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Table 3 Baseline characteristics of LucKi participants born between July 2006 and December 2011

From: LucKi Birth Cohort Study: rationale and design

  N = 4.230
Sex (% male) 50.2 %
Gestational age at birtha  
 • < 37 weeks 5.8 %
 • 37–40 weeks 70.7 %
 • > 40 weeks 22.9 %
Maternal smoking during pregnancy 10.5 %
Breastfeeding (exclusive or combined)  
 • until age 3 months 35.4 %
 • until age 6 months 16.9 %
Parental history of atopyb 57.0 %
Number of older siblingsa  
 • 0 43.2 %
 • 1 38.3 %
 • > 1 11.9 %
Day care attendancec 55.2 %
Pet keepingd 51.4 %
Eczema prevalencee  
 Age 7 months 14.7 %
 Age 14 months 13.3 %
 Age 3 years 16.2 %
Wheeze prevalencee  
 Age 7 months 16.4 %
 Age 14 months 18.3 %
 Age 3 years 13.0 %
Overweight prevalencef  
 Age 3 years 7.6 %
  1. a Due to missing values, percentages do not add up to 100 %
  2. b Defined as mother or father ever having asthma, hay fever, or eczema
  3. c Defined as visiting day care weekly at age 7 months of age
  4. d Defined as ≥ 1 pets in the home at baseline (1–2 weeks of age)
  5. e The prevalence of eczema and wheeze is based on parentally reported symptoms through validated ISAAC questionnaires [10]
  6. f The prevalence of overweight was calculated with age- and sex-specific cut-off points for Body Mass Index of a widely used international standard [14]