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Table 6 Prevalence of self-reported hayfever along with crude and adjusted odd ratios, by risk or protective factors

From: Allergic rhinitis, rhinoconjunctivitis and hayfever symptoms among children are associated with frequency of truck traffic near residences: a cross sectional study

Variable Totala Hayfever (%) Crude OR (95 % CI) p Adjusted OR (95 % CI)b p
Frequency of trucks passing near homes on weekdays
Never 563 32.7 1   1  
Seldom 1033 38.7 1.22 (0.98–1.51) 0.074 1.12 (0.87–1.43) 0.362
Frequently through the day 580 37.9 1.28 (1.00–1.63) 0.047 1.19 (0.90–1.57) 0.203
Almost all day 1212 38.2 1.34 (1.08–1.66) 0.007 1.23 (0.96–1.57) 0.087
Sex of child
Female 1790 43.2 1   1  
Male 1634 31.3 0.59 (0.51–0.68) 0.000 0.56 (0.47–0.65) 0.000
Vigorous physical activity per week
Never or occasionally 984 30.7 1   1  
Once or twice per week 1417 40.2 1.51 (1.27–1.80) 0.000 1.38 (1.44–1.68) 0.001
Three or more times per week 983 40.5 1.48 (1.23–1.79) 0.000 1.52 (1.23–1.88) 0.000
Residential fuel heating type most frequently
Electricity 2041 35.8 1    
Gas 426 43.0 1.30 (1.05–1.61) 0.015 1.20 (0.95–1.52) 0.121
Paraffin 631 35.8 1.15 (0.94–1.40) 0.160 1.11 (0.89–1.39) 0.330
Open fire 270 43.3 1.46 (1.12–1.89) 0.004 1.51 (1.13–2.02) 0.005
ETS exposure at home
No 1460 36.1 1   1  
Yes 1452 40.1 1.23 (1.05–1.43) 0.007 1.20 (1.02–1.40) 0.022
  1. aTotals for each risk factor are different due to difference in missing values
  2. bModel adjusted for all the variables in this table