Table 1 Baseline characteristics of participants

Caucasian ethnicity

12 (92.3)

26 (100)

0.333^†

Female sex

4 (30.7)

11 (42.3)

0.728^†

Mothers’ mean age, years

32.0

32.4

0.872^{^}

Fathers’ mean age, years

34.2

34.9

0.988^{^}

Highest education of parents

0.598^§

 Low (up to 12 years)

3 (23)

8 (30.7)

 Intermediate (>12 years, e.g. college)

5 (38.5)

6 (23)

 High (e.g. university)

5 (38.5)

12 (46.1)

Allergies in family

 Maternal atopy (A, AR or E)*

11 (84.6)

16 (61.5)

0.269^{^}

 Paternal atopy (A, AR or E)*

7 (53.8)

16 (61.5)

0.736^{^}

 Maternal food hypersensitivity

2 (15.4)

3 (11.5)

1.000^{^}

 Paternal food hypersensitivity

2 (15.4)

7 (26.9)

0.689^{^}

 Urban living environment

2 (15.4)

2 (7.7)

0.589^†

 Mean number of siblings

0.6

0.3

1.000^{^}

 Mean birth weight (g)

3538

3476

0.738^{^}

 Mean duration breastfeeding (months)

1.75

2.68

0.189^{^}

 Ever breastfed

7 (53.8)

22 (57.8)

0.742^†