Table 1 Clinical and demographic characteristics of subjects included in the study (parents and children)

Children’s characteristics

 Sex (F/M), % (n)

48.8% (689) / 51.2% (723)

 Age (median 25°—75° quartile), years

10 (6 – 13)

 Blood group % (n)

Unknown:

49.3% (696)

A + :

17.3% (244)

A -:

1.7% (24)

B + :

5.5% (78)

B -:

0.8% (11)

AB + :

3.0% (43)

AB -:

0.5% (3)

0 + :

17.5% (247)

0 -:

4.5% (64)

 Comorbidities % (n)

None:

76.8% (1084)

Allergies:

15.3% (216)

Respiratory diseases:

2.5% (36)

Cardiac diseases:

1.6% (22)

Gastroenterological diseases:

1.6% (23)

Neurological diseases:

2.4% (34)

Nephrological diseases:

0.5% (7)

Endocrinological diseases:

1.4% (20)

Genetic diseases:

1% (14)

Immunodeficiencies:

0.1% (2)

Rheumatological diseases:

0.4 (5%)

 Weight (mean ± SD), Kg

38.5 (22.5 – 54.25)

 Height (mean ± SD), cm

141 (116 – 162)

Parent’s characteristics

 Educational level % (n)

Mother

Elementary schools:

1.4% (20)

Middle schools:

20.8% (294)

High schools:

54.4% (768)

Degree:

23.4% (330)

Father

Elementary schools:

2.1% (29)

Middle schools:

27.2% (384)

High schools:

52.9% (747)

Degree:

17.8% (252)

 Type of job % (n)

Mother

Housewife:

33.8% (477)

Teacher:

7.9% (112)

Doctor/nurse/health worker:

5.6% (79)

Employee:

22.4% (316)

Worker:

6% (85)

Freelancer:

6.5% (92)

Merchant:

4.1% (58)

Unemployed:

6.1% (86)

Father:

Teacher:

1.4% (20)

Doctor/nurse/health worker:

2.2% (31)

Employee:

23.3% (329)

Worker:

27.1 (383)

Freelancer:

15.1% (213)

Merchant:

5.9% (84)

Unemployed:

4.3% (61)

Military:

3.4% (48)

Police man:

0.8% (8)