Skip to main content

Advertisement

Table 6 Total traffic exposure.

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
COMBINED EXPOSURE n Asthma, n (%) Asthma, n (%) Asthma OR1 Asthma symptoms, n (%) Asthma symptoms (OR)1
Total exposure2 C = 30 1st 298 72(24.2%) 1.00 41(13.8%) 1.00
  2nd 298 68(22.8%) 0.90 (0.61-1.35) 32(10.8%) 0.70(0.41-1.18)
  3rd 297 59(19.9%) 0.76 (0.51-1.15) 43(14.5%) 1.09(0.67-1.77)
  4th 298 65(21.8%) 0.87 (0.58-1.31) 41(13.8%) 1.09(0.66-1.79)
  5th 297 70(23.6%) 0.96 (0.64-1.44) 48(16.2%) 1.28(0.79-2.08)
Total exposure2 C = 300 1st 298 67(22.5%) 1.00 35(11.8%) 1.00
  2nd 298 67/22.5%) 1.02 (0.68-1.53) 35(11.8%) 1.06(0.63-1.79)
  3rd 297 69(23.2%) 1.00 (0.66-1.50) 48(16.2%) 1.50(0.91-2.48)
  4th 298 65(21.8%) 0.88 (0.58-1.34) 45(15.2%) 1.33(0.79-2.21)
  5th 297 66(22.2%) 0.88 (0.58-1.33) 42(14.1%) 1.18(0.71-1.99)
Residential + workplace Address2 1st 298 73(24.5%) 1.00 41(13.8%) 1.00
  2nd 298 69(23.2%) 0.91 (0.61-1.35) 36(12.1%) 0.89(0.53-1.47)
  3rd 297 54(18.2%) 0.64 (0.42-0.97) 36(12.2%) 0.87(0.52-1.44)
  4th 298 69(23.2%) 0.98 (0.66-1.46) 46(15.5%) 1.31(0.81-2.12)
  5th 297 69(23.2%) 0.94 (0.63-1.41) 46(15.5%) 1.27(0.78-2.07)
Workplace Address 1st 298 74(24.8%) 1.00 40(13.5%) 1.00
  2nd 298 64(21.5%) 0.81 (0.54-1.22) 41(13.8%) 1.12(0.68-1.85)
  3rd 297 66(22.2%) 0.87 (0.58-1.31) 41(13.8%) 1.11(0.67-1.85)
  4th 298 67/22.5%) 0.92 (0.62-1.37) 40(13.5%) 1.14(0.70-1.88)
  5th 297 63(21.2%) 0.77 (0.51-1.16) 43(14.6%) 1.19(0.72-1.96)
Residential Address 1st 298 71(23.8%) 1.00 41(13.8%) 1.00
  2nd 298 70(23.5%) 0.90 (0.60-1.34) 35(11.8%) 0.80(0.48-1.33)
  3rd 297 58(19.5%) 0.78 (0.52-1.18) 41(13.9%) 1.08(0.66-1.75)
  4th 298 66(22.1%) 0.91 (0.60-1.36) 40(13.4%) 1.09(0.66-1.80)
  5th 297 69(23.2%) 0.96 (0.64-1.44) 48(16.2%) 1.31(0.81-2.13)
  1. 1Adjusted for age, sex, BMI, socio-economy, smoking, and occupational exposure. [OR(95%CI)]. 2 Total exposure assessment (residential address + workplace address + time in traffic) is explained in methods section. The estimate based on only residential + workplace address is also time-weighted. C is the exposure dose time in traffic is hypothesized to contribute.
  2. The association between traffic and asthma is not stronger when combining total exposure compared to using only residential exposure. Using quantiles, i.e holding the number of individuals fixed in each category, the changes in estimates reflects individuals moving between the low/high categories depending on what exposures (residential address, workplace address, time outdoor in traffic) that are combined to estimate high vs low traffic exposure.