Table 1 Descriptive characteristics of the participants

Age

 26–30

4

 31–35

6

 36–42

4

Marital status

 Married

5

 Cohabiting

7

 Single

2

Country of birth

 Norway

12

 Abroad

2

Place of residence

 Urban

6

 Semi-urban

3

 Rural

5

Educational level

 Lower than high school

1

 Certificate of apprenticeship

3

 College or university

10

Occupational status

 Employed, full time

12

 Employed, part time

1

 Unemployed

1

Parity

 1

7

 2

7

Pre-pregnancy body mass index

 Obesity class l (30- < 35 kg/m²)

4

 Obesity class ll (35- < 40 kg/m²)

5

 Obesity class lll (≥ 40 kg/m²)

5