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Table 1 Demographic characteristics of participants at 2 years of age

From: The impact of pre- and postnatal exposures on allergy related diseases in childhood: a controlled multicentre intervention study in primary health care

Characteristic Intervention cohort N = 1374 Control cohort N = 4780
  Mean (SD) Mean (SD)
Age mother at delivery (years) 29.8 (4.21) 29.3 (4.68)
Educationa mother (years) 15.8 (2.43) 15.5 (2.58)
Educationa father (years) 15.1 (2.77) 15.0 (2.97)
Birthweight (grams) 3601 (545) 3582 (594)
  n (%) n (%)
Boys 667 (49.3) 2389 (50.0)
One or more sibling 915 (67.4) 3265 (69.3)
Premature 162 (11.9) 671 (14.4)
Single mother 50 (3.8) 356 (7.7)
Breast fed ≥6 months 1053 (76.9) 3285 (69.3)
Smoking mother at start pregnancy 186 (13.8) 862 (18.6)
Smoking father at start pregnancy 205 (15.7) 917 (21.3)
Atopyb mother 652 (47.8) 1991 (42.4)
Atopyb father 578 (42.3) 1725 (36.8)
Atopy mother and father 304 (22.3) 865 (18.4)
Dog in dwelling 104 (7.6) 365 (7.7)
Cat in dwelling 150 (11.0) 397 (8.4)
Homeowner 1247 (91.4) 4118 (87.4)
  1. a Education data is based on a sample (Intervention cohort: n = 1062. Control cohort: n = 1242).
  2. b Defined as ever having had asthma, allergic rhinoconjunctivitis or AD.