Table 2

 Prevalence of symptoms of asthma, rhinitis, and eczema in children aged 6–7 years, and odds ratios for environmental factors that are relevant to infections (adjusted for dataset, sex, family size, paracetamol, and antibiotics use)

NumberCurrent wheezingAsthma everCurrent allergic rhinoconjunctivitisHay fever everEczema ever
%OR95% CI%OR95% CI%OR95% CI%OR95% CI%OR95% CI
*The “general population group” comprises the participants in the Wellington survey for 6–7 year olds. †The “childhood infections group” comprises children with notifiable infectious diseases reported to public health services and recorded on the EpiSurv database.
DatasetGeneral population*253924.31.0032.81.0012.01.0017.31.0039.91.00
Infections†158423.50.860.74 to 1.0031.90.860.75 to 0.9914.01.100.91 to 1.3318.21.020.87 to 1.2137.90.910.80 to 1.04
Paracetamol in the first yearNo43315.21.0018.21.009.71.0012.71.0031.91.00
Yes362825.11.381.04 to 1.8334.31.721.32 to 2.2313.00.970.68 to 1.3718.21.250.92 to 1.7040.31.271.02 to 1.58
Paracetamol in the past yearLess than once per month317220.61.0030.01.0011.01.0016.41.0038.81.00
At least once per month84036.22.101.78 to 2.4941.91.571.34 to 1.8419.01.771.43 to 2.1823.11.471.22 to 1.7841.71.050.90 to 1.23
Antibiotics in the first yearNo124316.11.0020.71.007.61.0013.31.0033.71.00
Yes268427.51.781.49 to 2.1438.02.101.79 to 2.4815.12.041.60 to 2.6119.91.521.25 to 1.8542.11.401.21 to 1.62
Older siblings:0121624.01.0034.11.0013.51.0020.21.0039.61.00
1144222.90.830.68 to 1.0030.00.780.66 to 0.9312.80.900.71 to 1.1417.40.730.59 to 0.9040.31.030.87 to 1.21
2+107724.70.920.75 to 1.1433.30.940.77 to 1.1311.00.780.59 to 1.0213.80.560.44 to 0.7137.30.910.76 to 1.09
Younger siblings:0155725.01.0031.71.0011.81.0018.01.0039.21.00
1158524.10.860.72 to 1.0332.70.960.82 to 1.1313.91.100.87 to 1.3818.20.820.67 to 1.0039.70.990.85 to 1.15
2+81620.30.660.51 to 0.8433.70.970.78 to 1.2112.00.900.66 to 1.2315.30.640.49 to 0.8539.80.990.81 to 1.22
Cat in the first yearNo218325.21.0034.31.0013.81.0019.31.0039.61.00
Yes188622.80.830.72 to 0.9730.40.790.69 to 0.9111.50.760.62 to 0.9215.80.740.63 to 0.8738.90.960.84 to 1.09
Cat now:No186324.71.0034.31.0013.81.0019.41.0039.61.00
Yes221323.60.910.78 to 1.0531.00.830.72 to 0.9511.80.790.65 to 0.9516.40.770.66 to 0.9139.00.970.85 to 1.10
Dog in the first yearNo293423.91.0031.91.0012.81.0017.61.0040.41.00
Yes113124.40.980.83 to 1.1634.01.050.90 to 1.2212.30.900.73 to 1.1117.90.980.81 to 1.1736.70.840.73 to 0.97
Dog now:No289623.11.0031.31.0012.51.0017.61.0040.51.00
Yes116826.41.130.96 to 1.3335.51.150.99 to 1.3313.10.980.80 to 1.2118.00.990.82 to 1.1836.40.830.72 to 0.96
Farm animals in the first yearNo855224.41.0033.01.0012.81.0017.81.0040.01.00
Yes51822.40.880.69 to 1.1129.30.830.67 to 1.0312.50.900.67 to 1.2117.00.940.73 to 1.2234.20.790.64 to 0.97
Mother had contact with farm animalsNo356624.31.0032.61.0012.61.0017.41.0039.91.00
Yes48622.20.890.69 to 1.1331.30.950.76 to 1.1913.20.980.73 to 1.3218.71.110.86 to 1.4435.00.830.67 to 1.02