TABLE 1.

Characteristics of Norwegian women from the LiN study collected during wave one (n = 1,004)

Characteristics of pregnant women a	(n = 1,004)
Age (years)	30.2 ± 4.8
BMI (kg/m2) b	22.8 (20.8–25.3)
<18.5	31 [3.1]
18.5–24.9	554 [55.2]
≥25	216 [21.5]
Education level
Primary and secondary school	32 [3.2]
High school	200 [19.9]
<4 years of university	360 [35.9]
≥4 years of university	412 [41.0]
Work situation
Work full time	770 [76.7]
Work part time c	136 [13.5]
Student d	60 [6.0]
Unemployed	30 [3.0]
Geographic region
Mid‐Norway	275 [27.4]
North Norway	144 [14.3]
Western Norway	218 [21.7]
Eastern Norway	367 [36.6]
Use medication for thyroid disorder	33 [3.3]
Use of iodine‐containing supplements	344 [34.3]
Number of live births	0.6 ± 0.8
Use tobacco daily	75 [7.5]

Values are presented as mean ± SD, median (p25–p75) and n [%]. Missing data: 203 missing from women's BMI and eight missing from work situation.

^aBackground characteristics were collected during wave 1.

^bBMI before pregnancy.

^cSix percent (n = 60) reporting a combination of work and studies.

^dPart‐time or full‐time student.