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Table 1 Distribution (%) of asthma related health outcomes in 5-year-old children (n = 981) according to child, maternal and upbringing characteristics in the Odense Child Cohort

From: Association between prenatal exposure to perfluoroalkyl substances and asthma in 5-year-old children in the Odense Child Cohort

   WheezeSelf-reported asthmaDoctor-diagnosed asthma
n%Yes % 19.0 (n = 186)No % 81.0 (n = 795)Yes % 2.6 (n = 25)No % 97.4 (n = 956)Yes % 4.5 (n = 44)No % 95.5 (n = 937)
Sex
 Boy51152.164.5 *49.2 *52.052.186.4 *50.5 *
 Girl47047.935.8 *50.8 *48.047.913.6 *49.5 *
Birthweight (grams)
  < 2500252.62.22.64.02.52.32.5
 2500–450092894.694.194.896.094.690.994.8
  > 4500282.83.72.60.02.96.82.7
Preterm (< 37 weeks)
 Yes373.84.33.64.03.86.83.6
 No94496.295.796.496.096.293.296.4
Breastfeedinga
  < 4 weeks8710.812.110.530.0 *10.3 *8.610.9
 4–19 weeks13216.417.816.010.0 *16.5 *14.316.5
  > 19 weeks58772.870.173.560.0 *73.2 *77.172.6
Age (years)
  < 2825025.531.224.136.025.234.125.1
 28–3449250.246.251.152.050.147.750.3
  > 3423924.322.624.812.024.718.224.6
BMI (kg/m2)
  < 2010911.111.3 *11.1 *8.011.211.411.1
 20–2554355.446.2 *57.5 *52.055.445.555.8
  > 2532933.542.5 *31.4 *40.033.443.233.1
Parity
 Nulliparous56557.656.558.068.057.350.058.0
 Multiparous41642.443.542.032.042.750.042.0
Smoking
 Yes394.05.43.74.04.011.4 *3.6 *
 No94296.094.696.396.096.088.6 *96.4 *
Education levelb
 Lower24425.233.7 *23.2 *32.025.032.624.8
 Intermediate50251.744.8 *53.4 *40.052.053.551.7
 Higher22423.121.5 *23.4 *28.023.013.923.5
Family asthma
 Yes15615.925.3 *13.7 *36.0 *15.4 *36.4 *14.9 *
 No82584.174.7 *86.3 *64.0 *84.6 *63.6 *85.1 *
Doctor-diagnosed atopic dermatitis
 Yes606.110.2 *5.2 *20.0 *5.8 *11.45.9
 No92193.989.8 *94.8 *80.0 *94.2 *88.694.1
Doctor-diagnosed rhinitis
 Yes202.04.3 *1.5 *0.02.19.1 *1.7 *
 No96198.095.7 *98.5 *100.097.990.9 *98.3 *
Smoking in household
 Yes14114.417.213.712.014.418.214.2
 No84085.682.886.388.085.681.885.8
Pets in householdc
 Indoor32735.541.633.940.035.347.734.8
 Outdoor505.44.35.74.05.52.35.6
 No54559.154.160.456.059.250.059.6
  1. a) Missing (n = 175). b) Missing (n = 11). c) Missing (n = 59)
  2. * p < 0.05 (Chi2 test)