars/min 407 83 (20.4) 0.92 (0.56-1.5) 45 (11.1) 1.1 (0.58-2.0)
  > 10 cars/min 326 78 (23.9) 1.0 (0.62-1.7) 51 (15.7) 1.4 (0.72-2.6)
GIS NOx (μg/m3) (250 × 250 m) 0-8 558 129 (23.1) 1.0 70 (12.6) 1.0
  8-11 163 34 (20.9) 0.88 (0.55-1.4) 23 (14.1) 1.1 (0.65-2.0)
  11-14 455 94 (20.7) 0.91 (0.65-1.3) 56 (12.4) 0.99 (0.64-1.5)
  14-19 227 48 (21.1) 1.0 (0.68-1.5) 27 (11.9) 1.2 (0.71-2.0)
  > 19 431 102 (23.7) 0.98 (0.70-1.4) 69 (16.1) 1.3 (0.88-2.0)
DAILY ACTIVITIES   n Asthma n (%) Asthma (OR) 1 Asthma symptoms n (%) Asthma Symptoms n (%)
Time outdoor in traffic/day 0-30 min 622 134 (21.5) 1.0 79 (12.8) 1.0
  30 min-1 h 1066 248 (23.3) 1.1 (0.8-1.4) 159 (15.1) 1.2 (0.83-1.7)
  1-2 h 715 194 (27.1) 1.1 (0.8-1.5) 121 (17.0) 1.4 (0.91-2.0)
  > 2 h 453 121 (26.7) 1.0 (0.7-1.4) 92 (20.4) 1.3 (0.83-2.0)
Commuting time to work < 15 min 881 211 (24.0) 1.0 117 (13.4) 1.0
  15-30 min 915 207 (22.6) 0.90 (0.70-1.1) 140 (15.4) 1.1 (0.84-1.5)
  30 min-1 h 408 99 (24.3) 1.0 (0.73-1.4) 60 (14.8) 1.2 (0.78-1.7)
  > 1 h 129 29 (22.5) 0.77 (0.45-1.33) 18 (14.2) 0.92 (0.47-1.8)
  1. 1Adjusted for age, sex, BMI, socio-economy, smoking, and occupational exposure. [OR(95%CI)]