Table 1 Descriptive table for the NINFEA population under study (N = 141)

Maternal pre-pregnancy BMI^a

22

3.0

Missing values

1

–

Maternal age at delivery (years)

35

4.1

Maternal education

 Low/medium (no university degree)

38

27%

 High (university degree or higher)

102

72%

 Missing values

1

1%

Parity

 First born

45

32%

 Non first born

92

65%

 Missing values

4

3%

Gestational duration (weeks)

 < 37 weeks

7

5%

 37+ weeks

134

95%

Child sex

 Female

61

43%

 Male

80

57%

Birthweight (grams)

3242

447.1

 Low (< 2500 g)

5

3.5%

 Medium (2500–4000 g)

128

90.8%

 High (> 4000 g)

8

5.7%

Small-for-gestational-age^b

 Yes

22

16%

 No

119

84%

Age at saliva sampling (months)

10.78

2.2