Athens

n = 1000

%

Thessaloniki

n = 1023

%

p

All

n = 2023

%

Sex (male)

46.1

49.7

0.11

47.9

Preterm infant

15.5

16.3

0.69

15.9

Both parents with academic education

22.8

57.0

<0.01

39.9

Mother smoking habits

32.6

29.8

0.19

31.2

Maternal history of eczema

9.7

10.2

0.76

9.9

Paternal history of eczema

7.3

6.6

0.54

6.9

Breast feeding

78.6

74.7

0.03

76.6

Attending nursery school before the age of 2 y

13

10.8

0.13

11.9

Bedroom sharing

78.4

78.1

0.91

78.3

Pets ownership

8.3

12.2

0.04

10.3

Farm animals exposure

1.6

2.4

0.20

2

Air-condition in the house

11.3

7.2

<0.01

9.2

Central heating in the house

76.6

40.4

<0.01

58.2

Dampness in the house

13.2

8.4

<0.01

10.8

Visible moulds in the house

7.8

5

<0.01

6.4

Fitted carpets in child bedroom

57.9

29.3

<0.01

43.5

Use of foam pillows

14.1

11.9

0.14

13

Use of synthetic pillows

14.2

14

0.89

14.1

Use of feather pillows

25.8

29.2

0.08

27.5

Use of synthetic quilts

22.7

17.1

0.02

19.9

Use of feather quilts

13.5

9

0.02

11.2

Use of blankets

68.2

75.8

<0.01

72