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Table 1 Participants characteristics, outcomes and levels of exposure (a) among all participants, (b) among those whose addresses were and were not geo-coded successfully and (c) among those whose addresses were geocoded at house versus at street level only

From: Residential exposure to motor vehicle emissions and the risk of wheezing among 7-8 year-old schoolchildren: a city-wide cross-sectional study in Nicosia, Cyprus

  A. All B. By geocoding success C. By level of accuracy of geocoding
  (N = 1,917) Successful
(N = 1,735)
Unsuccessful
(N = 182)
P-value1 House
(N = 1,336)
Street
(N = 399)
P-value1
Characteristics        
Male 48.9% 49.1% 47.8% 0.75 49.5% 47.6% 0.52
Born in Cyprus 91.9% 92.4% 87.3% 0.02 92.6% 91.7% 0.54
At least one parent not Cypriot 16.2% 12.5% 17.7% 0.05 12.1% 13.8% 0.37
Birth weight (mean in kg) 3.24 3.24 3.24 0.98 3.24 3.25 0.62
At least one parent smoker 46.4% 46.7% 45.1% 0.67 47.0% 45.7% 0.66
Smoking at least a pack/day 33.5% 33.5% 34.1% 0.69 34.1% 31.7% 0.63
Smoking during pregnancy 2.5% 2.5% 2.8% 0.80 2.4% 2.5% 0.90
Cat at home 3.4% 3.6% 2.2% 0.33 3.8% 3.1% 0.48
Symptoms        
Currently wheezing 8.8% 9.3% 7.3% 0.37 9.6% 8.3% 0.43
Ever having wheezed 21.9% 22.9% 20.1% 0.40 23.2% 21.7% 0.53
Ever had asthma diagnosis 12.9% 13.4% 13.0% 0.87 13.5% 13.2% 0.87
Personal history of eczema 8.2% 8.9% 5.1% 0.09 8.7% 9.4% 0.70
Personal history of hay fever 3.9% 4.5% 1.7% 0.10 4.6% 3.7% 0.50
Family history of atopy 29.3% 31.6% 26.9% 0.20 32.1% 30.2% 0.51
Exposure (mean)        
Distance to nearest main road (metres)   176.4    177.1 174.4 0.84
PM at nearest (kg per km per day)   0.22    0.26 0.21 0.15
NOx at nearest (kg per km per day)   4.60    4.52 5.10 0.23
Cumulative PM (kg per km per day) within 50 m   0.40    0.39 0.42 0.16
  within 100 m   0.54    0.54 0.54 0.83
  within 150 m   0.78    0.80 0.71 0.12
Cumulative NOx
(kg per km per day)
within 50 m   6.60    6.52 6.88 0.23
  within 100 m   9.46    9.51 9.29 0.73
  within 150 m   14.00    14.42 12.67 0.12
  1. 1p-values of χ2-test for independence or t-test for differences in means as appropriate.